// SPDX-License-Identifier: GPL-2.0
/*
 * R9A06G032 clock driver
 *
 * Copyright (C) 2018 Renesas Electronics Europe Limited
 *
 * Michel Pollet <michel.pollet@bp.renesas.com>, <buserror@gmail.com>
 */

#include <clk-uclass.h>
#include <dm.h>
#include <dm/device_compat.h>
#include <regmap.h>
#include <syscon.h>
#include <linux/bitops.h>
#include <linux/clk-provider.h>
#include <linux/delay.h>
#include <asm/io.h>

#include <dt-bindings/clock/r9a06g032-sysctrl.h>

/**
 * struct regbit - describe one bit in a register
 * @reg: offset of register relative to base address,
 *          expressed in units of 32-bit words (not bytes),
 * @bit: which bit (0 to 31) in the register
 *
 * This structure is used to compactly encode the location
 * of a single bit in a register. Five bits are needed to
 * encode the bit number. With uint16_t data type, this
 * leaves 11 bits to encode a register offset up to 2047.
 *
 * Since registers are aligned on 32-bit boundaries, the
 * offset will be specified in 32-bit words rather than bytes.
 * This allows encoding an offset up to 0x1FFC (8188) bytes.
 *
 * Helper macro RB() takes care of converting the register
 * offset from bytes to 32-bit words.
 */
struct regbit {
	u16 reg:11;
	u16 bit:5;
};

#define RB(_reg, _bit) ((struct regbit) { \
	.reg = (_reg) / 4, \
	.bit = (_bit) \
})

/**
 * struct r9a06g032_gate - clock-related control bits
 * @gate:   clock enable/disable
 * @reset:  clock module reset (active low)
 * @ready:  enables NoC forwarding of read/write requests to device,
 *          (eg. device is ready to handle read/write requests)
 * @midle:  request to idle the NoC interconnect
 *
 * Each of these fields describes a single bit in a register,
 * which controls some aspect of clock gating. The @gate field
 * is mandatory, this one enables/disables the clock. The
 * other fields are optional, with zero indicating "not used".
 *
 * In most cases there is a @reset bit which needs to be
 * de-asserted to bring the module out of reset.
 *
 * Modules may also need to signal when the are @ready to
 * handle requests (read/writes) from the NoC interconnect.
 *
 * Similarly, the @midle bit is used to idle the master.
 */
struct r9a06g032_gate {
	struct regbit gate, reset, ready, midle;
	/* Unused fields omitted to save space */
	/* struct regbit scon, mirack, mistat */;
};

enum gate_type {
	K_GATE = 0,	/* gate which enable/disable */
	K_FFC,		/* fixed factor clock */
	K_DIV,		/* divisor */
	K_BITSEL,	/* special for UARTs */
	K_DUALGATE	/* special for UARTs */
};

/**
 * struct r9a06g032_clkdesc - describe a single clock
 * @name:      string describing this clock
 * @managed:   boolean indicating if this clock should be
 *             started/stopped as part of power management
 *             (not used in u-boot)
 * @type:      see enum @gate_type
 * @index:     the ID of this clock element
 * @source:    the ID+1 of the parent clock element.
 *             Root clock uses ID of ~0 (PARENT_ID);
 * @gate:      clock enable/disable
 * @div_min:   smallest permitted clock divider
 * @div_max:   largest permitted clock divider
 * @reg:       clock divider register offset, in 32-bit words
 * @div_table: optional list of fixed clock divider values;
 *             must be in ascending order, zero for unused
 * @div:       divisor for fixed-factor clock
 * @mul:       multiplier for fixed-factor clock
 * @group:     UART group, 0=UART0/1/2, 1=UART3/4/5/6/7
 * @sel:       select either g1/r1 or g2/r2 as clock source
 * @g1:        1st source gate (clock enable/disable)
 * @r1:        1st source reset (module reset)
 * @g2:        2nd source gate (clock enable/disable)
 * @r2:        2nd source reset (module reset)
 *
 * Describes a single element in the clock tree hierarchy.
 * As there are quite a large number of clock elements, this
 * structure is packed tightly to conserve space.
 */
struct r9a06g032_clkdesc {
	const char *name;
	uint32_t managed:1;
	enum gate_type type:3;
	uint32_t index:8;
	uint32_t source:8; /* source index + 1 (0 == none) */
	union {
		/* type = K_GATE */
		struct r9a06g032_gate gate;
		/* type = K_DIV  */
		struct {
			unsigned int div_min:10, div_max:10, reg:10;
			u16 div_table[4];
		};
		/* type = K_FFC */
		struct {
			u16 div, mul;
		};
		/* type = K_DUALGATE */
		struct {
			uint16_t group:1;
			struct regbit sel, g1, r1, g2, r2;
		} dual;
	};
};

/*
 * The last three arguments are not currently used,
 * but are kept in the r9a06g032_clocks table below.
 */
#define I_GATE(_clk, _rst, _rdy, _midle, _scon, _mirack, _mistat) { \
	.gate = _clk, \
	.reset = _rst, \
	.ready = _rdy, \
	.midle = _midle, \
	/* .scon = _scon, */ \
	/* .mirack = _mirack, */ \
	/* .mistat = _mistat */ \
}
#define D_GATE(_idx, _n, _src, ...) { \
	.type = K_GATE, \
	.index = R9A06G032_##_idx, \
	.source = 1 + R9A06G032_##_src, \
	.name = _n, \
	.gate = I_GATE(__VA_ARGS__) \
}
#define D_MODULE(_idx, _n, _src, ...) { \
	.type = K_GATE, \
	.index = R9A06G032_##_idx, \
	.source = 1 + R9A06G032_##_src, \
	.name = _n, \
	.managed = 1, \
	.gate = I_GATE(__VA_ARGS__) \
}
#define D_ROOT(_idx, _n, _mul, _div) { \
	.type = K_FFC, \
	.index = R9A06G032_##_idx, \
	.name = _n, \
	.div = _div, \
	.mul = _mul \
}
#define D_FFC(_idx, _n, _src, _div) { \
	.type = K_FFC, \
	.index = R9A06G032_##_idx, \
	.source = 1 + R9A06G032_##_src, \
	.name = _n, \
	.div = _div, \
	.mul = 1 \
}
#define D_DIV(_idx, _n, _src, _reg, _min, _max, ...) { \
	.type = K_DIV, \
	.index = R9A06G032_##_idx, \
	.source = 1 + R9A06G032_##_src, \
	.name = _n, \
	.reg = _reg, \
	.div_min = _min, \
	.div_max = _max, \
	.div_table = { __VA_ARGS__ } \
}
#define D_UGATE(_idx, _n, _src, _g, _g1, _r1, _g2, _r2) { \
	.type = K_DUALGATE, \
	.index = R9A06G032_##_idx, \
	.source = 1 + R9A06G032_##_src, \
	.name = _n, \
	.dual = { \
		.group = _g, \
		.g1 = _g1, \
		.r1 = _r1, \
		.g2 = _g2, \
		.r2 = _r2 \
	}, \
}

