drivers/clk/kendryte/clk.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2019-20 Sean Anderson <seanga2@gmail.com>
 */
#include <kendryte/clk.h>

#include <asm/io.h>
#include <dt-bindings/clock/k210-sysctl.h>
#include <dt-bindings/mfd/k210-sysctl.h>
#include <dm.h>
#include <log.h>
#include <mapmem.h>

#include <kendryte/bypass.h>
#include <kendryte/pll.h>

/* All methods are delegated to CCF clocks */

static ulong k210_clk_get_rate(struct clk *clk)
{
	struct clk *c;
	int err = clk_get_by_id(clk->id, &c);

	if (err)
		return err;
	return clk_get_rate(c);
}

static ulong k210_clk_set_rate(struct clk *clk, unsigned long rate)
{
	struct clk *c;
	int err = clk_get_by_id(clk->id, &c);

	if (err)
		return err;
	return clk_set_rate(c, rate);
}

static int k210_clk_set_parent(struct clk *clk, struct clk *parent)
{
	struct clk *c, *p;
	int err = clk_get_by_id(clk->id, &c);

	if (err)
		return err;

	err = clk_get_by_id(parent->id, &p);
	if (err)
		return err;

	return clk_set_parent(c, p);
}

static int k210_clk_endisable(struct clk *clk, bool enable)
{
	struct clk *c;
	int err = clk_get_by_id(clk->id, &c);

	if (err)
		return err;
	return enable ? clk_enable(c) : clk_disable(c);
}

static int k210_clk_enable(struct clk *clk)
{
	return k210_clk_endisable(clk, true);
}

static int k210_clk_disable(struct clk *clk)
{
	return k210_clk_endisable(clk, false);
}

static const struct clk_ops k210_clk_ops = {
	.set_rate = k210_clk_set_rate,
	.get_rate = k210_clk_get_rate,
	.set_parent = k210_clk_set_parent,
	.enable = k210_clk_enable,
	.disable = k210_clk_disable,
};

/* Parents for muxed clocks */
static const char * const generic_sels[] = { "in0_half", "pll0_half" };
/* The first clock is in0, which is filled in by k210_clk_probe */
static const char *aclk_sels[] = { NULL, "pll0_half" };
static const char *pll2_sels[] = { NULL, "pll0", "pll1" };

/*
 * All parameters for different sub-clocks are collected into parameter arrays.
 * These parameters are then initialized by the clock which uses them during
 * probe. To save space, ids are automatically generated for each sub-clock by
 * using an enum. Instead of storing a parameter struct for each clock, even for
 * those clocks which don't use a particular type of sub-clock, we can just
 * store the parameters for the clocks which need them.
 *
 * So why do it like this? Arranging all the sub-clocks together makes it very
 * easy to find bugs in the code.
 */

