[PATCH v2 10/23] pinctrl: rockchip: add schmitt input mode support for rv1108
From: andy.yan@rock-chips.com (Andy Yan)
Date: 2017-08-02 08:40:31
Also in:
linux-gpio, linux-rockchip, lkml
Subsystem:
arm/rockchip soc support, pin control subsystem, the rest · Maintainers:
Heiko Stuebner, Linus Walleij, Linus Torvalds
Some pins like i2c SCL/SDA need the schmitt input function to avoid crosstalk problems. Signed-off-by: Andy Yan <andy.yan@rock-chips.com> Reviewed-by: Heiko Stuebner <heiko@sntech.de> --- Changes in v2: None 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[] = {
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2.7.4