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910c7a881f
The default configuration of the PMIC behavior makes the PMIC
power cycle most regulators on WDOG_B assertion. This power
cycling causes the memory contents of OCRAM to be lost.
Some systems neeeds some memory that survives reset and
reboot, therefore this patch is created.
The implementation is taken almost verbatim from Linux commit
2364a64d0673f ("regulator: pca9450: Make warm reset on WDOG_B assertion")
Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
134 lines
3.2 KiB
C
134 lines
3.2 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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unsigned int reset_ctrl;
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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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if (ret)
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return ret;
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}
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}
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if (ofnode_read_bool(dev_ofnode(dev), "nxp,wdog_b-warm-reset"))
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reset_ctrl = PCA9450_PMIC_RESET_WDOG_B_CFG_WARM;
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else
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reset_ctrl = PCA9450_PMIC_RESET_WDOG_B_CFG_COLD_LDO12;
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return pmic_clrsetbits(dev, PCA9450_RESET_CTRL,
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PCA9450_PMIC_RESET_WDOG_B_CFG_MASK, reset_ctrl);
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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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