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>
This commit is contained in:
parent
9396f44153
commit
e3b357d7df
|
@ -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, ®map, ®, &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, ®map, ®, &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:
|
||||
|
|
Loading…
Reference in a new issue