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gpio: axp: Add pull-down support for AXP22x/AXP8xx variant

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The AXP221 and newer PMICs support a pull-down function on their GPIOs.
Add support for it.

Signed-off-by: Samuel Holland <samuel@sholland.org>
This commit is contained in:
Samuel Holland 2021-08-28 00:34:54 -05:00
parent 071d04bb86
commit 0c91ce4c05
1 changed files with 14 additions and 1 deletions
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15
drivers/gpio/axp_gpio.c
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@ -25,6 +25,7 @@ struct axp_gpio_desc {
u8 npins;
u8 status_reg;
u8 status_offset;
u8 pull_reg;
u8 input_mux;
};
@ -61,10 +62,21 @@ static int axp_gpio_get_function(struct udevice *dev, unsigned pin)
static int axp_gpio_set_flags(struct udevice *dev, unsigned pin, ulong flags)
{
const struct axp_gpio_desc *desc = dev_get_priv(dev);
bool pull_down = flags & GPIOD_PULL_DOWN;
int ret;
u8 mux;
if (flags & (GPIOD_MASK_DSTYPE | GPIOD_MASK_PULL))
if (flags & (GPIOD_MASK_DSTYPE | GPIOD_PULL_UP))
return -EINVAL;
if (pull_down && !desc->pull_reg)
return -EINVAL;
if (desc->pull_reg) {
ret = pmic_clrsetbits(dev->parent, desc->pull_reg,
BIT(pin), pull_down ? BIT(pin) : 0);
if (ret)
return ret;
}
if (flags & GPIOD_IS_IN)
mux = desc->input_mux;
@ -130,6 +142,7 @@ static const struct axp_gpio_desc axp221_gpio_desc = {
.pins = axp221_gpio_pins,
.npins = ARRAY_SIZE(axp221_gpio_pins),
.status_reg = 0x94,
.pull_reg = 0x97,
.input_mux = 2,
};