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From 37e19d9b8a23c88413dd845dbb3dd58dd3636a6d Mon Sep 17 00:00:00 2001
From: Samuel Holland <samuel@sholland.org>
Date: Sat, 28 Aug 2021 00:36:33 -0500
Subject: [PATCH 51/90] gpio: axp: Add support for getting the pin function
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>
---
drivers/gpio/axp_gpio.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
--- a/drivers/gpio/axp_gpio.c
+++ b/drivers/gpio/axp_gpio.c
@@ -39,6 +39,24 @@ static int axp_gpio_get_value(struct ude
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 ude
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,
};
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