/* Internal clock IDs */
#define R9A06G032_CLKOUT		0
#define R9A06G032_CLKOUT_D10		2
#define R9A06G032_CLKOUT_D16		3
#define R9A06G032_CLKOUT_D160		4
#define R9A06G032_CLKOUT_D1OR2		5
#define R9A06G032_CLKOUT_D20		6
#define R9A06G032_CLKOUT_D40		7
#define R9A06G032_CLKOUT_D5		8
#define R9A06G032_CLKOUT_D8		9
#define R9A06G032_DIV_ADC		10
#define R9A06G032_DIV_I2C		11
#define R9A06G032_DIV_NAND		12
#define R9A06G032_DIV_P1_PG		13
#define R9A06G032_DIV_P2_PG		14
#define R9A06G032_DIV_P3_PG		15
#define R9A06G032_DIV_P4_PG		16
#define R9A06G032_DIV_P5_PG		17
#define R9A06G032_DIV_P6_PG		18
#define R9A06G032_DIV_QSPI0		19
#define R9A06G032_DIV_QSPI1		20
#define R9A06G032_DIV_REF_SYNC		21
#define R9A06G032_DIV_SDIO0		22
#define R9A06G032_DIV_SDIO1		23
#define R9A06G032_DIV_SWITCH		24
#define R9A06G032_DIV_UART		25
#define R9A06G032_DIV_MOTOR		64
#define R9A06G032_CLK_DDRPHY_PLLCLK_D4	78
#define R9A06G032_CLK_ECAT100_D4	79
#define R9A06G032_CLK_HSR100_D2		80
#define R9A06G032_CLK_REF_SYNC_D4	81
#define R9A06G032_CLK_REF_SYNC_D8	82
#define R9A06G032_CLK_SERCOS100_D2	83
#define R9A06G032_DIV_CA7		84

#define R9A06G032_UART_GROUP_012	154
#define R9A06G032_UART_GROUP_34567	155

#define R9A06G032_CLOCK_COUNT		(R9A06G032_UART_GROUP_34567 + 1)

