pinctrl: imx: Support i.MX7D

Introudce i.MX7 pinctrl driver support.
For now only i.MX7D supported.
There are two iomux controllers in i.MX7D, iomuxc and iomuxc_lpsr.
To iomuxc_lpsr, ZERO_OFFSET_VALID is set, means offset of mux_reg
and conf_reg can begin at 0.

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

drivers/pinctrl/nxp/Kconfig

@@ -14,3 +14,17 @@ config PINCTRL_IMX6
 	  configuration. This driver is different from the linux one,
 	  this is a simple implementation, only parses the 'fsl,pins'
 	  property and configure related registers.
+
+config PINCTRL_IMX7
+	bool "IMX7 pinctrl driver"
+	depends on ARCH_MX7 && PINCTRL_FULL
+	select DEVRES
+	select PINCTRL_IMX
+	help
+	  Say Y here to enable the imx7 pinctrl driver
+
+	  This provides a simple pinctrl driver for i.MX7 SoC familiy,
+	  i.MX7D. This feature depends on device tree
+	  configuration. This driver is different from the linux one,
+	  this is a simple implementation, only parses the 'fsl,pins'
+	  property and configure related registers.

drivers/pinctrl/nxp/Makefile

@@ -1,2 +1,3 @@
 obj-$(CONFIG_PINCTRL_IMX)		+= pinctrl-imx.o
 obj-$(CONFIG_PINCTRL_IMX6)		+= pinctrl-imx6.o
+obj-$(CONFIG_PINCTRL_IMX7)		+= pinctrl-imx7.o

drivers/pinctrl/nxp/pinctrl-imx7.c

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2016 Peng Fan <van.freenix@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <dm/device.h>
+#include <dm/pinctrl.h>
+
+#include "pinctrl-imx.h"
+
+static struct imx_pinctrl_soc_info imx7_pinctrl_soc_info;
+
+static struct imx_pinctrl_soc_info imx7_lpsr_pinctrl_soc_info = {
+	.flags = ZERO_OFFSET_VALID,
+};
+
+static int imx7_pinctrl_probe(struct udevice *dev)
+{
+	struct imx_pinctrl_soc_info *info =
+		(struct imx_pinctrl_soc_info *)dev_get_driver_data(dev);
+
+	return imx_pinctrl_probe(dev, info);
+}
+
+static const struct udevice_id imx7_pinctrl_match[] = {
+	{ .compatible = "fsl,imx7d-iomuxc", .data = (ulong)&imx7_pinctrl_soc_info },
+	{ .compatible = "fsl,imx7d-iomuxc-lpsr", .data = (ulong)&imx7_lpsr_pinctrl_soc_info },
+	{ /* sentinel */ }
+};
+
+U_BOOT_DRIVER(imx7_pinctrl) = {
+	.name = "imx7-pinctrl",
+	.id = UCLASS_PINCTRL,
+	.of_match = of_match_ptr(imx7_pinctrl_match),
+	.probe = imx7_pinctrl_probe,
+	.remove = imx_pinctrl_remove,
+	.priv_auto_alloc_size = sizeof(struct imx_pinctrl_priv),
+	.ops = &imx_pinctrl_ops,
+	.flags = DM_FLAG_PRE_RELOC,
+};