[PATCH 5/6] pinctrl: rockchip: support unrouted iomuxes per bank

[heiko@sntech.de (Heiko Stübner)]

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>
---
 drivers/pinctrl/pinctrl-rockchip.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
index 115c75d..c8920f5 100644
--- 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,
-- 
1.9.0