static const struct r9a06g032_clkdesc r9a06g032_clocks[] = {
	D_ROOT(CLKOUT, "clkout", 25, 1),
	D_ROOT(CLK_PLL_USB, "clk_pll_usb", 12, 10),
	D_FFC(CLKOUT_D10, "clkout_d10", CLKOUT, 10),
	D_FFC(CLKOUT_D16, "clkout_d16", CLKOUT, 16),
	D_FFC(CLKOUT_D160, "clkout_d160", CLKOUT, 160),
	D_DIV(CLKOUT_D1OR2, "clkout_d1or2", CLKOUT, 0, 1, 2),
	D_FFC(CLKOUT_D20, "clkout_d20", CLKOUT, 20),
	D_FFC(CLKOUT_D40, "clkout_d40", CLKOUT, 40),
	D_FFC(CLKOUT_D5, "clkout_d5", CLKOUT, 5),
	D_FFC(CLKOUT_D8, "clkout_d8", CLKOUT, 8),
	D_DIV(DIV_ADC, "div_adc", CLKOUT, 77, 50, 250),
	D_DIV(DIV_I2C, "div_i2c", CLKOUT, 78, 12, 16),
	D_DIV(DIV_NAND, "div_nand", CLKOUT, 82, 12, 32),
	D_DIV(DIV_P1_PG, "div_p1_pg", CLKOUT, 68, 12, 200),
	D_DIV(DIV_P2_PG, "div_p2_pg", CLKOUT, 62, 12, 128),
	D_DIV(DIV_P3_PG, "div_p3_pg", CLKOUT, 64, 8, 128),
	D_DIV(DIV_P4_PG, "div_p4_pg", CLKOUT, 66, 8, 128),
	D_DIV(DIV_P5_PG, "div_p5_pg", CLKOUT, 71, 10, 40),
	D_DIV(DIV_P6_PG, "div_p6_pg", CLKOUT, 18, 12, 64),
	D_DIV(DIV_QSPI0, "div_qspi0", CLKOUT, 73, 3, 7),
	D_DIV(DIV_QSPI1, "div_qspi1", CLKOUT, 25, 3, 7),
	D_DIV(DIV_REF_SYNC, "div_ref_sync", CLKOUT, 56, 2, 16, 2, 4, 8, 16),
	D_DIV(DIV_SDIO0, "div_sdio0", CLKOUT, 74, 20, 128),
	D_DIV(DIV_SDIO1, "div_sdio1", CLKOUT, 75, 20, 128),
	D_DIV(DIV_SWITCH, "div_switch", CLKOUT, 37, 5, 40),
	D_DIV(DIV_UART, "div_uart", CLKOUT, 79, 12, 128),
	D_GATE(CLK_25_PG4, "clk_25_pg4", CLKOUT_D40, RB(0xe8, 9),
	       RB(0xe8, 10), RB(0xe8, 11), RB(0x00, 0),
	       RB(0x15c, 3), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_25_PG5, "clk_25_pg5", CLKOUT_D40, RB(0xe8, 12),
	       RB(0xe8, 13), RB(0xe8, 14), RB(0x00, 0),
	       RB(0x15c, 4), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_25_PG6, "clk_25_pg6", CLKOUT_D40, RB(0xe8, 15),
	       RB(0xe8, 16), RB(0xe8, 17), RB(0x00, 0),
	       RB(0x15c, 5), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_25_PG7, "clk_25_pg7", CLKOUT_D40, RB(0xe8, 18),
	       RB(0xe8, 19), RB(0xe8, 20), RB(0x00, 0),
	       RB(0x15c, 6), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_25_PG8, "clk_25_pg8", CLKOUT_D40, RB(0xe8, 21),
	       RB(0xe8, 22), RB(0xe8, 23), RB(0x00, 0),
	       RB(0x15c, 7), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_ADC, "clk_adc", DIV_ADC, RB(0x3c, 10),
	       RB(0x3c, 11), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_ECAT100, "clk_ecat100", CLKOUT_D10, RB(0x80, 5),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_HSR100, "clk_hsr100", CLKOUT_D10, RB(0x90, 3),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_I2C0, "clk_i2c0", DIV_I2C, RB(0x3c, 6),
	       RB(0x3c, 7), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_I2C1, "clk_i2c1", DIV_I2C, RB(0x3c, 8),
	       RB(0x3c, 9), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_MII_REF, "clk_mii_ref", CLKOUT_D40, RB(0x68, 2),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_NAND, "clk_nand", DIV_NAND, RB(0x50, 4),
	       RB(0x50, 5), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_NOUSBP2_PG6, "clk_nousbp2_pg6", DIV_P2_PG, RB(0xec, 20),
	       RB(0xec, 21), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_P1_PG2, "clk_p1_pg2", DIV_P1_PG, RB(0x10c, 2),
	       RB(0x10c, 3), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_P1_PG3, "clk_p1_pg3", DIV_P1_PG, RB(0x10c, 4),
	       RB(0x10c, 5), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_P1_PG4, "clk_p1_pg4", DIV_P1_PG, RB(0x10c, 6),
	       RB(0x10c, 7), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_P4_PG3, "clk_p4_pg3", DIV_P4_PG, RB(0x104, 4),
	       RB(0x104, 5), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_P4_PG4, "clk_p4_pg4", DIV_P4_PG, RB(0x104, 6),
	       RB(0x104, 7), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_P6_PG1, "clk_p6_pg1", DIV_P6_PG, RB(0x114, 0),
	       RB(0x114, 1), RB(0x114, 2), RB(0x00, 0),
	       RB(0x16c, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_P6_PG2, "clk_p6_pg2", DIV_P6_PG, RB(0x114, 3),
	       RB(0x114, 4), RB(0x114, 5), RB(0x00, 0),
	       RB(0x16c, 1), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_P6_PG3, "clk_p6_pg3", DIV_P6_PG, RB(0x114, 6),
	       RB(0x114, 7), RB(0x114, 8), RB(0x00, 0),
	       RB(0x16c, 2), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_P6_PG4, "clk_p6_pg4", DIV_P6_PG, RB(0x114, 9),
	       RB(0x114, 10), RB(0x114, 11), RB(0x00, 0),
	       RB(0x16c, 3), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(CLK_PCI_USB, "clk_pci_usb", CLKOUT_D40, RB(0x1c, 6),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_QSPI0, "clk_qspi0", DIV_QSPI0, RB(0x54, 4),
	       RB(0x54, 5), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_QSPI1, "clk_qspi1", DIV_QSPI1, RB(0x90, 4),
	       RB(0x90, 5), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_RGMII_REF, "clk_rgmii_ref", CLKOUT_D8, RB(0x68, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_RMII_REF, "clk_rmii_ref", CLKOUT_D20, RB(0x68, 1),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_SDIO0, "clk_sdio0", DIV_SDIO0, RB(0x0c, 4),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_SDIO1, "clk_sdio1", DIV_SDIO1, RB(0xc8, 4),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_SERCOS100, "clk_sercos100", CLKOUT_D10, RB(0x84, 5),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_SLCD, "clk_slcd", DIV_P1_PG, RB(0x10c, 0),
	       RB(0x10c, 1), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_SPI0, "clk_spi0", DIV_P3_PG, RB(0xfc, 0),
	       RB(0xfc, 1), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_SPI1, "clk_spi1", DIV_P3_PG, RB(0xfc, 2),
	       RB(0xfc, 3), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_SPI2, "clk_spi2", DIV_P3_PG, RB(0xfc, 4),
	       RB(0xfc, 5), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_SPI3, "clk_spi3", DIV_P3_PG, RB(0xfc, 6),
	       RB(0xfc, 7), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_SPI4, "clk_spi4", DIV_P4_PG, RB(0x104, 0),
	       RB(0x104, 1), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_SPI5, "clk_spi5", DIV_P4_PG, RB(0x104, 2),
	       RB(0x104, 3), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_SWITCH, "clk_switch", DIV_SWITCH, RB(0x130, 2),
	       RB(0x130, 3), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_DIV(DIV_MOTOR, "div_motor", CLKOUT_D5, 84, 2, 8),
	D_MODULE(HCLK_ECAT125, "hclk_ecat125", CLKOUT_D8, RB(0x80, 0),
