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pmic: pca9450: Add optional SD_VSEL GPIO for LDO5

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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>
This commit is contained in:
Frieder Schrempf 2022-06-27 13:00:58 +02:00 committed by Stefano Babic
parent 6b5ecb8293
commit 2add051175
1 changed files with 27 additions and 0 deletions
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27
drivers/power/pmic/pca9450.c
View file

@ -7,9 +7,12 @@
#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>
@ -26,6 +29,10 @@ static const struct pmic_child_info pmic_children_info[] = {
{ },
};
struct pca9450_priv {
struct gpio_desc *sd_vsel_gpio;
};
static int pca9450_reg_count(struct udevice *dev)
{
return PCA9450_REG_NUM;
@ -76,6 +83,24 @@ static int pca9450_bind(struct udevice *dev)
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,
@ -94,5 +119,7 @@ U_BOOT_DRIVER(pmic_pca9450) = {
.id = UCLASS_PMIC,
.of_match = pca9450_ids,
.bind = pca9450_bind,
.probe = pca9450_probe,
.ops = &pca9450_ops,
.priv_auto = sizeof(struct pca9450_priv),
};