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linux-stable/drivers/regulator/mp886x.c
Jean Delvare c4b02c92d9
regulator: Drop obsolete dependencies on COMPILE_TEST 
Since commit 0166dc11be ("of: make CONFIG_OF user selectable"), it
is possible to test-build any driver which depends on OF on any
architecture by explicitly selecting OF. Therefore depending on
COMPILE_TEST as an alternative is no longer needed.

It is actually better to always build such drivers with OF enabled,
so that the test builds are closer to how each driver will actually be
built on its intended target. Building them without OF may not test
much as the compiler will optimize out potentially large parts of the
code. In the worst case, this could even pop false positive warnings.
Dropping COMPILE_TEST here improves the quality of our testing and
avoids wasting time on non-existent issues.

As a minor optimization, this also lets us drop several occurrences of
of_match_ptr(), __maybe_unused and some ifdef guarding, as we now know
what all of this will resolve to, we might as well save cpp some work.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Icenowy Zheng <icenowy@aosc.io>
Link: https://lore.kernel.org/r/20221124144708.64371b98@endymion.delvare
Signed-off-by: Mark Brown <broonie@kernel.org>
2022-11-24 16:30:19 +00:00

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// SPDX-License-Identifier: GPL-2.0
//
// MP8867/MP8869 regulator driver
//
// Copyright (C) 2020 Synaptics Incorporated
//
// Author: Jisheng Zhang <jszhang@kernel.org>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#define MP886X_VSEL 0x00
#define MP886X_V_BOOT (1 << 7)
#define MP886X_SYSCNTLREG1 0x01
#define MP886X_MODE (1 << 0)
#define MP886X_SLEW_SHIFT 3
#define MP886X_SLEW_MASK (0x7 << MP886X_SLEW_SHIFT)
#define MP886X_GO (1 << 6)
#define MP886X_EN (1 << 7)
#define MP8869_SYSCNTLREG2 0x02
struct mp886x_cfg_info {
const struct regulator_ops *rops;
const unsigned int slew_rates[8];
const int switch_freq[4];
const u8 fs_reg;
const u8 fs_shift;
};
struct mp886x_device_info {
struct device *dev;
struct regulator_desc desc;
struct regulator_init_data *regulator;
struct gpio_desc *en_gpio;
const struct mp886x_cfg_info *ci;
u32 r[2];
unsigned int sel;
};
static void mp886x_set_switch_freq(struct mp886x_device_info *di,
struct regmap *regmap,
u32 freq)
{
const struct mp886x_cfg_info *ci = di->ci;
int i;
for (i = 0; i < ARRAY_SIZE(ci->switch_freq); i++) {
if (freq == ci->switch_freq[i]) {
regmap_update_bits(regmap, ci->fs_reg,
0x3 << ci->fs_shift, i << ci->fs_shift);
return;
}
}
dev_err(di->dev, "invalid frequency %d\n", freq);
}
static int mp886x_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
switch (mode) {
case REGULATOR_MODE_FAST:
regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
MP886X_MODE, MP886X_MODE);
break;
case REGULATOR_MODE_NORMAL:
regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
MP886X_MODE, 0);
break;
default:
return -EINVAL;
}
return 0;
}
static unsigned int mp886x_get_mode(struct regulator_dev *rdev)
{
u32 val;
int ret;
ret = regmap_read(rdev->regmap, MP886X_SYSCNTLREG1, &val);
if (ret < 0)
return ret;
if (val & MP886X_MODE)
return REGULATOR_MODE_FAST;
else
return REGULATOR_MODE_NORMAL;
}
static int mp8869_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
{
int ret;
ret = regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
MP886X_GO, MP886X_GO);
if (ret < 0)
return ret;
sel <<= ffs(rdev->desc->vsel_mask) - 1;
return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
MP886X_V_BOOT | rdev->desc->vsel_mask, sel);
}
static inline unsigned int mp8869_scale(unsigned int uv, u32 r1, u32 r2)
{
u32 tmp = uv * r1 / r2;
return uv + tmp;
}
static int mp8869_get_voltage_sel(struct regulator_dev *rdev)
{
struct mp886x_device_info *di = rdev_get_drvdata(rdev);
int ret, uv;
unsigned int val;
bool fbloop;
ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
if (ret)
return ret;
fbloop = val & MP886X_V_BOOT;
if (fbloop) {
uv = rdev->desc->min_uV;
uv = mp8869_scale(uv, di->r[0], di->r[1]);
return regulator_map_voltage_linear(rdev, uv, uv);
