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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2024 Texas Instruments Incorporated - http://www.ti.com/
* Keerthy <j-keerthy@ti.com>
*/
#include <dm.h>
#include <i2c.h>
#include <dm/device_compat.h>
#include <power/regulator.h>
#define TPS6287X_REG_VSET 0x0
#define TPS6287X_REG_CONTROL1 0x1
#define TPS6287X_REG_CONTROL2 0x2
#define TPS6287X_REG_CONTROL3 0x3
#define TPS6287X_REG_STATUS 0x4
#define TPS6287X_REG_VSET_VSET_MASK 0xff
#define TPS6287X_REG_CONTROL2_VRANGE_MASK 0xc
struct tps6287x_regulator_config {
u32 vmin;
u32 vmax;
};
struct tps6287x_regulator_pdata {
u8 vsel_offset;
struct udevice *i2c;
struct tps6287x_regulator_config *config;
};
static struct tps6287x_regulator_config tps6287x_data = {
.vmin = 400000,
.vmax = 3350000,
};
static int tps6287x_regulator_set_value(struct udevice *dev, int uV)
{
struct tps6287x_regulator_pdata *pdata = dev_get_plat(dev);
u8 regval, vset;
int ret;
if (uV < pdata->config->vmin || uV > pdata->config->vmax)
return -EINVAL;
/*
* Based on the value of VRANGE bit field of CONTROL2 reg the range
* varies.
*/
ret = dm_i2c_read(pdata->i2c, TPS6287X_REG_CONTROL2, ®val, 1);
if (ret) {
dev_err(dev, "CTRL2 reg read failed: %d\n", ret);
return ret;
}
regval &= TPS6287X_REG_CONTROL2_VRANGE_MASK;
regval >>= ffs(TPS6287X_REG_CONTROL2_VRANGE_MASK) - 1;
/*
* VRANGE = 0. Increment step 1250 uV starting with 0 --> 400000 uV
* VRANGE = 1. Increment step 2500 uV starting with 0 --> 400000 uV
* VRANGE = 2. Increment step 5000 uV starting with 0 --> 400000 uV
* VRANGE = 3. Increment step 10000 uV starting with 0 --> 800000 uV
*/
switch (regval) {
case 0:
vset = (uV - 400000) / 1250;
break;
case 1:
vset = (uV - 400000) / 2500;
break;
case 2:
vset = (uV - 400000) / 5000;
break;
case 3:
vset = (uV - 800000) / 10000;
break;
default:
pr_err("%s: invalid regval %d\n", dev->name, regval);
return -EINVAL;
}
return dm_i2c_write(pdata->i2c, TPS6287X_REG_VSET, &vset, 1);
}
static int tps6287x_regulator_get_value(struct udevice *dev)
{
u8 regval, vset;
int uV;
int ret;
struct tps6287x_regulator_pdata *pdata = dev_get_plat(dev);
/*
* Based on the value of VRANGE bit field of CONTROL2 reg the range
* varies.
*/
ret = dm_i2c_read(pdata->i2c, TPS6287X_REG_CONTROL2, ®val, 1);
if (ret) {
dev_err(dev, "i2c read failed: %d\n", ret);
return ret;
}
regval &= TPS6287X_REG_CONTROL2_VRANGE_MASK;
regval >>= ffs(TPS6287X_REG_CONTROL2_VRANGE_MASK) - 1;
ret = dm_i2c_read(pdata->i2c, TPS6287X_REG_VSET, &vset, 1);
if (ret) {
dev_err(dev, "i2c VSET read failed: %d\n", ret);
return ret;
}
/*
* VRANGE = 0. Increment step 1250 uV starting with 0 --> 400000 uV
* VRANGE = 1. Increment step 2500 uV starting with 0 --> 400000 uV
* VRANGE = 2. Increment step 5000 uV starting with 0 --> 400000 uV
* VRANGE = 3. Increment step 10000 uV starting with 0 --> 800000 uV
*/
switch (regval) {
case 0:
uV = 400000 + vset * 1250;
break;
case 1:
uV = 400000 + vset * 2500;
break;
case 2:
uV = 400000 + vset * 5000;
break;
case 3:
uV = 800000 + vset * 10000;
break;
default:
pr_err("%s: invalid regval %d\n", dev->name, regval);
return -EINVAL;
}
return uV;
}
static int tps6287x_regulator_probe(struct udevice *dev)
{
struct tps6287x_regulator_pdata *pdata = dev_get_plat(dev);
int ret, slave_id;
pdata->config = (void *)dev_get_driver_data(dev);
slave_id = devfdt_get_addr_index(dev, 0);
ret = i2c_get_chip(dev->parent, slave_id, 1, &pdata->i2c);
if (ret) {
dev_err(dev, "i2c dev get failed.\n");
return ret;
}
return 0;
}
static const struct dm_regulator_ops tps6287x_regulator_ops = {
.get_value = tps6287x_regulator_get_value,
.set_value = tps6287x_regulator_set_value,
};
static const struct udevice_id tps6287x_regulator_ids[] = {
{ .compatible = "ti,tps62873", .data = (ulong)&tps6287x_data },
{ },
};
U_BOOT_DRIVER(tps6287x_regulator) = {
.name = "tps6287x_regulator",
.id = UCLASS_REGULATOR,
.ops = &tps6287x_regulator_ops,
.of_match = tps6287x_regulator_ids,
.plat_auto = sizeof(struct tps6287x_regulator_pdata),
.probe = tps6287x_regulator_probe,
};
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