#define DIV(id, off, shift, width) DIV_FLAGS(id, off, shift, width, 0)
#define DIV_LIST \
	DIV_FLAGS(K210_CLK_ACLK, K210_SYSCTL_SEL0, 1, 2, \
		  CLK_DIVIDER_POWER_OF_TWO) \
	DIV(K210_CLK_APB0,   K210_SYSCTL_SEL0,  3,  3) \
	DIV(K210_CLK_APB1,   K210_SYSCTL_SEL0,  6,  3) \
	DIV(K210_CLK_APB2,   K210_SYSCTL_SEL0,  9,  3) \
	DIV(K210_CLK_SRAM0,  K210_SYSCTL_THR0,  0,  4) \
	DIV(K210_CLK_SRAM1,  K210_SYSCTL_THR0,  4,  4) \
	DIV(K210_CLK_AI,     K210_SYSCTL_THR0,  8,  4) \
	DIV(K210_CLK_DVP,    K210_SYSCTL_THR0, 12,  4) \
	DIV(K210_CLK_ROM,    K210_SYSCTL_THR0, 16,  4) \
	DIV(K210_CLK_SPI0,   K210_SYSCTL_THR1,  0,  8) \
	DIV(K210_CLK_SPI1,   K210_SYSCTL_THR1,  8,  8) \
	DIV(K210_CLK_SPI2,   K210_SYSCTL_THR1, 16,  8) \
	DIV(K210_CLK_SPI3,   K210_SYSCTL_THR1, 24,  8) \
	DIV(K210_CLK_TIMER0, K210_SYSCTL_THR2,  0,  8) \
	DIV(K210_CLK_TIMER1, K210_SYSCTL_THR2,  8,  8) \
	DIV(K210_CLK_TIMER2, K210_SYSCTL_THR2, 16,  8) \
	DIV(K210_CLK_I2S0,   K210_SYSCTL_THR3,  0, 16) \
	DIV(K210_CLK_I2S1,   K210_SYSCTL_THR3, 16, 16) \
	DIV(K210_CLK_I2S2,   K210_SYSCTL_THR4,  0, 16) \
	DIV(K210_CLK_I2S0_M, K210_SYSCTL_THR4, 16,  8) \
	DIV(K210_CLK_I2S1_M, K210_SYSCTL_THR4, 24,  8) \
	DIV(K210_CLK_I2S2_M, K210_SYSCTL_THR4,  0,  8) \
	DIV(K210_CLK_I2C0,   K210_SYSCTL_THR5,  8,  8) \
	DIV(K210_CLK_I2C1,   K210_SYSCTL_THR5, 16,  8) \
	DIV(K210_CLK_I2C2,   K210_SYSCTL_THR5, 24,  8) \
	DIV(K210_CLK_WDT0,   K210_SYSCTL_THR6,  0,  8) \
	DIV(K210_CLK_WDT1,   K210_SYSCTL_THR6,  8,  8)

#define _DIVIFY(id) K210_CLK_DIV_##id
#define DIVIFY(id) _DIVIFY(id)

enum k210_div_ids {
#define DIV_FLAGS(id, ...) DIVIFY(id),
	DIV_LIST
#undef DIV_FLAGS
};

struct k210_div_params {
	u8 off;
	u8 shift;
	u8 width;
	u8 flags;
};

static const struct k210_div_params k210_divs[] = {
#define DIV_FLAGS(id, _off, _shift, _width, _flags) \
	[DIVIFY(id)] = { \
		.off = (_off), \
		.shift = (_shift), \
		.width = (_width), \
		.flags = (_flags), \
	},
	DIV_LIST
#undef DIV_FLAGS
};

