as3722_gpio.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2014 NVIDIA Corporation
*/
#include <common.h>
#include <dm.h>
#include <asm/gpio.h>
#include <power/as3722.h>
#include <power/pmic.h>
#define NUM_GPIOS 8
int as3722_gpio_configure(struct udevice *pmic, unsigned int gpio,
unsigned long flags)
{
u8 value = 0;
int err;
if (flags & AS3722_GPIO_OUTPUT_VDDH)
value |= AS3722_GPIO_CONTROL_MODE_OUTPUT_VDDH;
if (flags & AS3722_GPIO_INVERT)
value |= AS3722_GPIO_CONTROL_INVERT;
err = pmic_reg_write(pmic, AS3722_GPIO_CONTROL(gpio), value);
if (err) {
pr_err("failed to configure GPIO#%u: %d\n", gpio, err);
return err;
}
return 0;
}
static int as3722_gpio_set_value(struct udevice *dev, unsigned int gpio,
int level)
{
struct udevice *pmic = dev_get_parent(dev);
const char *l;
u8 value;
int err;
if (gpio >= NUM_GPIOS)
return -EINVAL;
err = pmic_reg_read(pmic, AS3722_GPIO_SIGNAL_OUT);
if (err < 0) {
pr_err("failed to read GPIO signal out register: %d\n", err);
return err;
}
value = err;
if (level == 0) {
value &= ~(1 << gpio);
l = "low";
} else {
value |= 1 << gpio;
l = "high";
}
err = pmic_reg_write(pmic, AS3722_GPIO_SIGNAL_OUT, value);
if (err) {
pr_err("failed to set GPIO#%u %s: %d\n", gpio, l, err);
return err;
}
return 0;
}
int as3722_gpio_direction_output(struct udevice *dev, unsigned int gpio,
int value)
{
struct udevice *pmic = dev_get_parent(dev);
int err;
if (gpio > 7)
return -EINVAL;
if (value == 0)
value = AS3722_GPIO_CONTROL_MODE_OUTPUT_VDDL;
else
value = AS3722_GPIO_CONTROL_MODE_OUTPUT_VDDH;
err = pmic_reg_write(pmic, AS3722_GPIO_CONTROL(gpio), value);
if (err) {
pr_err("failed to configure GPIO#%u as output: %d\n", gpio,
err);
return err;
}
err = as3722_gpio_set_value(pmic, gpio, value);
if (err < 0) {
pr_err("failed to set GPIO#%u high: %d\n", gpio, err);
return err;
}
return 0;
}
static int as3722_gpio_probe(struct udevice *dev)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
uc_priv->gpio_count = NUM_GPIOS;
uc_priv->bank_name = "as3722_";
return 0;
}
static const struct dm_gpio_ops gpio_as3722_ops = {
.direction_output = as3722_gpio_direction_output,
.set_value = as3722_gpio_set_value,
};
U_BOOT_DRIVER(gpio_as3722) = {
.name = "gpio_as3722",
.id = UCLASS_GPIO,
.ops = &gpio_as3722_ops,
.probe = as3722_gpio_probe,
};