		 RB(0x80, 1), RB(0x00, 0), RB(0x80, 2),
		 RB(0x00, 0), RB(0x88, 0), RB(0x88, 1)),
	D_MODULE(HCLK_PINCONFIG, "hclk_pinconfig", CLKOUT_D40, RB(0xe8, 0),
		 RB(0xe8, 1), RB(0xe8, 2), RB(0x00, 0),
		 RB(0x15c, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_SERCOS, "hclk_sercos", CLKOUT_D10, RB(0x84, 0),
		 RB(0x84, 2), RB(0x00, 0), RB(0x84, 1),
		 RB(0x00, 0), RB(0x8c, 0), RB(0x8c, 1)),
	D_MODULE(HCLK_SGPIO2, "hclk_sgpio2", DIV_P5_PG, RB(0x118, 3),
		 RB(0x118, 4), RB(0x118, 5), RB(0x00, 0),
		 RB(0x168, 1), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_SGPIO3, "hclk_sgpio3", DIV_P5_PG, RB(0x118, 6),
		 RB(0x118, 7), RB(0x118, 8), RB(0x00, 0),
		 RB(0x168, 2), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_SGPIO4, "hclk_sgpio4", DIV_P5_PG, RB(0x118, 9),
		 RB(0x118, 10), RB(0x118, 11), RB(0x00, 0),
		 RB(0x168, 3), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_TIMER0, "hclk_timer0", CLKOUT_D40, RB(0xe8, 3),
		 RB(0xe8, 4), RB(0xe8, 5), RB(0x00, 0),
		 RB(0x15c, 1), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_TIMER1, "hclk_timer1", CLKOUT_D40, RB(0xe8, 6),
		 RB(0xe8, 7), RB(0xe8, 8), RB(0x00, 0),
		 RB(0x15c, 2), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_USBF, "hclk_usbf", CLKOUT_D8, RB(0x1c, 3),
		 RB(0x00, 0), RB(0x00, 0), RB(0x1c, 4),
		 RB(0x00, 0), RB(0x20, 2), RB(0x20, 3)),
	D_MODULE(HCLK_USBH, "hclk_usbh", CLKOUT_D8, RB(0x1c, 0),
		 RB(0x1c, 1), RB(0x00, 0), RB(0x1c, 2),
		 RB(0x00, 0), RB(0x20, 0), RB(0x20, 1)),
	D_MODULE(HCLK_USBPM, "hclk_usbpm", CLKOUT_D8, RB(0x1c, 5),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_48_PG_F, "clk_48_pg_f", CLK_48, RB(0xf0, 12),
	       RB(0xf0, 13), RB(0x00, 0), RB(0xf0, 14),
	       RB(0x00, 0), RB(0x160, 4), RB(0x160, 5)),
	D_GATE(CLK_48_PG4, "clk_48_pg4", CLK_48, RB(0xf0, 9),
	       RB(0xf0, 10), RB(0xf0, 11), RB(0x00, 0),
	       RB(0x160, 3), RB(0x00, 0), RB(0x00, 0)),
	D_FFC(CLK_DDRPHY_PLLCLK_D4, "clk_ddrphy_pllclk_d4", CLK_DDRPHY_PLLCLK, 4),
	D_FFC(CLK_ECAT100_D4, "clk_ecat100_d4", CLK_ECAT100, 4),
	D_FFC(CLK_HSR100_D2, "clk_hsr100_d2", CLK_HSR100, 2),
	D_FFC(CLK_REF_SYNC_D4, "clk_ref_sync_d4", CLK_REF_SYNC, 4),
	D_FFC(CLK_REF_SYNC_D8, "clk_ref_sync_d8", CLK_REF_SYNC, 8),
	D_FFC(CLK_SERCOS100_D2, "clk_sercos100_d2", CLK_SERCOS100, 2),
	D_DIV(DIV_CA7, "div_ca7", CLK_REF_SYNC, 57, 1, 4, 1, 2, 4),
	D_MODULE(HCLK_CAN0, "hclk_can0", CLK_48, RB(0xf0, 3),
		 RB(0xf0, 4), RB(0xf0, 5), RB(0x00, 0),
		 RB(0x160, 1), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_CAN1, "hclk_can1", CLK_48, RB(0xf0, 6),
		 RB(0xf0, 7), RB(0xf0, 8), RB(0x00, 0),
		 RB(0x160, 2), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_DELTASIGMA, "hclk_deltasigma", DIV_MOTOR, RB(0x3c, 15),
		 RB(0x3c, 16), RB(0x3c, 17), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_PWMPTO, "hclk_pwmpto", DIV_MOTOR, RB(0x3c, 12),
		 RB(0x3c, 13), RB(0x3c, 14), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_RSV, "hclk_rsv", CLK_48, RB(0xf0, 0),
		 RB(0xf0, 1), RB(0xf0, 2), RB(0x00, 0),
		 RB(0x160, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_SGPIO0, "hclk_sgpio0", DIV_MOTOR, RB(0x3c, 0),
		 RB(0x3c, 1), RB(0x3c, 2), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_SGPIO1, "hclk_sgpio1", DIV_MOTOR, RB(0x3c, 3),
		 RB(0x3c, 4), RB(0x3c, 5), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_DIV(RTOS_MDC, "rtos_mdc", CLK_REF_SYNC, 100, 80, 640, 80, 160, 320, 640),
	D_GATE(CLK_CM3, "clk_cm3", CLK_REF_SYNC_D4, RB(0x174, 0),
	       RB(0x174, 1), RB(0x00, 0), RB(0x174, 2),
	       RB(0x00, 0), RB(0x178, 0), RB(0x178, 1)),
	D_GATE(CLK_DDRC, "clk_ddrc", CLK_DDRPHY_PLLCLK_D4, RB(0x64, 3),
	       RB(0x64, 4), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_ECAT25, "clk_ecat25", CLK_ECAT100_D4, RB(0x80, 3),
	       RB(0x80, 4), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_HSR50, "clk_hsr50", CLK_HSR100_D2, RB(0x90, 4),
	       RB(0x90, 5), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_HW_RTOS, "clk_hw_rtos", CLK_REF_SYNC_D4, RB(0x18c, 0),
	       RB(0x18c, 1), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_GATE(CLK_SERCOS50, "clk_sercos50", CLK_SERCOS100_D2, RB(0x84, 4),
	       RB(0x84, 3), RB(0x00, 0), RB(0x00, 0),
	       RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_ADC, "hclk_adc", CLK_REF_SYNC_D8, RB(0x34, 15),
		 RB(0x34, 16), RB(0x34, 17), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_CM3, "hclk_cm3", CLK_REF_SYNC_D4, RB(0x184, 0),
		 RB(0x184, 1), RB(0x184, 2), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_CRYPTO_EIP150, "hclk_crypto_eip150", CLK_REF_SYNC_D4, RB(0x24, 3),
		 RB(0x24, 4), RB(0x24, 5), RB(0x00, 0),
		 RB(0x28, 2), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_CRYPTO_EIP93, "hclk_crypto_eip93", CLK_REF_SYNC_D4, RB(0x24, 0),
		 RB(0x24, 1), RB(0x00, 0), RB(0x24, 2),
		 RB(0x00, 0), RB(0x28, 0), RB(0x28, 1)),
	D_MODULE(HCLK_DDRC, "hclk_ddrc", CLK_REF_SYNC_D4, RB(0x64, 0),
		 RB(0x64, 2), RB(0x00, 0), RB(0x64, 1),
		 RB(0x00, 0), RB(0x74, 0), RB(0x74, 1)),
	D_MODULE(HCLK_DMA0, "hclk_dma0", CLK_REF_SYNC_D4, RB(0x4c, 0),
		 RB(0x4c, 1), RB(0x4c, 2), RB(0x4c, 3),
		 RB(0x58, 0), RB(0x58, 1), RB(0x58, 2)),
	D_MODULE(HCLK_DMA1, "hclk_dma1", CLK_REF_SYNC_D4, RB(0x4c, 4),
		 RB(0x4c, 5), RB(0x4c, 6), RB(0x4c, 7),
		 RB(0x58, 3), RB(0x58, 4), RB(0x58, 5)),
	D_MODULE(HCLK_GMAC0, "hclk_gmac0", CLK_REF_SYNC_D4, RB(0x6c, 0),
		 RB(0x6c, 1), RB(0x6c, 2), RB(0x6c, 3),
		 RB(0x78, 0), RB(0x78, 1), RB(0x78, 2)),
	D_MODULE(HCLK_GMAC1, "hclk_gmac1", CLK_REF_SYNC_D4, RB(0x70, 0),
		 RB(0x70, 1), RB(0x70, 2), RB(0x70, 3),
		 RB(0x7c, 0), RB(0x7c, 1), RB(0x7c, 2)),
	D_MODULE(HCLK_GPIO0, "hclk_gpio0", CLK_REF_SYNC_D4, RB(0x40, 18),
		 RB(0x40, 19), RB(0x40, 20), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_GPIO1, "hclk_gpio1", CLK_REF_SYNC_D4, RB(0x40, 21),
		 RB(0x40, 22), RB(0x40, 23), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_GPIO2, "hclk_gpio2", CLK_REF_SYNC_D4, RB(0x44, 9),
		 RB(0x44, 10), RB(0x44, 11), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_HSR, "hclk_hsr", CLK_HSR100_D2, RB(0x90, 0),
		 RB(0x90, 2), RB(0x00, 0), RB(0x90, 1),
		 RB(0x00, 0), RB(0x98, 0), RB(0x98, 1)),
	D_MODULE(HCLK_I2C0, "hclk_i2c0", CLK_REF_SYNC_D8, RB(0x34, 9),
		 RB(0x34, 10), RB(0x34, 11), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_I2C1, "hclk_i2c1", CLK_REF_SYNC_D8, RB(0x34, 12),