#undef DIV
#undef DIV_LIST

#define GATE_LIST \
	GATE(K210_CLK_CPU,    K210_SYSCTL_EN_CENT,  0) \
	GATE(K210_CLK_SRAM0,  K210_SYSCTL_EN_CENT,  1) \
	GATE(K210_CLK_SRAM1,  K210_SYSCTL_EN_CENT,  2) \
	GATE(K210_CLK_APB0,   K210_SYSCTL_EN_CENT,  3) \
	GATE(K210_CLK_APB1,   K210_SYSCTL_EN_CENT,  4) \
	GATE(K210_CLK_APB2,   K210_SYSCTL_EN_CENT,  5) \
	GATE(K210_CLK_ROM,    K210_SYSCTL_EN_PERI,  0) \
	GATE(K210_CLK_DMA,    K210_SYSCTL_EN_PERI,  1) \
	GATE(K210_CLK_AI,     K210_SYSCTL_EN_PERI,  2) \
	GATE(K210_CLK_DVP,    K210_SYSCTL_EN_PERI,  3) \
	GATE(K210_CLK_FFT,    K210_SYSCTL_EN_PERI,  4) \
	GATE(K210_CLK_GPIO,   K210_SYSCTL_EN_PERI,  5) \
	GATE(K210_CLK_SPI0,   K210_SYSCTL_EN_PERI,  6) \
	GATE(K210_CLK_SPI1,   K210_SYSCTL_EN_PERI,  7) \
	GATE(K210_CLK_SPI2,   K210_SYSCTL_EN_PERI,  8) \
	GATE(K210_CLK_SPI3,   K210_SYSCTL_EN_PERI,  9) \
	GATE(K210_CLK_I2S0,   K210_SYSCTL_EN_PERI, 10) \
	GATE(K210_CLK_I2S1,   K210_SYSCTL_EN_PERI, 11) \
	GATE(K210_CLK_I2S2,   K210_SYSCTL_EN_PERI, 12) \
	GATE(K210_CLK_I2C0,   K210_SYSCTL_EN_PERI, 13) \
	GATE(K210_CLK_I2C1,   K210_SYSCTL_EN_PERI, 14) \
	GATE(K210_CLK_I2C2,   K210_SYSCTL_EN_PERI, 15) \
	GATE(K210_CLK_UART1,  K210_SYSCTL_EN_PERI, 16) \
	GATE(K210_CLK_UART2,  K210_SYSCTL_EN_PERI, 17) \
	GATE(K210_CLK_UART3,  K210_SYSCTL_EN_PERI, 18) \
	GATE(K210_CLK_AES,    K210_SYSCTL_EN_PERI, 19) \
	GATE(K210_CLK_FPIOA,  K210_SYSCTL_EN_PERI, 20) \
	GATE(K210_CLK_TIMER0, K210_SYSCTL_EN_PERI, 21) \
	GATE(K210_CLK_TIMER1, K210_SYSCTL_EN_PERI, 22) \
	GATE(K210_CLK_TIMER2, K210_SYSCTL_EN_PERI, 23) \
	GATE(K210_CLK_WDT0,   K210_SYSCTL_EN_PERI, 24) \
	GATE(K210_CLK_WDT1,   K210_SYSCTL_EN_PERI, 25) \
	GATE(K210_CLK_SHA,    K210_SYSCTL_EN_PERI, 26) \
	GATE(K210_CLK_OTP,    K210_SYSCTL_EN_PERI, 27) \
	GATE(K210_CLK_RTC,    K210_SYSCTL_EN_PERI, 29)

#define _GATEIFY(id) K210_CLK_GATE_##id
#define GATEIFY(id) _GATEIFY(id)

enum k210_gate_ids {
#define GATE(id, ...) GATEIFY(id),
	GATE_LIST
#undef GATE
};

struct k210_gate_params {
	u8 off;
	u8 bit_idx;
};

static const struct k210_gate_params k210_gates[] = {
#define GATE(id, _off, _idx) \
	[GATEIFY(id)] = { \
		.off = (_off), \
		.bit_idx = (_idx), \
	},
	GATE_LIST
#undef GATE
};

#undef GATE_LIST

#define MUX(id, reg, shift, width) \
	MUX_PARENTS(id, generic_sels, reg, shift, width)
#define MUX_LIST \
	MUX_PARENTS(K210_CLK_PLL2, pll2_sels, K210_SYSCTL_PLL2, 26, 2) \
	MUX_PARENTS(K210_CLK_ACLK, aclk_sels, K210_SYSCTL_SEL0,  0, 1) \
	MUX(K210_CLK_SPI3,   K210_SYSCTL_SEL0, 12, 1) \
	MUX(K210_CLK_TIMER0, K210_SYSCTL_SEL0, 13, 1) \
	MUX(K210_CLK_TIMER1, K210_SYSCTL_SEL0, 14, 1) \
	MUX(K210_CLK_TIMER2, K210_SYSCTL_SEL0, 15, 1)

#define _MUXIFY(id) K210_CLK_MUX_##id
#define MUXIFY(id) _MUXIFY(id)

enum k210_mux_ids {
#define MUX_PARENTS(id, ...) MUXIFY(id),
	MUX_LIST
#undef MUX_PARENTS
	K210_CLK_MUX_NONE,
};

struct k210_mux_params {
	const char *const *parent_names;
	u8 num_parents;
	u8 off;
	u8 shift;
	u8 width;
};

static const struct k210_mux_params k210_muxes[] = {
#define MUX_PARENTS(id, parents, _off, _shift, _width) \
	[MUXIFY(id)] = { \
		.parent_names = (const char * const *)(parents), \
		.num_parents = ARRAY_SIZE(parents), \
		.off = (_off), \
		.shift = (_shift), \
		.width = (_width), \
	},
	MUX_LIST
#undef MUX_PARENTS
};

