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gpio: axp: Add support for getting the pin function

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Implement the .get_function operation, so the gpio command can report
the current function. Since the GPIOF_FUNC (versus GPIOF_UNUSED) mux
values vary among the PMICs, report all non-GPIO mux values as UNKNOWN.

Signed-off-by: Samuel Holland <samuel@sholland.org>
This commit is contained in:
Samuel Holland 2021-08-28 00:36:33 -05:00
parent a3a6dde671
commit 646df59cdc
1 changed files with 19 additions and 0 deletions
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19
drivers/gpio/axp_gpio.c
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@ -39,6 +39,24 @@ static int axp_gpio_get_value(struct udevice *dev, unsigned pin)
return !!(ret & BIT(desc->status_offset + pin));
}
static int axp_gpio_get_function(struct udevice *dev, unsigned pin)
{
const struct axp_gpio_desc *desc = dev_get_priv(dev);
int ret;
ret = pmic_reg_read(dev->parent, desc->pins[pin]);
if (ret < 0)
return ret;
ret &= AXP_GPIO_CTRL_MASK;
if (ret == desc->input_mux)
return GPIOF_INPUT;
if (ret == AXP_GPIO_CTRL_OUTPUT_HIGH || ret == AXP_GPIO_CTRL_OUTPUT_LOW)
return GPIOF_OUTPUT;
return GPIOF_UNKNOWN;
}
static int axp_gpio_set_flags(struct udevice *dev, unsigned pin, ulong flags)
{
const struct axp_gpio_desc *desc = dev_get_priv(dev);
@ -60,6 +78,7 @@ static int axp_gpio_set_flags(struct udevice *dev, unsigned pin, ulong flags)
static const struct dm_gpio_ops axp_gpio_ops = {
.get_value = axp_gpio_get_value,
.get_function = axp_gpio_get_function,
.xlate = gpio_xlate_offs_flags,
.set_flags = axp_gpio_set_flags,
};