		 RB(0x34, 13), RB(0x34, 14), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_LCD, "hclk_lcd", CLK_REF_SYNC_D4, RB(0xf4, 0),
		 RB(0xf4, 1), RB(0xf4, 2), RB(0x00, 0),
		 RB(0x164, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_MSEBI_M, "hclk_msebi_m", CLK_REF_SYNC_D4, RB(0x2c, 4),
		 RB(0x2c, 5), RB(0x2c, 6), RB(0x00, 0),
		 RB(0x30, 3), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_MSEBI_S, "hclk_msebi_s", CLK_REF_SYNC_D4, RB(0x2c, 0),
		 RB(0x2c, 1), RB(0x2c, 2), RB(0x2c, 3),
		 RB(0x30, 0), RB(0x30, 1), RB(0x30, 2)),
	D_MODULE(HCLK_NAND, "hclk_nand", CLK_REF_SYNC_D4, RB(0x50, 0),
		 RB(0x50, 1), RB(0x50, 2), RB(0x50, 3),
		 RB(0x5c, 0), RB(0x5c, 1), RB(0x5c, 2)),
	D_MODULE(HCLK_PG_I, "hclk_pg_i", CLK_REF_SYNC_D4, RB(0xf4, 12),
		 RB(0xf4, 13), RB(0x00, 0), RB(0xf4, 14),
		 RB(0x00, 0), RB(0x164, 4), RB(0x164, 5)),
	D_MODULE(HCLK_PG19, "hclk_pg19", CLK_REF_SYNC_D4, RB(0x44, 12),
		 RB(0x44, 13), RB(0x44, 14), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_PG20, "hclk_pg20", CLK_REF_SYNC_D4, RB(0x44, 15),
		 RB(0x44, 16), RB(0x44, 17), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_PG3, "hclk_pg3", CLK_REF_SYNC_D4, RB(0xf4, 6),
		 RB(0xf4, 7), RB(0xf4, 8), RB(0x00, 0),
		 RB(0x164, 2), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_PG4, "hclk_pg4", CLK_REF_SYNC_D4, RB(0xf4, 9),
		 RB(0xf4, 10), RB(0xf4, 11), RB(0x00, 0),
		 RB(0x164, 3), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_QSPI0, "hclk_qspi0", CLK_REF_SYNC_D4, RB(0x54, 0),
		 RB(0x54, 1), RB(0x54, 2), RB(0x54, 3),
		 RB(0x60, 0), RB(0x60, 1), RB(0x60, 2)),
	D_MODULE(HCLK_QSPI1, "hclk_qspi1", CLK_REF_SYNC_D4, RB(0x90, 0),
		 RB(0x90, 1), RB(0x90, 2), RB(0x90, 3),
		 RB(0x98, 0), RB(0x98, 1), RB(0x98, 2)),
	D_MODULE(HCLK_ROM, "hclk_rom", CLK_REF_SYNC_D4, RB(0x154, 0),
		 RB(0x154, 1), RB(0x154, 2), RB(0x00, 0),
		 RB(0x170, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_RTC, "hclk_rtc", CLK_REF_SYNC_D8, RB(0x140, 0),
		 RB(0x140, 3), RB(0x00, 0), RB(0x140, 2),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_SDIO0, "hclk_sdio0", CLK_REF_SYNC_D4, RB(0x0c, 0),
		 RB(0x0c, 1), RB(0x0c, 2), RB(0x0c, 3),
		 RB(0x10, 0), RB(0x10, 1), RB(0x10, 2)),
	D_MODULE(HCLK_SDIO1, "hclk_sdio1", CLK_REF_SYNC_D4, RB(0xc8, 0),
		 RB(0xc8, 1), RB(0xc8, 2), RB(0xc8, 3),
		 RB(0xcc, 0), RB(0xcc, 1), RB(0xcc, 2)),
	D_MODULE(HCLK_SEMAP, "hclk_semap", CLK_REF_SYNC_D4, RB(0xf4, 3),
		 RB(0xf4, 4), RB(0xf4, 5), RB(0x00, 0),
		 RB(0x164, 1), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_SPI0, "hclk_spi0", CLK_REF_SYNC_D4, RB(0x40, 0),
		 RB(0x40, 1), RB(0x40, 2), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_SPI1, "hclk_spi1", CLK_REF_SYNC_D4, RB(0x40, 3),
		 RB(0x40, 4), RB(0x40, 5), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_SPI2, "hclk_spi2", CLK_REF_SYNC_D4, RB(0x40, 6),
		 RB(0x40, 7), RB(0x40, 8), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_SPI3, "hclk_spi3", CLK_REF_SYNC_D4, RB(0x40, 9),
		 RB(0x40, 10), RB(0x40, 11), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_SPI4, "hclk_spi4", CLK_REF_SYNC_D4, RB(0x40, 12),
		 RB(0x40, 13), RB(0x40, 14), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_SPI5, "hclk_spi5", CLK_REF_SYNC_D4, RB(0x40, 15),
		 RB(0x40, 16), RB(0x40, 17), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_SWITCH, "hclk_switch", CLK_REF_SYNC_D4, RB(0x130, 0),
		 RB(0x00, 0), RB(0x130, 1), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_SWITCH_RG, "hclk_switch_rg", CLK_REF_SYNC_D4, RB(0x188, 0),
		 RB(0x188, 1), RB(0x188, 2), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_UART0, "hclk_uart0", CLK_REF_SYNC_D8, RB(0x34, 0),
		 RB(0x34, 1), RB(0x34, 2), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_UART1, "hclk_uart1", CLK_REF_SYNC_D8, RB(0x34, 3),
		 RB(0x34, 4), RB(0x34, 5), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_UART2, "hclk_uart2", CLK_REF_SYNC_D8, RB(0x34, 6),
		 RB(0x34, 7), RB(0x34, 8), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_UART3, "hclk_uart3", CLK_REF_SYNC_D4, RB(0x40, 24),
		 RB(0x40, 25), RB(0x40, 26), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_UART4, "hclk_uart4", CLK_REF_SYNC_D4, RB(0x40, 27),
		 RB(0x40, 28), RB(0x40, 29), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_UART5, "hclk_uart5", CLK_REF_SYNC_D4, RB(0x44, 0),
		 RB(0x44, 1), RB(0x44, 2), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_UART6, "hclk_uart6", CLK_REF_SYNC_D4, RB(0x44, 3),
		 RB(0x44, 4), RB(0x44, 5), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	D_MODULE(HCLK_UART7, "hclk_uart7", CLK_REF_SYNC_D4, RB(0x44, 6),
		 RB(0x44, 7), RB(0x44, 8), RB(0x00, 0),
		 RB(0x00, 0), RB(0x00, 0), RB(0x00, 0)),
	/*
	 * These are not hardware clocks, but are needed to handle the special
	 * case where we have a 'selector bit' that doesn't just change the
	 * parent for a clock, but also the gate it's supposed to use.
	 */
	{
		.index = R9A06G032_UART_GROUP_012,
		.name = "uart_group_012",
		.type = K_BITSEL,
		.source = 1 + R9A06G032_DIV_UART,
		/* R9A06G032_SYSCTRL_REG_PWRCTRL_PG0_0 */
		.dual.sel = RB(0x34, 30),
		.dual.group = 0,
	},
	{
		.index = R9A06G032_UART_GROUP_34567,
		.name = "uart_group_34567",
		.type = K_BITSEL,
		.source = 1 + R9A06G032_DIV_P2_PG,
		/* R9A06G032_SYSCTRL_REG_PWRCTRL_PG1_PR2 */
		.dual.sel = RB(0xec, 24),
		.dual.group = 1,
	},
	D_UGATE(CLK_UART0, "clk_uart0", UART_GROUP_012, 0,
		RB(0x34, 18), RB(0x34, 19), RB(0x34, 20), RB(0x34, 21)),
	D_UGATE(CLK_UART1, "clk_uart1", UART_GROUP_012, 0,
		RB(0x34, 22), RB(0x34, 23), RB(0x34, 24), RB(0x34, 25)),
	D_UGATE(CLK_UART2, "clk_uart2", UART_GROUP_012, 0,
		RB(0x34, 26), RB(0x34, 27), RB(0x34, 28), RB(0x34, 29)),
	D_UGATE(CLK_UART3, "clk_uart3", UART_GROUP_34567, 1,
		RB(0xec, 0), RB(0xec, 1), RB(0xec, 2), RB(0xec, 3)),
	D_UGATE(CLK_UART4, "clk_uart4", UART_GROUP_34567, 1,
		RB(0xec, 4), RB(0xec, 5), RB(0xec, 6), RB(0xec, 7)),
	D_UGATE(CLK_UART5, "clk_uart5", UART_GROUP_34567, 1,
		RB(0xec, 8), RB(0xec, 9), RB(0xec, 10), RB(0xec, 11)),
	D_UGATE(CLK_UART6, "clk_uart6", UART_GROUP_34567, 1,
		RB(0xec, 12), RB(0xec, 13), RB(0xec, 14), RB(0xec, 15)),
	D_UGATE(CLK_UART7, "clk_uart7", UART_GROUP_34567, 1,
		RB(0xec, 16), RB(0xec, 17), RB(0xec, 18), RB(0xec, 19)),
};