#undef MUX
#undef MUX_LIST

struct k210_pll_params {
	u8 off;
	u8 lock_off;
	u8 shift;
	u8 width;
};

static const struct k210_pll_params k210_plls[] = {
#define PLL(_off, _shift, _width) { \
	.off = (_off), \
	.lock_off = K210_SYSCTL_PLL_LOCK, \
	.shift = (_shift), \
	.width = (_width), \
}
	[0] = PLL(K210_SYSCTL_PLL0,  0, 2),
	[1] = PLL(K210_SYSCTL_PLL1,  8, 1),
	[2] = PLL(K210_SYSCTL_PLL2, 16, 1),
#undef PLL
};

#define COMP(id) \
	COMP_FULL(id, MUXIFY(id), DIVIFY(id), GATEIFY(id))
#define COMP_NOMUX(id) \
	COMP_FULL(id, K210_CLK_MUX_NONE, DIVIFY(id), GATEIFY(id))
#define COMP_LIST \
	COMP(K210_CLK_SPI3) \
	COMP(K210_CLK_TIMER0) \
	COMP(K210_CLK_TIMER1) \
	COMP(K210_CLK_TIMER2) \
	COMP_NOMUX(K210_CLK_SRAM0) \
	COMP_NOMUX(K210_CLK_SRAM1) \
	COMP_NOMUX(K210_CLK_ROM) \
	COMP_NOMUX(K210_CLK_DVP) \
	COMP_NOMUX(K210_CLK_APB0) \
	COMP_NOMUX(K210_CLK_APB1) \
	COMP_NOMUX(K210_CLK_APB2) \
	COMP_NOMUX(K210_CLK_AI) \
	COMP_NOMUX(K210_CLK_I2S0) \
	COMP_NOMUX(K210_CLK_I2S1) \
	COMP_NOMUX(K210_CLK_I2S2) \
	COMP_NOMUX(K210_CLK_WDT0) \
	COMP_NOMUX(K210_CLK_WDT1) \
	COMP_NOMUX(K210_CLK_SPI0) \
	COMP_NOMUX(K210_CLK_SPI1) \
	COMP_NOMUX(K210_CLK_SPI2) \
	COMP_NOMUX(K210_CLK_I2C0) \
	COMP_NOMUX(K210_CLK_I2C1) \
	COMP_NOMUX(K210_CLK_I2C2)

#define _COMPIFY(id) K210_CLK_COMP_##id
#define COMPIFY(id) _COMPIFY(id)

enum k210_comp_ids {
#define COMP_FULL(id, ...) COMPIFY(id),
	COMP_LIST
#undef COMP_FULL
};

struct k210_comp_params {
	u8 mux;
	u8 div;
	u8 gate;
};

static const struct k210_comp_params k210_comps[] = {
#define COMP_FULL(id, _mux, _div, _gate) \
	[COMPIFY(id)] = { \
		.mux = (_mux), \
		.div = (_div), \
		.gate = (_gate), \
	},
	COMP_LIST
#undef COMP_FULL
};

#undef COMP
#undef COMP_ID
#undef COMP_NOMUX
#undef COMP_NOMUX_ID
#undef COMP_LIST

static struct clk *k210_bypass_children = {
	NULL,
};

