pinctrl: mxs: Add support for i.MX2[38] mxs pinctrl driver
The code responsible for setting proper values in the MUX registers
(in the mxs_pinctrl_set_state()) has been ported from Linux kernel
- SHA1: 17bb763e7eaf tag v5.1.11 from linux-stable.
As the pinctrl node in the imx28.dtsi file has gpio pins nodes as subnodes,
it was necessary to use 'dm_scan_fdt_dev()' (as a .bind method) to also
make them 'visible' by the DM's "gpio_mxs" driver.
Signed-off-by: Lukasz Majewski <lukma@denx.de>
Reviewed-by: Marek Vasut <marex@denx.de>
diff --git a/drivers/pinctrl/nxp/pinctrl-mxs.h b/drivers/pinctrl/nxp/pinctrl-mxs.h
new file mode 100644
index 0000000..a398e43
--- /dev/null
+++ b/drivers/pinctrl/nxp/pinctrl-mxs.h
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2012 Freescale Semiconductor, Inc.
+ */
+
+#ifndef __PINCTRL_MXS_H
+#define __PINCTRL_MXS_H
+
+#include <dm/pinctrl.h>
+
+#define SET 0x4
+#define CLR 0x8
+#define TOG 0xc
+
+#define MXS_PINCTRL_PIN(pin) PINCTRL_PIN(pin, #pin)
+#define PINID(bank, pin) ((bank) * 32 + (pin))
+
+/*
+ * pinmux-id bit field definitions
+ *
+ * bank: 15..12 (4)
+ * pin: 11..4 (8)
+ * muxsel: 3..0 (4)
+ */
+#define MUXID_TO_PINID(m) PINID((m) >> 12 & 0xf, (m) >> 4 & 0xff)
+#define MUXID_TO_MUXSEL(m) ((m) & 0xf)
+
+#define PINID_TO_BANK(p) ((p) >> 5)
+#define PINID_TO_PIN(p) ((p) % 32)
+
+/*
+ * pin config bit field definitions
+ *
+ * pull-up: 6..5 (2)
+ * voltage: 4..3 (2)
+ * mA: 2..0 (3)
+ *
+ * MSB of each field is presence bit for the config.
+ */
+#define PULL_PRESENT (1 << 6)
+#define PULL_SHIFT 5
+#define VOL_PRESENT (1 << 4)
+#define VOL_SHIFT 3
+#define MA_PRESENT (1 << 2)
+#define MA_SHIFT 0
+#define CONFIG_TO_PULL(c) ((c) >> PULL_SHIFT & 0x1)
+#define CONFIG_TO_VOL(c) ((c) >> VOL_SHIFT & 0x1)
+#define CONFIG_TO_MA(c) ((c) >> MA_SHIFT & 0x3)
+
+struct mxs_regs {
+ u16 muxsel;
+ u16 drive;
+ u16 pull;
+};
+
+static inline void mxs_pinctrl_rmwl(u32 value, u32 mask, u8 shift,
+ void __iomem *reg)
+{
+ clrsetbits_le32(reg, mask << shift, value << shift);
+}
+#endif /* __PINCTRL_MXS_H */