pinctrl: rockchip: Add input schmitt support for rk3328

Signed-off-by: David Wu <david.wu@rock-chips.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
index 3723fd43e463..1e276dfe1763 100644
--- a/drivers/pinctrl/pinctrl-rockchip.c
+++ b/drivers/pinctrl/pinctrl-rockchip.c
@@ -1358,6 +1358,28 @@ static int rockchip_set_pull(struct rockchip_pin_bank *bank,
         return ret;
 }
 
+#define RK3328_SCHMITT_BITS_PER_PIN             1
+#define RK3328_SCHMITT_PINS_PER_REG             16
+#define RK3328_SCHMITT_BANK_STRIDE              8
+#define RK3328_SCHMITT_GRF_OFFSET               0x380
+
+static int rk3328_calc_schmitt_reg_and_bit(struct rockchip_pin_bank *bank,
+                                           int pin_num,
+                                           struct regmap **regmap,
+                                           int *reg, u8 *bit)
+{
+        struct rockchip_pinctrl *info = bank->drvdata;
+
+        *regmap = info->regmap_base;
+        *reg = RK3328_SCHMITT_GRF_OFFSET;
+
+        *reg += bank->bank_num * RK3328_SCHMITT_BANK_STRIDE;
+        *reg += ((pin_num / RK3328_SCHMITT_PINS_PER_REG) * 4);
+        *bit = pin_num % RK3328_SCHMITT_PINS_PER_REG;
+
+        return 0;
+}
+
 static int rockchip_get_schmitt(struct rockchip_pin_bank *bank, int pin_num)
 {
         struct rockchip_pinctrl *info = bank->drvdata;
@@ -2861,6 +2883,7 @@ static struct rockchip_pin_ctrl rk3328_pin_ctrl = {
                 .pull_calc_reg          = rk3228_calc_pull_reg_and_bit,
                 .drv_calc_reg           = rk3228_calc_drv_reg_and_bit,
                 .iomux_recalc           = rk3328_recalc_mux,
+                .schmitt_calc_reg       = rk3328_calc_schmitt_reg_and_bit,
 };
 
 static struct rockchip_pin_bank rk3368_pin_banks[] = {