[PATCH 1/4] pinctrl: mediatek: add handling for RSEL register

[David Lechner]

Add a new PINCTRL_PIN_REG_RSEL register type and a new function
mtk_pinconf_bias_set_pu_pd_rsel() to handle setting it.

Some MediaTek SoCs have a pin configuration register called RSEL that
sets the resistance value for bias pullup/pulldown.

Signed-off-by: David Lechner <dlechner at baylibre.com>
---
 drivers/pinctrl/mediatek/pinctrl-mtk-common.c | 14 ++++++++++++++
 drivers/pinctrl/mediatek/pinctrl-mtk-common.h |  3 +++
 2 files changed, 17 insertions(+)

diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
index d152e216634..1028b8a93f5 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
@@ -450,6 +450,20 @@ int mtk_pinconf_bias_set_pupd_r1_r0(struct udevice *dev, u32 pin, bool disable,
 	return 0;
 }
 
+int mtk_pinconf_bias_set_pu_pd_rsel(struct udevice *dev, u32 pin, bool disable,
+				    bool pullup, u32 val)
+{
+	int err;
+
+	/* val is expected to be one of MTK_PULL_SET_RSEL_XXX */
+
+	err = mtk_pinconf_bias_set_pu_pd(dev, pin, disable, pullup, val);
+	if (err)
+		return err;
+
+	return mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_RSEL, val & 0x7);
+}
+
 int mtk_pinconf_bias_set(struct udevice *dev, u32 pin, u32 arg, u32 val)
 {
 	int err;
diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common.h b/drivers/pinctrl/mediatek/pinctrl-mtk-common.h
index 58f13613633..1215fb7094b 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common.h
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common.h
@@ -67,6 +67,7 @@ enum {
 	PINCTRL_PIN_REG_PUPD,
 	PINCTRL_PIN_REG_R0,
 	PINCTRL_PIN_REG_R1,
+	PINCTRL_PIN_REG_RSEL,
 	PINCTRL_PIN_REG_MAX,
 };
 
@@ -253,6 +254,8 @@ int mtk_pinconf_bias_set_pullen_pullsel(struct udevice *dev, u32 pin,
 					bool disable, bool pullup, u32 val);
 int mtk_pinconf_bias_set_pupd_r1_r0(struct udevice *dev, u32 pin, bool disable,
 				    bool pullup, u32 val);
+int mtk_pinconf_bias_set_pu_pd_rsel(struct udevice *dev, u32 pin, bool disable,
+				    bool pullup, u32 val);
 int mtk_pinconf_bias_set_v0(struct udevice *dev, u32 pin, bool disable,
 			    bool pullup, u32 val);
 int mtk_pinconf_bias_set_v1(struct udevice *dev, u32 pin, bool disable,

-- 
2.43.0