pinctrl: spear: spear: Convert to regmap

Resources need to be shared between pinmux and plgpio.

Use regmap (syscon) to access resources to allow an
easy way to share resources.

Signed-off-by: Herve Codina <[e-mail]>
Acked-by: Viresh Kumar <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Linus Walleij <[e-mail]>

drivers/pinctrl/spear/pinctrl-spear.c

···
  */
 
 #include <linux/err.h>
+#include <linux/mfd/syscon.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
···
 	if (!pmx)
 		return -ENOMEM;
 
-	pmx->vbase = devm_platform_ioremap_resource(pdev, 0);
-	if (IS_ERR(pmx->vbase))
-		return PTR_ERR(pmx->vbase);
+	pmx->regmap = device_node_to_regmap(np);
+	if (IS_ERR(pmx->regmap)) {
+		dev_err(&pdev->dev, "Init regmap failed (%pe).\n",
+			pmx->regmap);
+		return PTR_ERR(pmx->regmap);
+	}
 
 	pmx->dev = &pdev->dev;
 	pmx->machdata = machdata;

drivers/pinctrl/spear/pinctrl-spear.h

···
 #include <linux/gpio/driver.h>
 #include <linux/io.h>
 #include <linux/pinctrl/pinctrl.h>
+#include <linux/regmap.h>
 #include <linux/types.h>
 
 struct platform_device;
···
  * @dev: pointer to struct dev of platform_device registered
  * @pctl: pointer to struct pinctrl_dev
  * @machdata: pointer to SoC or machine specific structure
- * @vbase: virtual base address of pinmux controller
+ * @regmap: regmap of pinmux controller
  */
 struct spear_pmx {
 	struct device *dev;
 	struct pinctrl_dev *pctl;
 	struct spear_pinctrl_machdata *machdata;
-	void __iomem *vbase;
+	struct regmap *regmap;
 };
 
 /* exported routines */
 static inline u32 pmx_readl(struct spear_pmx *pmx, u32 reg)
 {
-	return readl_relaxed(pmx->vbase + reg);
+	u32 val;
+
+	regmap_read(pmx->regmap, reg, &val);
+	return val;
 }
 
 static inline void pmx_writel(struct spear_pmx *pmx, u32 val, u32 reg)
 {
-	writel_relaxed(val, pmx->vbase + reg);
+	regmap_write(pmx->regmap, reg, val);
 }
 
 void pmx_init_addr(struct spear_pinctrl_machdata *machdata, u16 reg);