struct r9a06g032_priv {
	struct regmap		*regmap;
	struct clk		mclk;
};

static const struct r9a06g032_clkdesc *r9a06g032_clk_get(struct clk *clk)
{
	const unsigned long clkid = clk->id & 0xffff;
	int i;

	for (i = 0; i < ARRAY_SIZE(r9a06g032_clocks); i++) {
		if (r9a06g032_clocks[i].index == clkid)
			return &r9a06g032_clocks[i];
	}

	return NULL;
}

#define PARENT_ID (~0)

static int r9a06g032_clk_get_parent(struct clk *clk, struct clk *parent)
{
	const struct r9a06g032_clkdesc *desc = r9a06g032_clk_get(clk);

	if (!desc)
		return -ENOENT;

	if (desc->source)
		parent->id = desc->source - 1;
	else
		parent->id = PARENT_ID;	/* Top-level clock */

	parent->dev = clk->dev;

	return 0;
}

static ulong r9a06g032_clk_get_parent_rate(struct clk *clk)
{
	struct clk parent;
	unsigned long parent_rate;
	struct r9a06g032_priv *clocks = dev_get_priv(clk->dev);

	if (r9a06g032_clk_get_parent(clk, &parent)) {
		dev_dbg(clk->dev, "Failed to get parent clock for id=%lu\b", clk->id);
		return 0;
	}

	if (parent.id == PARENT_ID)
		parent_rate = clk_get_rate(&clocks->mclk);
	else
		parent_rate = clk_get_rate(&parent);

	if (!parent_rate)
		dev_dbg(clk->dev, "%s: parent_rate is zero\n", __func__);

	return parent_rate;
}

/* register/bit pairs are encoded as an uint16_t */
static void clk_rdesc_set(struct r9a06g032_priv *clocks,
			  struct regbit rb, unsigned int on)
{
	uint reg = rb.reg * 4;
	uint bit = rb.bit;

	if (!reg && !bit)
		return;

	uint mask = BIT(bit);
	uint val = (!!on) << bit;

	regmap_update_bits(clocks->regmap, reg, mask, val);
}

static int clk_rdesc_get(struct r9a06g032_priv *clocks,
			 struct regbit rb)
{
	uint reg = rb.reg * 4;
	uint bit = rb.bit;
	u32 val = 0;

	regmap_read(clocks->regmap, reg, &val);

