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50 lines
1.6 KiB
Diff
50 lines
1.6 KiB
Diff
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From 37e19d9b8a23c88413dd845dbb3dd58dd3636a6d Mon Sep 17 00:00:00 2001
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From: Samuel Holland <samuel@sholland.org>
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Date: Sat, 28 Aug 2021 00:36:33 -0500
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Subject: [PATCH 51/90] gpio: axp: Add support for getting the pin function
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Implement the .get_function operation, so the gpio command can report
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the current function. Since the GPIOF_FUNC (versus GPIOF_UNUSED) mux
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values vary among the PMICs, report all non-GPIO mux values as UNKNOWN.
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Signed-off-by: Samuel Holland <samuel@sholland.org>
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---
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drivers/gpio/axp_gpio.c | 19 +++++++++++++++++++
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1 file changed, 19 insertions(+)
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--- a/drivers/gpio/axp_gpio.c
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+++ b/drivers/gpio/axp_gpio.c
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@@ -39,6 +39,24 @@ static int axp_gpio_get_value(struct ude
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return !!(ret & BIT(desc->status_offset + pin));
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}
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+static int axp_gpio_get_function(struct udevice *dev, unsigned pin)
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+{
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+ const struct axp_gpio_desc *desc = dev_get_priv(dev);
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+ int ret;
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+
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+ ret = pmic_reg_read(dev->parent, desc->pins[pin]);
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+ if (ret < 0)
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+ return ret;
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+
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+ ret &= AXP_GPIO_CTRL_MASK;
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+ if (ret == desc->input_mux)
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+ return GPIOF_INPUT;
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+ if (ret == AXP_GPIO_CTRL_OUTPUT_HIGH || ret == AXP_GPIO_CTRL_OUTPUT_LOW)
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+ return GPIOF_OUTPUT;
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+
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+ return GPIOF_UNKNOWN;
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+}
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+
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static int axp_gpio_set_flags(struct udevice *dev, unsigned pin, ulong flags)
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{
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const struct axp_gpio_desc *desc = dev_get_priv(dev);
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@@ -60,6 +78,7 @@ static int axp_gpio_set_flags(struct ude
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static const struct dm_gpio_ops axp_gpio_ops = {
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.get_value = axp_gpio_get_value,
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+ .get_function = axp_gpio_get_function,
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.xlate = gpio_xlate_offs_flags,
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.set_flags = axp_gpio_set_flags,
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};
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