diff options
| author | Andy Yan <andy.yan@rock-chips.com> | 2017-07-31 18:10:22 +0800 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2017-08-14 15:01:02 +0200 |
| commit | 5caff7eabcd299d282232011de1cc83d5b0fa6c1 (patch) | |
| tree | 4dd3eb3cd9e0e367667f3dbe641531a6a488d4e6 /drivers/pinctrl | |
| parent | 29ddbb8101b267b3b8b4a8708bf228fc4c182df6 (diff) | |
| download | linux-5caff7eabcd299d282232011de1cc83d5b0fa6c1.tar.bz2 | |
pinctrl: rockchip: add input schmitt support for rv1108
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>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl')
| -rw-r--r-- | drivers/pinctrl/pinctrl-rockchip.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c index 7ba0c40064e4..c6f472e1bca6 100644 --- a/drivers/pinctrl/pinctrl-rockchip.c +++ b/drivers/pinctrl/pinctrl-rockchip.c @@ -1172,6 +1172,36 @@ 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 @@ -3134,6 +3164,7 @@ 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[] = { |