mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-21 18:53:06 +00:00
bba76a17bd
This commit adds support for the MAX7320 (and clones) gpio expander. Signed-off-by: Hannes Schmelzer <hannes.schmelzer@br-automation.com>
113 lines
2.6 KiB
C
113 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* max7320 I2C GPIO EXPANDER DRIVER
|
|
*
|
|
* Copyright (C) 2021 Hannes Schmelzer <oe5hpm@oevsv.at>
|
|
* B&R Industrial Automation GmbH - http://www.br-automation.com
|
|
*
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <i2c.h>
|
|
#include <asm-generic/gpio.h>
|
|
#include <linux/bitops.h>
|
|
|
|
struct max7320_chip {
|
|
u32 outreg;
|
|
};
|
|
|
|
static int max7320_direction_output(struct udevice *dev,
|
|
unsigned int offset, int value)
|
|
{
|
|
struct max7320_chip *plat = dev_get_plat(dev);
|
|
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
|
|
struct dm_i2c_chip *chip = dev_get_parent_plat(dev);
|
|
|
|
int ret;
|
|
|
|
if (value)
|
|
plat->outreg |= BIT(offset);
|
|
else
|
|
plat->outreg &= ~BIT(offset);
|
|
|
|
ret = dm_i2c_write(dev,
|
|
plat->outreg & 0xff,
|
|
(uint8_t *)&plat->outreg + 1,
|
|
uc_priv->gpio_count > 8 ? 1 : 0);
|
|
if (ret)
|
|
printf("%s i2c write failed to addr %x\n", __func__,
|
|
chip->chip_addr);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int max7320_get_value(struct udevice *dev, unsigned int offset)
|
|
{
|
|
struct max7320_chip *plat = dev_get_plat(dev);
|
|
|
|
return (plat->outreg >> offset) & 0x1;
|
|
}
|
|
|
|
static int max7320_set_value(struct udevice *dev, unsigned int offset,
|
|
int value)
|
|
{
|
|
return max7320_direction_output(dev, offset, value);
|
|
}
|
|
|
|
static int max7320_get_function(struct udevice *dev, unsigned int offset)
|
|
{
|
|
return GPIOF_OUTPUT;
|
|
}
|
|
|
|
static int max7320_ofdata_plat(struct udevice *dev)
|
|
{
|
|
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
|
|
|
|
uc_priv->gpio_count = dev_read_u32_default(dev, "ngpios", 8);
|
|
if (uc_priv->gpio_count > 16) {
|
|
printf("%s: max7320 doesn't support more than 16 gpios!",
|
|
__func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
uc_priv->bank_name = fdt_getprop(gd->fdt_blob, dev_of_offset(dev),
|
|
"gpio-bank-name", NULL);
|
|
if (!uc_priv->bank_name)
|
|
uc_priv->bank_name = fdt_get_name(gd->fdt_blob,
|
|
dev_of_offset(dev), NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int max7320_gpio_probe(struct udevice *dev)
|
|
{
|
|
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
|
|
|
|
debug("%s GPIO controller with %d gpios probed\n",
|
|
uc_priv->bank_name, uc_priv->gpio_count);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dm_gpio_ops max7320_gpio_ops = {
|
|
.direction_output = max7320_direction_output,
|
|
.set_value = max7320_set_value,
|
|
.get_value = max7320_get_value,
|
|
.get_function = max7320_get_function,
|
|
};
|
|
|
|
static const struct udevice_id max7320_gpio_ids[] = {
|
|
{ .compatible = "maxim,max7320" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(gpio_max7320) = {
|
|
.name = "gpio_max7320",
|
|
.id = UCLASS_GPIO,
|
|
.ops = &max7320_gpio_ops,
|
|
.of_match = max7320_gpio_ids,
|
|
.of_to_plat = max7320_ofdata_plat,
|
|
.probe = max7320_gpio_probe,
|
|
.plat_auto = sizeof(struct max7320_chip),
|
|
};
|