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From 4be9f9082b0a2ac2626ae20b7e07006139827442 Mon Sep 17 00:00:00 2001
From: Samuel Holland <samuel@sholland.org>
Date: Sat, 28 Aug 2021 00:34:54 -0500
Subject: [PATCH 52/90] gpio: axp: Add pull-down support for AXP22x/AXP8xx
variant
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>
---
drivers/gpio/axp_gpio.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
--- a/drivers/gpio/axp_gpio.c
+++ b/drivers/gpio/axp_gpio.c
@@ -24,6 +24,7 @@ struct axp_gpio_desc {
u8 npins;
u8 status_reg;
u8 status_offset;
+ u8 pull_reg;
u8 input_mux;
};
@@ -60,11 +61,22 @@ static int axp_gpio_get_function(struct
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;
else if (flags & GPIOD_IS_OUT_ACTIVE)
@@ -129,6 +141,7 @@ static const struct axp_gpio_desc axp221
.pins = axp221_gpio_pins,
.npins = ARRAY_SIZE(axp221_gpio_pins),
.status_reg = 0x94,
+ .pull_reg = 0x97,
.input_mux = 2,
};
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