pinctrl: imx: Introduce pinctrl driver for i.MX6

Introduce pinctrl for i.MX6
1. pinctrl-imx.c is for common usage. It's used by i.MX6/7.
2. Add PINCTRL_IMX PINCTRL_IMX6 Kconfig entry.
3. To the pinctrl_ops implementation, only set_state is implemented.
   To i.MX6/7, the pinctrl dts entry is as following:
&iomuxc {
        pinctrl-names = "default";

        pinctrl_csi1: csi1grp {
                fsl,pins = <
                MX6UL_PAD_CSI_MCLK__CSI_MCLK            0x1b088
                MX6UL_PAD_CSI_PIXCLK__CSI_PIXCLK        0x1b088
                MX6UL_PAD_CSI_VSYNC__CSI_VSYNC          0x1b088
                >;
        };

        [.....]
};
  there is no property named function or groups. So pinctrl_generic_set_state
  can not be used here.
5. This driver is a simple implementation for i.mx iomux controller,
   only parse the fsl,pins property and write value to registers.
6. With DEBUG enabled, we can see log when "i2c bus 0":
   "
   set_state_simple op missing
   imx_pinctrl_set_state: i2c1grp
   mux_reg 0x14c, conf_reg 0x3bc, input_reg 0x5d8, mux_mode 0x0, input_val 0x1, config_val 0x4000007f
   write mux: offset 0x14c val 0x10
   select_input: offset 0x5d8 val 0x1
   write config: offset 0x3bc val 0x7f
   mux_reg 0x148, conf_reg 0x3b8, input_reg 0x5d4, mux_mode 0x0, input_val 0x1, config_val 0x4000007f
   write mux: offset 0x148 val 0x10
   select_input: offset 0x5d4 val 0x1
   write config: offset 0x3b8 val 0x7f
   "
   this means imx6 pinctrl driver works as expected.

Signed-off-by: Peng Fan <van.freenix@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

1 files changed, 50 insertions, 0 deletions

diff --git a/drivers/pinctrl/nxp/pinctrl-imx.h b/drivers/pinctrl/nxp/pinctrl-imx.h
new file mode 100644
index 0000000000..037c491580
--- /dev/null
+++ b/drivers/pinctrl/nxp/pinctrl-imx.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2016 Peng Fan <van.freenix@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __DRIVERS_PINCTRL_IMX_H
+#define __DRIVERS_PINCTRL_IMX_H
+
+/**
+ * @base: the address to the controller in virtual memory
+ * @input_sel_base: the address of the select input in virtual memory.
+ * @flags: flags specific for each soc
+ */
+struct imx_pinctrl_soc_info {
+	void __iomem *base;
+	void __iomem *input_sel_base;
+	unsigned int flags;
+};
+
+/**
+ * @dev: a pointer back to containing device
+ * @info: the soc info
+ */
+struct imx_pinctrl_priv {
+	struct udevice *dev;
+	struct imx_pinctrl_soc_info *info;
+};
+
+extern const struct pinctrl_ops imx_pinctrl_ops;
+
+#define IMX_NO_PAD_CTL	0x80000000	/* no pin config need */
+#define IMX_PAD_SION	0x40000000	/* set SION */
+
+/*
+ * Each pin represented in fsl,pins consists of 5 u32 PIN_FUNC_ID and
+ * 1 u32 CONFIG, so 24 types in total for each pin.
+ */
+#define FSL_PIN_SIZE		24
+#define SHARE_FSL_PIN_SIZE	20
+
+#define SHARE_MUX_CONF_REG	0x1
+#define ZERO_OFFSET_VALID	0x2
+
+#define IOMUXC_CONFIG_SION	(0x1 << 4)
+
+int imx_pinctrl_probe(struct udevice *dev, struct imx_pinctrl_soc_info *info);
+
+int imx_pinctrl_remove(struct udevice *dev);
+#endif /* __DRIVERS_PINCTRL_IMX_H */