/* Helper functions to create sub-clocks */
static struct clk_mux *k210_create_mux(const struct k210_mux_params *params,
				       void *base)
{
	struct clk_mux *mux = kzalloc(sizeof(*mux), GFP_KERNEL);

	if (!mux)
		return mux;

	mux->reg = base + params->off;
	mux->mask = BIT(params->width) - 1;
	mux->shift = params->shift;
	mux->parent_names = params->parent_names;
	mux->num_parents = params->num_parents;

	return mux;
}

static struct clk_divider *k210_create_div(const struct k210_div_params *params,
					   void *base)
{
	struct clk_divider *div = kzalloc(sizeof(*div), GFP_KERNEL);

	if (!div)
		return div;

	div->reg = base + params->off;
	div->shift = params->shift;
	div->width = params->width;
	div->flags = params->flags;

	return div;
}

static struct clk_gate *k210_create_gate(const struct k210_gate_params *params,
					 void *base)
{
	struct clk_gate *gate = kzalloc(sizeof(*gate), GFP_KERNEL);

	if (!gate)
		return gate;

	gate->reg = base + params->off;
	gate->bit_idx = params->bit_idx;

	return gate;
}

static struct k210_pll *k210_create_pll(const struct k210_pll_params *params,
					void *base)
{
	struct k210_pll *pll = kzalloc(sizeof(*pll), GFP_KERNEL);

	if (!pll)
		return pll;

	pll->reg = base + params->off;
	pll->lock = base + params->lock_off;
	pll->shift = params->shift;
	pll->width = params->width;

	return pll;
}

/* Create all sub-clocks, and then register the composite clock */
static struct clk *k210_register_comp(const struct k210_comp_params *params,
				      void *base, const char *name,
				      const char *parent)
{
	const char *const *parent_names;
	int num_parents;
	struct clk *comp;
	const struct clk_ops *mux_ops;
	struct clk_mux *mux;
	struct clk_divider *div;
	struct clk_gate *gate;

	if (params->mux == K210_CLK_MUX_NONE) {
		if (!parent)
			return ERR_PTR(-EINVAL);

		mux_ops = NULL;
		mux = NULL;
		parent_names = &parent;
		num_parents = 1;
	} else {
		mux_ops = &clk_mux_ops;
		mux = k210_create_mux(&k210_muxes[params->mux], base);
		if (!mux)
			return ERR_PTR(-ENOMEM);

		parent_names = mux->parent_names;
		num_parents = mux->num_parents;
	}

	div = k210_create_div(&k210_divs[params->div], base);
	if (!div) {
		comp = ERR_PTR(-ENOMEM);
		goto cleanup_mux;
	}

	gate = k210_create_gate(&k210_gates[params->gate], base);
	if (!gate) {
		comp = ERR_PTR(-ENOMEM);
		goto cleanup_div;
	}

	comp = clk_register_composite(NULL, name, parent_names, num_parents,
				      &mux->clk, mux_ops,
				      &div->clk, &clk_divider_ops,
				      &gate->clk, &clk_gate_ops, 0);
	if (IS_ERR(comp))
		goto cleanup_gate;
	return comp;

cleanup_gate:
	free(gate);
cleanup_div:
	free(div);
cleanup_mux:
	free(mux);
	return comp;
}

static bool probed;

static int k210_clk_probe(struct udevice *dev)
{
	int ret;
	const char *in0;
	struct clk *in0_clk, *bypass;
	struct clk_mux *mux;
	struct clk_divider *div;
	struct k210_pll *pll;
	void *base;

	/*
	 * Only one instance of this driver allowed. This prevents weird bugs
	 * when the driver fails part-way through probing. Some clocks will
	 * already have been registered, and re-probing will register them
	 * again, creating a bunch of duplicates. Better error-handling/cleanup
	 * could fix this, but it's Probably Not Worth It (TM).
	 */
	if (probed)
		return -EINVAL;

	base = dev_read_addr_ptr(dev_get_parent(dev));
	if (!base)
		return -EINVAL;

	in0_clk = kzalloc(sizeof(*in0_clk), GFP_KERNEL);
	if (!in0_clk)
		return -ENOMEM;

	ret = clk_get_by_index(dev, 0, in0_clk);
	if (ret)
		return ret;
	in0 = in0_clk->dev->name;

	probed = true;

	aclk_sels[0] = in0;
	pll2_sels[0] = in0;