	return !!(val & BIT(bit));
}

/*
 * Cheating a little bit here: leverage the existing code to control the
 * per-clock reset. It should really be handled by a reset controller instead.
 */
void clk_rzn1_reset_state(struct clk *clk, int on)
{
	struct r9a06g032_priv *clocks = dev_get_priv(clk->dev);
	const struct r9a06g032_clkdesc *desc = r9a06g032_clk_get(clk);
	const struct r9a06g032_gate *g;

	assert(desc);
	assert(desc->type == K_GATE);
	g = &desc->gate;

	clk_rdesc_set(clocks, g->reset, on);
}

/*
 * This implements the R9A06G032 clock gate 'driver'. We cannot use the system's
 * clock gate framework as the gates on the R9A06G032 have a special enabling
 * sequence, therefore we use this little proxy.
 */
static int r9a06g032_clk_gate_set(struct clk *clk, int on)
{
	struct r9a06g032_priv *clocks = dev_get_priv(clk->dev);
	const struct r9a06g032_clkdesc *desc = r9a06g032_clk_get(clk);
	const struct r9a06g032_gate *g;

	assert(desc);
	assert(desc->type == K_GATE);
	g = &desc->gate;

	/* Enable or disable the clock */
	clk_rdesc_set(clocks, g->gate, on);

	/* De-assert reset */
	clk_rdesc_set(clocks, g->reset, 1);

	/* Hardware manual recommends 5us delay after enabling clock & reset */
	udelay(5);

	/* If the peripheral is memory mapped (i.e. an AXI slave), there is an
	 * associated SLVRDY bit in the System Controller that needs to be set
	 * so that the FlexWAY bus fabric passes on the read/write requests.
	 */
	clk_rdesc_set(clocks, g->ready, on);

	/* Clear 'Master Idle Request' bit */
	clk_rdesc_set(clocks, g->midle, !on);

	/* Note: We don't wait for FlexWAY Socket Connection signal */

	return 0;
}

static int r9a06g032_clk_gate_enable(struct clk *clk)
{
	return r9a06g032_clk_gate_set(clk, 1);
}

static int r9a06g032_clk_gate_disable(struct clk *clk)
{
	return r9a06g032_clk_gate_set(clk, 0);
}

/*
 * Fixed factor clock
 */
static ulong r9a06g032_ffc_get_rate(struct clk *clk)
{
	const struct r9a06g032_clkdesc *desc = r9a06g032_clk_get(clk);
	unsigned long parent_rate = r9a06g032_clk_get_parent_rate(clk);
	unsigned long long rate;

	rate = (unsigned long long)parent_rate * desc->mul;
	rate = DIV_ROUND_UP(rate, desc->div);

	return (ulong)rate;
}

/*
 * This implements R9A06G032 clock divider 'driver'. This differs from the
 * standard clk_divider because the set_rate method must also set b[31] to
 * trigger the hardware rate change. In theory it should also wait for this
 * bit to clear.
 */
static ulong r9a06g032_div_get_rate(struct clk *clk)
{
	struct r9a06g032_priv *clocks = dev_get_priv(clk->dev);
	const struct r9a06g032_clkdesc *desc = r9a06g032_clk_get(clk);
	unsigned long parent_rate = r9a06g032_clk_get_parent_rate(clk);
	u32 div = 0;

	regmap_read(clocks->regmap, 4 * desc->reg, &div);

	if (div < desc->div_min)
		div = desc->div_min;
	else if (div > desc->div_max)
		div = desc->div_max;
	return DIV_ROUND_UP(parent_rate, div);
}

static ulong r9a06g032_div_set_rate(struct clk *clk, ulong rate)
{
	struct r9a06g032_priv *clocks = dev_get_priv(clk->dev);
	const struct r9a06g032_clkdesc *desc = r9a06g032_clk_get(clk);
	unsigned long parent_rate = r9a06g032_clk_get_parent_rate(clk);
	size_t i;

	/* + 1 to cope with rates that have the remainder dropped */
	u32 div = DIV_ROUND_UP(parent_rate, rate + 1);

	/* Clamp to allowable range */
	if (div < desc->div_min)
		div = desc->div_min;
	else if (div > desc->div_max)
		div = desc->div_max;

	/* Limit to allowable divisors */
	for (i = 0; i < ARRAY_SIZE(desc->div_table) - 2; i++) {
		u16 div_m = desc->div_table[i];
		u16 div_p = desc->div_table[i + 1];

		if (!div_m || !div_p)
			continue;

		if (div >= div_m && div <= div_p) {
			/*
			 * select the divider that generates
			 * the value closest to ideal frequency
			 */
			u32 m = rate - DIV_ROUND_UP(parent_rate, div_m);
			u32 p = DIV_ROUND_UP(parent_rate, div_p) - rate;

			div = p >= m ? div_m : div_p;
		}
	}

	dev_dbg(clk->dev, "%s clkid %lu rate %ld parent %ld div %d\n",
		__func__, clk->id, rate, parent_rate, div);

	/*
	 * Need to write the bit 31 with the divider value to
	 * latch it. Technically we should wait until it has been
	 * cleared too.
	 * TODO: Find whether this callback is sleepable, in case
	 * the hardware /does/ require some sort of spinloop here.
	 */
	regmap_write(clocks->regmap, 4 * desc->reg, div | BIT(31));

	return 0;
}

/*
 * Dual gate. This handles toggling the approprate clock/reset bits,
 * which depends on the mux setting above.
 */
static int r9a06g032_clk_dualgate_setenable(struct r9a06g032_priv *clocks,
					    const struct r9a06g032_clkdesc *desc,
					    int enable)
{
	u8 sel_bit = clk_rdesc_get(clocks, desc->dual.sel);
	struct regbit gate[2] = { desc->dual.g1, desc->dual.g2 };
	struct regbit reset[2] = { desc->dual.r1, desc->dual.r2 };

	/* we always turn off the 'other' gate, regardless */
	clk_rdesc_set(clocks, gate[!sel_bit], 0);
	clk_rdesc_set(clocks, reset[!sel_bit], 1);

