pinctrl: freescale: imx: add shared input select reg support

- Add shared input select register support
- imx7d has two iomux controllers iomuxc and iomuxc-lpsr
  which share select_input register for daisy chain settings
Signed-off-by: Adrian Alonso <aalonso@freescale.com>
Acked-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/freescale/pinctrl-imx.c

@@ -18,6 +18,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/of_address.h>
 #include <linux/pinctrl/machine.h>
 #include <linux/pinctrl/pinconf.h>
 #include <linux/pinctrl/pinctrl.h>
@@ -39,6 +40,7 @@ struct imx_pinctrl {
 	struct device *dev;
 	struct pinctrl_dev *pctl;
 	void __iomem *base;
+	void __iomem *input_sel_base;
 	const struct imx_pinctrl_soc_info *info;
 };
 
@@ -254,7 +256,12 @@ static int imx_pmx_set(struct pinctrl_dev *pctldev, unsigned selector,
 			 * Regular select input register can never be at offset
 			 * 0, and we only print register value for regular case.
 			 */
-			writel(pin->input_val, ipctl->base + pin->input_reg);
+			if (ipctl->input_sel_base)
+				writel(pin->input_val, ipctl->input_sel_base +
+						pin->input_reg);
+			else
+				writel(pin->input_val, ipctl->base +
+						pin->input_reg);
 			dev_dbg(ipctl->dev,
 				"==>select_input: offset 0x%x val 0x%x\n",
 				pin->input_reg, pin->input_val);
@@ -685,6 +692,8 @@ static int imx_pinctrl_probe_dt(struct platform_device *pdev,
 int imx_pinctrl_probe(struct platform_device *pdev,
 		      struct imx_pinctrl_soc_info *info)
 {
+	struct device_node *dev_np = pdev->dev.of_node;
+	struct device_node *np;
 	struct imx_pinctrl *ipctl;
 	struct resource *res;
 	int ret, i;
@@ -715,6 +724,23 @@ int imx_pinctrl_probe(struct platform_device *pdev,
 	if (IS_ERR(ipctl->base))
 		return PTR_ERR(ipctl->base);
 
+	if (of_property_read_bool(dev_np, "fsl,input-sel")) {
+		np = of_parse_phandle(dev_np, "fsl,input-sel", 0);
+		if (np) {
+			ipctl->input_sel_base = of_iomap(np, 0);
+			if (IS_ERR(ipctl->input_sel_base)) {
+				of_node_put(np);
+				dev_err(&pdev->dev,
+					"iomuxc input select base address not found\n");
+				return PTR_ERR(ipctl->input_sel_base);
+			}
+		} else {
+			dev_err(&pdev->dev, "iomuxc fsl,input-sel property not found\n");
+			return -EINVAL;
+		}
+		of_node_put(np);
+	}
+
 	imx_pinctrl_desc.name = dev_name(&pdev->dev);
 	imx_pinctrl_desc.pins = info->pins;
 	imx_pinctrl_desc.npins = info->npins;