	/*
	 * All PLLs have a broken bypass, but pll0 has the CPU downstream, so we
	 * need to manually reparent it whenever we configure pll0
	 */
	pll = k210_create_pll(&k210_plls[0], base);
	if (pll) {
		bypass = k210_register_bypass("pll0", in0, &pll->clk,
					      &k210_pll_ops, in0_clk);
		clk_dm(K210_CLK_PLL0, bypass);
	} else {
		return -ENOMEM;
	}

	{
		const struct k210_pll_params *params = &k210_plls[1];

		clk_dm(K210_CLK_PLL1,
		       k210_register_pll("pll1", in0, base + params->off,
					 base + params->lock_off, params->shift,
					 params->width));
	}

	/* PLL2 is muxed, so set up a composite clock */
	mux = k210_create_mux(&k210_muxes[MUXIFY(K210_CLK_PLL2)], base);
	pll = k210_create_pll(&k210_plls[2], base);
	if (!mux || !pll) {
		free(mux);
		free(pll);
	} else {
		clk_dm(K210_CLK_PLL2,
		       clk_register_composite(NULL, "pll2", pll2_sels,
					      ARRAY_SIZE(pll2_sels),
					      &mux->clk, &clk_mux_ops,
					      &pll->clk, &k210_pll_ops,
					      &pll->clk, &k210_pll_ops, 0));
	}

	/* Half-frequency clocks for "even" dividers */
	clk_dm(K210_CLK_IN0_H,  k210_clk_half("in0_half", in0));
	clk_dm(K210_CLK_PLL0_H, k210_clk_half("pll0_half", "pll0"));
	clk_dm(K210_CLK_PLL2_H, k210_clk_half("pll2_half", "pll2"));

	/* ACLK has no gate */
	mux = k210_create_mux(&k210_muxes[MUXIFY(K210_CLK_ACLK)], base);
	div = k210_create_div(&k210_divs[DIVIFY(K210_CLK_ACLK)], base);
	if (!mux || !div) {
		free(mux);
		free(div);
	} else {
		struct clk *aclk =
			clk_register_composite(NULL, "aclk", aclk_sels,
					       ARRAY_SIZE(aclk_sels),
					       &mux->clk, &clk_mux_ops,
					       &div->clk, &clk_divider_ops,
					       NULL, NULL, 0);
		clk_dm(K210_CLK_ACLK, aclk);
		if (!IS_ERR(aclk)) {
			k210_bypass_children = aclk;
			k210_bypass_set_children(bypass,
						 &k210_bypass_children, 1);
		}
	}

#define REGISTER_COMP(id, name) \
	clk_dm(id, \
	       k210_register_comp(&k210_comps[COMPIFY(id)], base, name, NULL))
	REGISTER_COMP(K210_CLK_SPI3,   "spi3");
	REGISTER_COMP(K210_CLK_TIMER0, "timer0");
	REGISTER_COMP(K210_CLK_TIMER1, "timer1");
	REGISTER_COMP(K210_CLK_TIMER2, "timer2");
#undef REGISTER_COMP

