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pinctrl: rockchip：Add input schmitt support 

To prevent external signal crosstalk, some pins need to
enable input schmitt, like i2c pins, 32k-input pin and so on.

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>
hifive-unleashed-5.1
david.wu 2017-03-02 15:11:23 +08:00 committed by Linus Walleij
parent 9396f44153
commit e3b357d7df
1 changed files with 73 additions and 0 deletions
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73
drivers/pinctrl/pinctrl-rockchip.c
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@ -308,6 +308,9 @@ struct rockchip_pin_ctrl {
int *reg, u8 *bit);
void (*iomux_recalc)(u8 bank_num, int pin, int *reg,
u8 *bit, int *mask);
int (*schmitt_calc_reg)(struct rockchip_pin_bank *bank,
int pin_num, struct regmap **regmap,
int *reg, u8 *bit);
};
struct rockchip_pin_config {
@ -1355,6 +1358,57 @@ static int rockchip_set_pull(struct rockchip_pin_bank *bank,
return ret;
}
static int rockchip_get_schmitt(struct rockchip_pin_bank *bank, int pin_num)
{
struct rockchip_pinctrl *info = bank->drvdata;
struct rockchip_pin_ctrl *ctrl = info->ctrl;
struct regmap *regmap;
int reg, ret;
u8 bit;
u32 data;
ret = ctrl->schmitt_calc_reg(bank, pin_num, &regmap, &reg, &bit);
if (ret)
return ret;
ret = regmap_read(regmap, reg, &data);
if (ret)
return ret;
data >>= bit;
return data & 0x1;
}
static int rockchip_set_schmitt(struct rockchip_pin_bank *bank,
int pin_num, int enable)
{
struct rockchip_pinctrl *info = bank->drvdata;
struct rockchip_pin_ctrl *ctrl = info->ctrl;
struct regmap *regmap;
int reg, ret;
unsigned long flags;
u8 bit;
u32 data, rmask;
dev_dbg(info->dev, "setting input schmitt of GPIO%d-%d to %d\n",
bank->bank_num, pin_num, enable);
ret = ctrl->schmitt_calc_reg(bank, pin_num, &regmap, &reg, &bit);
if (ret)
return ret;
spin_lock_irqsave(&bank->slock, flags);
/* enable the write to the equivalent lower bits */
data = BIT(bit + 16) | (enable << bit);
rmask = BIT(bit + 16) | BIT(bit);
ret = regmap_update_bits(regmap, reg, rmask, data);
spin_unlock_irqrestore(&bank->slock, flags);
return ret;
}
/*
* Pinmux_ops handling
*/
@ -1574,6 +1628,15 @@ static int rockchip_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
if (rc < 0)
return rc;
break;
case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
if (!info->ctrl->schmitt_calc_reg)
return -ENOTSUPP;
rc = rockchip_set_schmitt(bank,
pin - bank->pin_base, arg);
if (rc < 0)
return rc;
break;
default:
return -ENOTSUPP;
break;
@ -1632,6 +1695,16 @@ static int rockchip_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
if (rc < 0)
return rc;
arg = rc;
break;
case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
if (!info->ctrl->schmitt_calc_reg)
return -ENOTSUPP;
rc = rockchip_get_schmitt(bank, pin - bank->pin_base);
if (rc < 0)
return rc;
arg = rc;
break;
default: