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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>
126 lines
2.9 KiB
C
126 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2019 NXP
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*/
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#include <common.h>
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#include <fdtdec.h>
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#include <errno.h>
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#include <dm.h>
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#include <dm/device_compat.h>
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#include <i2c.h>
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#include <linux/err.h>
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#include <log.h>
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#include <asm/global_data.h>
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#include <asm-generic/gpio.h>
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#include <power/pmic.h>
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#include <power/regulator.h>
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#include <power/pca9450.h>
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DECLARE_GLOBAL_DATA_PTR;
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static const struct pmic_child_info pmic_children_info[] = {
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/* buck */
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{ .prefix = "b", .driver = PCA9450_REGULATOR_DRIVER},
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{ .prefix = "B", .driver = PCA9450_REGULATOR_DRIVER},
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/* ldo */
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{ .prefix = "l", .driver = PCA9450_REGULATOR_DRIVER},
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{ .prefix = "L", .driver = PCA9450_REGULATOR_DRIVER},
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{ },
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};
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struct pca9450_priv {
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struct gpio_desc *sd_vsel_gpio;
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};
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static int pca9450_reg_count(struct udevice *dev)
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{
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return PCA9450_REG_NUM;
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}
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static int pca9450_write(struct udevice *dev, uint reg, const uint8_t *buff,
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int len)
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{
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if (dm_i2c_write(dev, reg, buff, len)) {
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pr_err("write error to device: %p register: %#x!", dev, reg);
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return -EIO;
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}
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return 0;
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}
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static int pca9450_read(struct udevice *dev, uint reg, uint8_t *buff,
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int len)
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{
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if (dm_i2c_read(dev, reg, buff, len)) {
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pr_err("read error from device: %p register: %#x!", dev, reg);
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return -EIO;
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}
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return 0;
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}
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static int pca9450_bind(struct udevice *dev)
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{
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int children;
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ofnode regulators_node;
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regulators_node = dev_read_subnode(dev, "regulators");
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if (!ofnode_valid(regulators_node)) {
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debug("%s: %s regulators subnode not found!", __func__,
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dev->name);
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return -ENXIO;
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}
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debug("%s: '%s' - found regulators subnode\n", __func__, dev->name);
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children = pmic_bind_children(dev, regulators_node,
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pmic_children_info);
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if (!children)
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debug("%s: %s - no child found\n", __func__, dev->name);
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/* Always return success for this device */
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return 0;
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}
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static int pca9450_probe(struct udevice *dev)
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{
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struct pca9450_priv *priv = dev_get_priv(dev);
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int ret = 0;
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if (CONFIG_IS_ENABLED(DM_GPIO) && CONFIG_IS_ENABLED(DM_REGULATOR_PCA9450)) {
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priv->sd_vsel_gpio = devm_gpiod_get_optional(dev, "sd-vsel",
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GPIOD_IS_OUT |
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GPIOD_IS_OUT_ACTIVE);
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if (IS_ERR(priv->sd_vsel_gpio)) {
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ret = PTR_ERR(priv->sd_vsel_gpio);
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dev_err(dev, "Failed to request SD_VSEL GPIO: %d\n", ret);
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}
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}
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return ret;
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}
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static struct dm_pmic_ops pca9450_ops = {
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.reg_count = pca9450_reg_count,
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.read = pca9450_read,
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.write = pca9450_write,
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};
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static const struct udevice_id pca9450_ids[] = {
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{ .compatible = "nxp,pca9450a", .data = NXP_CHIP_TYPE_PCA9450A, },
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{ .compatible = "nxp,pca9450b", .data = NXP_CHIP_TYPE_PCA9450BC, },
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{ .compatible = "nxp,pca9450c", .data = NXP_CHIP_TYPE_PCA9450BC, },
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{ }
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};
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U_BOOT_DRIVER(pmic_pca9450) = {
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.name = "pca9450 pmic",
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.id = UCLASS_PMIC,
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.of_match = pca9450_ids,
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.bind = pca9450_bind,
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.probe = pca9450_probe,
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.ops = &pca9450_ops,
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.priv_auto = sizeof(struct pca9450_priv),
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};
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