[PATCH v6 4/6] pinctrl: freescale: imx: add shared input select reg support

[Adrian Alonso]

- 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 <aalo...@freescale.com>
---
Changes for V2: Resend
Changes for V3:
- Use of_parse_phandle instead of of_get_child_by_name to get input select
  base register address
Changes for V4: Resend
Changes for V5:
- Remove SHARE_INPUT_SELECT_REG flag
- Use fsl,input-sel to check if shared input select register support is used
Changes for V6: Resend

 drivers/pinctrl/freescale/pinctrl-imx.c | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/freescale/pinctrl-imx.c 
b/drivers/pinctrl/freescale/pinctrl-imx.c
index 151d50d..a5bb939 100644
--- a/drivers/pinctrl/freescale/pinctrl-imx.c
+++ b/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;
-- 
2.1.4

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