	/* set the gate as requested */
	clk_rdesc_set(clocks, gate[sel_bit], enable);
	clk_rdesc_set(clocks, reset[sel_bit], 1);

	return 0;
}

static int r9a06g032_clk_dualgate_enable(struct clk *clk)
{
	struct r9a06g032_priv *clocks = dev_get_priv(clk->dev);
	const struct r9a06g032_clkdesc *desc = r9a06g032_clk_get(clk);

	return r9a06g032_clk_dualgate_setenable(clocks, desc, 1);
}

static int r9a06g032_clk_dualgate_disable(struct clk *clk)
{
	struct r9a06g032_priv *clocks = dev_get_priv(clk->dev);
	const struct r9a06g032_clkdesc *desc = r9a06g032_clk_get(clk);

	return r9a06g032_clk_dualgate_setenable(clocks, desc, 0);
}

static int r9a06g032_clk_dualgate_is_enabled(struct clk *clk)
{
	struct r9a06g032_priv *clocks = dev_get_priv(clk->dev);
	const struct r9a06g032_clkdesc *desc = r9a06g032_clk_get(clk);
	u8 sel_bit = clk_rdesc_get(clocks, desc->dual.sel);
	struct regbit gate[2] = { desc->dual.g1, desc->dual.g2 };

	return clk_rdesc_get(clocks, gate[sel_bit]);
}

/*
 * Main clock driver
 */
static int r9a06g032_clk_enable(struct clk *clk)
{
	const struct r9a06g032_clkdesc *desc = r9a06g032_clk_get(clk);

	switch (desc->type) {
	case K_GATE:
		return r9a06g032_clk_gate_enable(clk);
	case K_DUALGATE:
		return r9a06g032_clk_dualgate_enable(clk);
	default:
		dev_dbg(clk->dev, "ERROR: unhandled type=%d\n", desc->type);
		break;
	}

	return 0;
}

static int r9a06g032_clk_disable(struct clk *clk)
{
	const struct r9a06g032_clkdesc *desc = r9a06g032_clk_get(clk);

	switch (desc->type) {
	case K_GATE:
		return r9a06g032_clk_gate_disable(clk);
	case K_DUALGATE:
		return r9a06g032_clk_dualgate_disable(clk);
	default:
		dev_dbg(clk->dev, "ERROR: unhandled type=%d\n", desc->type);
		break;
	}

	return 0;
}

static ulong r9a06g032_clk_get_rate(struct clk *clk)
{
	const struct r9a06g032_clkdesc *desc = r9a06g032_clk_get(clk);
	ulong ret = 0;

	assert(desc);

	switch (desc->type) {
	case K_FFC:
		ret = r9a06g032_ffc_get_rate(clk);
		break;
	case K_GATE:
		ret = r9a06g032_clk_get_parent_rate(clk);
		break;
	case K_DIV:
		ret = r9a06g032_div_get_rate(clk);
		break;
	case K_BITSEL:
		/*
		 * Look at the mux to determine parent.
		 * 0 means it is coming from UART DIV (group 012 or 34567)
		 * 1 means it is coming from USB_PLL (fixed at 48MHz)
		 */
		if (r9a06g032_clk_dualgate_is_enabled(clk)) {
			struct clk usb_clk = { .id = R9A06G032_CLK_PLL_USB };

			ret = r9a06g032_clk_get_parent_rate(&usb_clk);
		} else {
			ret = r9a06g032_clk_get_parent_rate(clk);
		}
		break;
	case K_DUALGATE:
		ret = r9a06g032_clk_get_parent_rate(clk);
		break;
	}

	return ret;
}

static ulong r9a06g032_clk_set_rate(struct clk *clk, ulong rate)
{
	const struct r9a06g032_clkdesc *desc = r9a06g032_clk_get(clk);
	ulong ret = 0;

	assert(desc);

	switch (desc->type) {
	case K_DIV:
		ret = r9a06g032_div_set_rate(clk, rate);
		break;
	default:
		dev_dbg(clk->dev, "ERROR: not implemented for %d\n", desc->type);
	};

	return ret;
}

static int r9a06g032_clk_of_xlate(struct clk *clk, struct ofnode_phandle_args *args)
{
	if (args->args_count != 1) {
		dev_dbg(clk->dev, "Invalid args_count: %d\n", args->args_count);
		return -EINVAL;
	}

	clk->id = args->args[0];

	return 0;
}

static const struct clk_ops r9a06g032_clk_ops = {
	.enable		= r9a06g032_clk_enable,
	.disable	= r9a06g032_clk_disable,
	.get_rate	= r9a06g032_clk_get_rate,
	.set_rate	= r9a06g032_clk_set_rate,
	.of_xlate	= r9a06g032_clk_of_xlate,
};

/* Reset Enable Register */
#define RZN1_SYSCTRL_REG_RSTEN			288 /* 0x120*/
#define RZN1_SYSCTRL_REG_RSTEN_MRESET_EN		BIT(0)
#define RZN1_SYSCTRL_REG_RSTEN_WDA7RST_CA7_0_EN		BIT(1)
#define RZN1_SYSCTRL_REG_RSTEN_WDA7RST_CA7_1_EN		BIT(2)
#define RZN1_SYSCTRL_REG_RSTEN_WDM3RST_EN		BIT(3)
#define RZN1_SYSCTRL_REG_RSTEN_CM3LOCKUPRST_EN		BIT(4)
#define RZN1_SYSCTRL_REG_RSTEN_CM3SYSRESET_EN		BIT(5)
#define RZN1_SYSCTRL_REG_RSTEN_SWRST_EN			BIT(6)

static int r9a06g032_clk_probe(struct udevice *dev)
{
	struct r9a06g032_priv *priv = dev_get_priv(dev);

	priv->regmap = syscon_regmap_lookup_by_phandle(dev, "regmap");
	if (IS_ERR(priv->regmap)) {
		dev_dbg(dev, "unable to find regmap\n");
		return PTR_ERR(priv->regmap);
	}

	/* Enable S/W reset */
	regmap_write(priv->regmap, RZN1_SYSCTRL_REG_RSTEN,
		     RZN1_SYSCTRL_REG_RSTEN_MRESET_EN |
		     RZN1_SYSCTRL_REG_RSTEN_SWRST_EN);

	/* Get master clock */
	return clk_get_by_name(dev, "mclk", &priv->mclk);
}

static const struct udevice_id r9a06g032_clk_ids[] = {
	{ .compatible = "renesas,r9a06g032-sysctrl" },
	{ }
};

U_BOOT_DRIVER(clk_r9a06g032) = {
	.name		= "clk_r9a06g032",
	.id		= UCLASS_CLK,
	.of_match	= r9a06g032_clk_ids,
	.priv_auto	= sizeof(struct r9a06g032_priv),
	.ops		= &r9a06g032_clk_ops,
	.probe		= &r9a06g032_clk_probe,
	.flags		= DM_FLAG_PRE_RELOC,
};