pinctrl: rockchip: support unrouted iomuxes per bank

On the upcoming RK3288 SoC contain some unrouted pins in their banks. So while
for example pin8 of bank5 stays pin8 with all its settings (register offset etc),
pins 0 to 7 are not routed outside the SoC at all.
Therefore add a flag to mark these unrouted iomuxes to prevent people from using
them.

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

diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
index cfdeb81..65b7321 100644 (file)
--- a/drivers/pinctrl/pinctrl-rockchip.c
+++ b/drivers/pinctrl/pinctrl-rockchip.c
@@ -70,6 +70,7 @@ enum rockchip_pinctrl_type {
 #define IOMUX_GPIO_ONLY                BIT(0)
 #define IOMUX_WIDTH_4BIT       BIT(1)
 #define IOMUX_SOURCE_PMU       BIT(2)
+#define IOMUX_UNROUTED         BIT(3)
 
 /**
  * @type: iomux variant using IOMUX_* constants
@@ -386,6 +387,11 @@ static int rockchip_get_mux(struct rockchip_pin_bank *bank, int pin)
        if (iomux_num > 3)
                return -EINVAL;
 
+       if (bank->iomux[iomux_num].type & IOMUX_UNROUTED) {
+               dev_err(info->dev, "pin %d is unrouted\n", pin);
+               return -EINVAL;
+       }
+
        if (bank->iomux[iomux_num].type & IOMUX_GPIO_ONLY)
                return RK_FUNC_GPIO;
 
@@ -436,6 +442,11 @@ static int rockchip_set_mux(struct rockchip_pin_bank *bank, int pin, int mux)
        if (iomux_num > 3)
                return -EINVAL;
 
+       if (bank->iomux[iomux_num].type & IOMUX_UNROUTED) {
+               dev_err(info->dev, "pin %d is unrouted\n", pin);
+               return -EINVAL;
+       }
+
        if (bank->iomux[iomux_num].type & IOMUX_GPIO_ONLY) {
                if (mux != RK_FUNC_GPIO) {
                        dev_err(info->dev,