	/* Dividing clocks, no mux */
#define REGISTER_COMP_NOMUX(id, name, parent) \
	clk_dm(id, \
	       k210_register_comp(&k210_comps[COMPIFY(id)], base, name, parent))
	REGISTER_COMP_NOMUX(K210_CLK_SRAM0, "sram0", "aclk");
	REGISTER_COMP_NOMUX(K210_CLK_SRAM1, "sram1", "aclk");
	REGISTER_COMP_NOMUX(K210_CLK_ROM,   "rom",   "aclk");
	REGISTER_COMP_NOMUX(K210_CLK_DVP,   "dvp",   "aclk");
	REGISTER_COMP_NOMUX(K210_CLK_APB0,  "apb0",  "aclk");
	REGISTER_COMP_NOMUX(K210_CLK_APB1,  "apb1",  "aclk");
	REGISTER_COMP_NOMUX(K210_CLK_APB2,  "apb2",  "aclk");
	REGISTER_COMP_NOMUX(K210_CLK_AI,    "ai",    "pll1");
	REGISTER_COMP_NOMUX(K210_CLK_I2S0,  "i2s0",  "pll2_half");
	REGISTER_COMP_NOMUX(K210_CLK_I2S1,  "i2s1",  "pll2_half");
	REGISTER_COMP_NOMUX(K210_CLK_I2S2,  "i2s2",  "pll2_half");
	REGISTER_COMP_NOMUX(K210_CLK_WDT0,  "wdt0",  "in0_half");
	REGISTER_COMP_NOMUX(K210_CLK_WDT1,  "wdt1",  "in0_half");
	REGISTER_COMP_NOMUX(K210_CLK_SPI0,  "spi0",  "pll0_half");
	REGISTER_COMP_NOMUX(K210_CLK_SPI1,  "spi1",  "pll0_half");
	REGISTER_COMP_NOMUX(K210_CLK_SPI2,  "spi2",  "pll0_half");
	REGISTER_COMP_NOMUX(K210_CLK_I2C0,  "i2c0",  "pll0_half");
	REGISTER_COMP_NOMUX(K210_CLK_I2C1,  "i2c1",  "pll0_half");
	REGISTER_COMP_NOMUX(K210_CLK_I2C2,  "i2c2",  "pll0_half");
#undef REGISTER_COMP_NOMUX

	/* Dividing clocks */
#define REGISTER_DIV(id, name, parent) do {\
	const struct k210_div_params *params = &k210_divs[DIVIFY(id)]; \
	clk_dm(id, \
	       clk_register_divider(NULL, name, parent, 0, base + params->off, \
				    params->shift, params->width, 0)); \
} while (false)
	REGISTER_DIV(K210_CLK_I2S0_M, "i2s0_m", "pll2_half");
	REGISTER_DIV(K210_CLK_I2S1_M, "i2s1_m", "pll2_half");
	REGISTER_DIV(K210_CLK_I2S2_M, "i2s2_m", "pll2_half");
#undef REGISTER_DIV

	/* Gated clocks */
#define REGISTER_GATE(id, name, parent) do { \
	const struct k210_gate_params *params = &k210_gates[GATEIFY(id)]; \
	clk_dm(id, \
	       clk_register_gate(NULL, name, parent, 0, base + params->off, \
				 params->bit_idx, 0, NULL)); \
} while (false)
	REGISTER_GATE(K210_CLK_CPU,   "cpu",   "aclk");
	REGISTER_GATE(K210_CLK_DMA,   "dma",   "aclk");
	REGISTER_GATE(K210_CLK_FFT,   "fft",   "aclk");
	REGISTER_GATE(K210_CLK_GPIO,  "gpio",  "apb0");
	REGISTER_GATE(K210_CLK_UART1, "uart1", "apb0");
	REGISTER_GATE(K210_CLK_UART2, "uart2", "apb0");
	REGISTER_GATE(K210_CLK_UART3, "uart3", "apb0");
	REGISTER_GATE(K210_CLK_FPIOA, "fpioa", "apb0");
	REGISTER_GATE(K210_CLK_SHA,   "sha",   "apb0");
	REGISTER_GATE(K210_CLK_AES,   "aes",   "apb1");
	REGISTER_GATE(K210_CLK_OTP,   "otp",   "apb1");
	REGISTER_GATE(K210_CLK_RTC,   "rtc",   in0);
#undef REGISTER_GATE

	/* The MTIME register in CLINT runs at one 50th the CPU clock speed */
	clk_dm(K210_CLK_CLINT,
	       clk_register_fixed_factor(NULL, "clint", "cpu", 0, 1, 50));

	return 0;
}

static const struct udevice_id k210_clk_ids[] = {
	{ .compatible = "kendryte,k210-clk" },
	{ },
};

U_BOOT_DRIVER(k210_clk) = {
	.name = "k210_clk",
	.id = UCLASS_CLK,
	.of_match = k210_clk_ids,
	.ops = &k210_clk_ops,
	.probe = k210_clk_probe,
};