as3722.c
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/*
* Copyright (C) 2014 NVIDIA Corporation
*
* SPDX-License-Identifier: GPL-2.0+
*/
#define pr_fmt(fmt) "as3722: " fmt
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <fdtdec.h>
#include <i2c.h>
#include <dm/lists.h>
#include <power/as3722.h>
#include <power/pmic.h>
#define AS3722_NUM_OF_REGS 0x92
static int as3722_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
{
int ret;
ret = dm_i2c_read(dev, reg, buff, len);
if (ret < 0)
return ret;
return 0;
}
static int as3722_write(struct udevice *dev, uint reg, const uint8_t *buff,
int len)
{
int ret;
ret = dm_i2c_write(dev, reg, buff, len);
if (ret < 0)
return ret;
return 0;
}
static int as3722_read_id(struct udevice *dev, uint *idp, uint *revisionp)
{
int ret;
ret = pmic_reg_read(dev, AS3722_ASIC_ID1);
if (ret < 0) {
pr_err("failed to read ID1 register: %d", ret);
return ret;
}
*idp = ret;
ret = pmic_reg_read(dev, AS3722_ASIC_ID2);
if (ret < 0) {
pr_err("failed to read ID2 register: %d", ret);
return ret;
}
*revisionp = ret;
return 0;
}
/* TODO(treding@nvidia.com): Add proper regulator support to avoid this */
int as3722_sd_set_voltage(struct udevice *dev, unsigned int sd, u8 value)
{
int ret;
if (sd > 6)
return -EINVAL;
ret = pmic_reg_write(dev, AS3722_SD_VOLTAGE(sd), value);
if (ret < 0) {
pr_err("failed to write SD%u voltage register: %d", sd, ret);
return ret;
}
return 0;
}
int as3722_ldo_set_voltage(struct udevice *dev, unsigned int ldo, u8 value)
{
int ret;
if (ldo > 11)
return -EINVAL;
ret = pmic_reg_write(dev, AS3722_LDO_VOLTAGE(ldo), value);
if (ret < 0) {
pr_err("failed to write LDO%u voltage register: %d", ldo,
ret);
return ret;
}
return 0;
}
static int as3722_probe(struct udevice *dev)
{
uint id, revision;
int ret;
ret = as3722_read_id(dev, &id, &revision);
if (ret < 0) {
pr_err("failed to read ID: %d", ret);
return ret;
}
if (id != AS3722_DEVICE_ID) {
pr_err("unknown device");
return -ENOENT;
}
debug("AS3722 revision %#x found on I2C bus %s\n", revision, dev->name);
return 0;
}
#if CONFIG_IS_ENABLED(PMIC_CHILDREN)
static const struct pmic_child_info pmic_children_info[] = {
{ .prefix = "sd", .driver = "as3722_stepdown"},
{ .prefix = "ldo", .driver = "as3722_ldo"},
{ },
};
static int as3722_bind(struct udevice *dev)
{
struct udevice *gpio_dev;
ofnode regulators_node;
int children;
int ret;
regulators_node = dev_read_subnode(dev, "regulators");
if (!ofnode_valid(regulators_node)) {
debug("%s: %s regulators subnode not found\n", __func__,
dev->name);
return -ENXIO;
}
children = pmic_bind_children(dev, regulators_node, pmic_children_info);
if (!children)
debug("%s: %s - no child found\n", __func__, dev->name);
ret = device_bind_driver(dev, "gpio_as3722", "gpio_as3722", &gpio_dev);
if (ret) {
debug("%s: Cannot bind GPIOs (ret=%d)\n", __func__, ret);
return ret;
}
return 0;
}
#endif
static int as3722_reg_count(struct udevice *dev)
{
return AS3722_NUM_OF_REGS;
}
static struct dm_pmic_ops as3722_ops = {
.reg_count = as3722_reg_count,
.read = as3722_read,
.write = as3722_write,
};
static const struct udevice_id as3722_ids[] = {
{ .compatible = "ams,as3722" },
{ }
};
U_BOOT_DRIVER(pmic_as3722) = {
.name = "as3722_pmic",
.id = UCLASS_PMIC,
.of_match = as3722_ids,
#if CONFIG_IS_ENABLED(PMIC_CHILDREN)
.bind = as3722_bind,
#endif
.probe = as3722_probe,
.ops = &as3722_ops,
};