pinctrl: rockchip: add return value to rockchip_set_mux

In a following change, rockchip_set_mux gets the possibility to fail.
Therefore add a return value to it and honor error codes in functions
using rockchip_set_mux.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 25 insertions, 7 deletions

diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
index 23e8812d3115..2ac194370b73 100644
--- a/drivers/pinctrl/pinctrl-rockchip.c
+++ b/drivers/pinctrl/pinctrl-rockchip.c
@@ -342,7 +342,7 @@ static const struct pinctrl_ops rockchip_pctrl_ops = {
  * @pin: pin to change
  * @mux: new mux function to set
  */
-static void rockchip_set_mux(struct rockchip_pin_bank *bank, int pin, int mux)
+static int rockchip_set_mux(struct rockchip_pin_bank *bank, int pin, int mux)
 {
         struct rockchip_pinctrl *info = bank->drvdata;
         void __iomem *reg = info->reg_base + info->ctrl->mux_offset;
@@ -365,6 +365,8 @@ static void rockchip_set_mux(struct rockchip_pin_bank *bank, int pin, int mux)
         writel(data, reg);
 
         spin_unlock_irqrestore(&bank->slock, flags);
+
+        return 0;
 }
 
 #define RK2928_PULL_OFFSET              0x118
@@ -560,7 +562,7 @@ static int rockchip_pmx_enable(struct pinctrl_dev *pctldev, unsigned selector,
         const unsigned int *pins = info->groups[group].pins;
         const struct rockchip_pin_config *data = info->groups[group].data;
         struct rockchip_pin_bank *bank;
-        int cnt;
+        int cnt, ret = 0;
 
         dev_dbg(info->dev, "enable function %s group %s\n",
                 info->functions[selector].name, info->groups[group].name);
@@ -571,8 +573,18 @@ static int rockchip_pmx_enable(struct pinctrl_dev *pctldev, unsigned selector,
          */
         for (cnt = 0; cnt < info->groups[group].npins; cnt++) {
                 bank = pin_to_bank(info, pins[cnt]);
-                rockchip_set_mux(bank, pins[cnt] - bank->pin_base,
-                                 data[cnt].func);
+                ret = rockchip_set_mux(bank, pins[cnt] - bank->pin_base,
+                                       data[cnt].func);
+                if (ret)
+                        break;
+        }
+
+        if (ret) {
+                /* revert the already done pin settings */
+                for (cnt--; cnt >= 0; cnt--)
+                        rockchip_set_mux(bank, pins[cnt] - bank->pin_base, 0);
+
+                return ret;
         }
 
         return 0;
@@ -607,7 +619,7 @@ static int rockchip_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
         struct rockchip_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
         struct rockchip_pin_bank *bank;
         struct gpio_chip *chip;
-        int pin;
+        int pin, ret;
         u32 data;
 
         chip = range->gc;
@@ -617,7 +629,9 @@ static int rockchip_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
         dev_dbg(info->dev, "gpio_direction for pin %u as %s-%d to %s\n",
                  offset, range->name, pin, input ? "input" : "output");
 
-        rockchip_set_mux(bank, pin, RK_FUNC_GPIO);
+        ret = rockchip_set_mux(bank, pin, RK_FUNC_GPIO);
+        if (ret < 0)
+                return ret;
 
         data = readl_relaxed(bank->reg_base + GPIO_SWPORT_DDR);
         /* set bit to 1 for output, 0 for input */
@@ -1144,9 +1158,13 @@ static int rockchip_irq_set_type(struct irq_data *d, unsigned int type)
         u32 polarity;
         u32 level;
         u32 data;
+        int ret;
 
         /* make sure the pin is configured as gpio input */
-        rockchip_set_mux(bank, d->hwirq, RK_FUNC_GPIO);
+        ret = rockchip_set_mux(bank, d->hwirq, RK_FUNC_GPIO);
+        if (ret < 0)
+                return ret;
+
         data = readl_relaxed(bank->reg_base + GPIO_SWPORT_DDR);
         data &= ~mask;
         writel_relaxed(data, bank->reg_base + GPIO_SWPORT_DDR);