Some pins like i2c SCL/SDA need the schmitt input function
to avoid crosstalk problems.
Signed-off-by: Andy Yan <andy.yan@xxxxxxxxxxxxxx>
---
drivers/pinctrl/pinctrl-rockchip.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
index e831647..868cb9c 100644
--- a/drivers/pinctrl/pinctrl-rockchip.c
+++ b/drivers/pinctrl/pinctrl-rockchip.c
@@ -1084,6 +1084,36 @@ static void rv1108_calc_drv_reg_and_bit(struct rockchip_pin_bank *bank,
*bit *= RV1108_DRV_BITS_PER_PIN;
}
+#define RV1108_SCHMITT_PMU_OFFSET 0x30
+#define RV1108_SCHMITT_GRF_OFFSET 0x388
+#define RV1108_SCHMITT_BANK_STRIDE 8
+#define RV1108_SCHMITT_PINS_PER_GRF_REG 16
+#define RV1108_SCHMITT_PINS_PER_PMU_REG 8
+
+static int rv1108_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;
+ int pins_per_reg;
+
+ if (bank->bank_num == 0) {
+ *regmap = info->regmap_pmu;
+ *reg = RV1108_SCHMITT_PMU_OFFSET;
+ pins_per_reg = RV1108_SCHMITT_PINS_PER_PMU_REG;
+ } else {
+ *regmap = info->regmap_base;
+ *reg = RV1108_SCHMITT_GRF_OFFSET;
+ pins_per_reg = RV1108_SCHMITT_PINS_PER_GRF_REG;
+ *reg += (bank->bank_num - 1) * RV1108_SCHMITT_BANK_STRIDE;
+ }
+ *reg += ((pin_num / pins_per_reg) * 4);
+ *bit = pin_num % pins_per_reg;
+
+ return 0;
+}
+
#define RK2928_PULL_OFFSET 0x118
#define RK2928_PULL_PINS_PER_REG 16
#define RK2928_PULL_BANK_STRIDE 8
@@ -3017,6 +3047,7 @@ static struct rockchip_pin_ctrl rv1108_pin_ctrl = {
.pmu_mux_offset = 0x0,
.pull_calc_reg = rv1108_calc_pull_reg_and_bit,
.drv_calc_reg = rv1108_calc_drv_reg_and_bit,
+ .schmitt_calc_reg = rv1108_calc_schmitt_reg_and_bit,
};
static struct rockchip_pin_bank rk2928_pin_banks[] = {
--
2.7.4
--
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