mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-23 19:43:33 +00:00
2add051175
LDO5 has two separate control registers. LDO5CTRL_L is used if the
input signal SD_VSEL is low and LDO5CTRL_H if it is high.
The current driver implementation only uses LDO5CTRL_H. To make this
work on boards that have SD_VSEL connected to a GPIO, we add support
for specifying an optional GPIO and setting it to high at probe time.
In the future we might also want to add support for boards that have
SD_VSEL set to a fixed low level. In this case we need to change the
driver to be able to use the LDO5CTRL_L register.
This is a port of the same change in the Linux kernel:
8c67a11bae88 ("regulator: pca9450: Add SD_VSEL GPIO for LDO5")
Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Reviewed-by: Fabio Estevam <festevam@denx.de>
Tested-by: Fabio Estevam <festevam@denx.de>
125 lines
2.9 KiB
C
125 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright 2019 NXP
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <fdtdec.h>
|
|
#include <errno.h>
|
|
#include <dm.h>
|
|
#include <dm/device_compat.h>
|
|
#include <i2c.h>
|
|
#include <linux/err.h>
|
|
#include <log.h>
|
|
#include <asm/global_data.h>
|
|
#include <asm-generic/gpio.h>
|
|
#include <power/pmic.h>
|
|
#include <power/regulator.h>
|
|
#include <power/pca9450.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
static const struct pmic_child_info pmic_children_info[] = {
|
|
/* buck */
|
|
{ .prefix = "b", .driver = PCA9450_REGULATOR_DRIVER},
|
|
{ .prefix = "B", .driver = PCA9450_REGULATOR_DRIVER},
|
|
/* ldo */
|
|
{ .prefix = "l", .driver = PCA9450_REGULATOR_DRIVER},
|
|
{ .prefix = "L", .driver = PCA9450_REGULATOR_DRIVER},
|
|
{ },
|
|
};
|
|
|
|
struct pca9450_priv {
|
|
struct gpio_desc *sd_vsel_gpio;
|
|
};
|
|
|
|
static int pca9450_reg_count(struct udevice *dev)
|
|
{
|
|
return PCA9450_REG_NUM;
|
|
}
|
|
|
|
static int pca9450_write(struct udevice *dev, uint reg, const uint8_t *buff,
|
|
int len)
|
|
{
|
|
if (dm_i2c_write(dev, reg, buff, len)) {
|
|
pr_err("write error to device: %p register: %#x!", dev, reg);
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pca9450_read(struct udevice *dev, uint reg, uint8_t *buff,
|
|
int len)
|
|
{
|
|
if (dm_i2c_read(dev, reg, buff, len)) {
|
|
pr_err("read error from device: %p register: %#x!", dev, reg);
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pca9450_bind(struct udevice *dev)
|
|
{
|
|
int children;
|
|
ofnode regulators_node;
|
|
|
|
regulators_node = dev_read_subnode(dev, "regulators");
|
|
if (!ofnode_valid(regulators_node)) {
|
|
debug("%s: %s regulators subnode not found!", __func__,
|
|
dev->name);
|
|
return -ENXIO;
|
|
}
|
|
|
|
debug("%s: '%s' - found regulators subnode\n", __func__, dev->name);
|
|
|
|
children = pmic_bind_children(dev, regulators_node,
|
|
pmic_children_info);
|
|
if (!children)
|
|
debug("%s: %s - no child found\n", __func__, dev->name);
|
|
|
|
/* Always return success for this device */
|
|
return 0;
|
|
}
|
|
|
|
static int pca9450_probe(struct udevice *dev)
|
|
{
|
|
struct pca9450_priv *priv = dev_get_priv(dev);
|
|
int ret = 0;
|
|
|
|
if (CONFIG_IS_ENABLED(DM_GPIO) && CONFIG_IS_ENABLED(DM_REGULATOR_PCA9450)) {
|
|
priv->sd_vsel_gpio = devm_gpiod_get_optional(dev, "sd-vsel",
|
|
GPIOD_IS_OUT |
|
|
GPIOD_IS_OUT_ACTIVE);
|
|
if (IS_ERR(priv->sd_vsel_gpio)) {
|
|
ret = PTR_ERR(priv->sd_vsel_gpio);
|
|
dev_err(dev, "Failed to request SD_VSEL GPIO: %d\n", ret);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct dm_pmic_ops pca9450_ops = {
|
|
.reg_count = pca9450_reg_count,
|
|
.read = pca9450_read,
|
|
.write = pca9450_write,
|
|
};
|
|
|
|
static const struct udevice_id pca9450_ids[] = {
|
|
{ .compatible = "nxp,pca9450a", .data = NXP_CHIP_TYPE_PCA9450A, },
|
|
{ .compatible = "nxp,pca9450b", .data = NXP_CHIP_TYPE_PCA9450BC, },
|
|
{ .compatible = "nxp,pca9450c", .data = NXP_CHIP_TYPE_PCA9450BC, },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(pmic_pca9450) = {
|
|
.name = "pca9450 pmic",
|
|
.id = UCLASS_PMIC,
|
|
.of_match = pca9450_ids,
|
|
.bind = pca9450_bind,
|
|
.probe = pca9450_probe,
|
|
.ops = &pca9450_ops,
|
|
.priv_auto = sizeof(struct pca9450_priv),
|
|
};
|