}
val &= rdev->desc->vsel_mask;
val >>= ffs(rdev->desc->vsel_mask) - 1;
return val;
}
static const struct regulator_ops mp8869_regulator_ops = {
.set_voltage_sel = mp8869_set_voltage_sel,
.get_voltage_sel = mp8869_get_voltage_sel,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.map_voltage = regulator_map_voltage_linear,
.list_voltage = regulator_list_voltage_linear,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_mode = mp886x_set_mode,
.get_mode = mp886x_get_mode,
.set_ramp_delay = regulator_set_ramp_delay_regmap,
};
static const struct mp886x_cfg_info mp8869_ci = {
.rops = &mp8869_regulator_ops,
.slew_rates = {
40000,
30000,
20000,
10000,
5000,
2500,
1250,
625,
},
.switch_freq = {
500000,
750000,
1000000,
1250000,
},
.fs_reg = MP8869_SYSCNTLREG2,
.fs_shift = 4,
};
static int mp8867_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
{
struct mp886x_device_info *di = rdev_get_drvdata(rdev);
int ret, delta;
ret = mp8869_set_voltage_sel(rdev, sel);
if (ret < 0)
return ret;
delta = di->sel - sel;
if (abs(delta) <= 5)
ret = regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
MP886X_GO, 0);
di->sel = sel;
return ret;
}
static int mp8867_get_voltage_sel(struct regulator_dev *rdev)
{
struct mp886x_device_info *di = rdev_get_drvdata(rdev);
int ret, uv;
unsigned int val;
bool fbloop;
ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
if (ret)
return ret;
fbloop = val & MP886X_V_BOOT;
val &= rdev->desc->vsel_mask;
val >>= ffs(rdev->desc->vsel_mask) - 1;
if (fbloop) {
uv = regulator_list_voltage_linear(rdev, val);
uv = mp8869_scale(uv, di->r[0], di->r[1]);
return regulator_map_voltage_linear(rdev, uv, uv);
}
return val;
}
static const struct regulator_ops mp8867_regulator_ops = {
.set_voltage_sel = mp8867_set_voltage_sel,
.get_voltage_sel = mp8867_get_voltage_sel,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.map_voltage = regulator_map_voltage_linear,
.list_voltage = regulator_list_voltage_linear,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_mode = mp886x_set_mode,
.get_mode = mp886x_get_mode,
.set_ramp_delay = regulator_set_ramp_delay_regmap,
};
static const struct mp886x_cfg_info mp8867_ci = {
.rops = &mp8867_regulator_ops,
.slew_rates = {
64000,
32000,
16000,
8000,
4000,
2000,
1000,
500,
},
.switch_freq = {
500000,
750000,
1000000,
1500000,
},
.fs_reg = MP886X_SYSCNTLREG1,
.fs_shift = 1,
};
static int mp886x_regulator_register(struct mp886x_device_info *di,
struct regulator_config *config)
{
struct regulator_desc *rdesc = &di->desc;
struct regulator_dev *rdev;
rdesc->name = "mp886x-reg";
rdesc->supply_name = "vin";
rdesc->ops = di->ci->rops;
rdesc->type = REGULATOR_VOLTAGE;
rdesc->n_voltages = 128;
rdesc->enable_reg = MP886X_SYSCNTLREG1;
rdesc->enable_mask = MP886X_EN;
rdesc->min_uV = 600000;
rdesc->uV_step = 10000;
rdesc->vsel_reg = MP886X_VSEL;
rdesc->vsel_mask = 0x3f;
rdesc->ramp_reg = MP886X_SYSCNTLREG1;
rdesc->ramp_mask = MP886X_SLEW_MASK;
rdesc->ramp_delay_table = di->ci->slew_rates;
rdesc->n_ramp_values = ARRAY_SIZE(di->ci->slew_rates);
rdesc->owner = THIS_MODULE;
rdev = devm_regulator_register(di->dev, &di->desc, config);
if (IS_ERR(rdev))
return PTR_ERR(rdev);
di->sel = rdesc->ops->get_voltage_sel(rdev);
return 0;
}
static const struct regmap_config mp886x_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
};
static int mp886x_i2c_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct device_node *np = dev->of_node;
struct mp886x_device_info *di;
struct regulator_config config = { };
struct regmap *regmap;
u32 freq;
int ret;
di = devm_kzalloc(dev, sizeof(struct mp886x_device_info), GFP_KERNEL);
if (!di)
return -ENOMEM;
di->regulator = of_get_regulator_init_data(dev, np, &di->desc);
if (!di->regulator) {
dev_err(dev, "Platform data not found!\n");
return -EINVAL;
}
ret = of_property_read_u32_array(np, "mps,fb-voltage-divider",
di->r, 2);
if (ret)
return ret;
di->en_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_HIGH);
if (IS_ERR(di->en_gpio))
return PTR_ERR(di->en_gpio);
di->ci = of_device_get_match_data(dev);
di->dev = dev;
regmap = devm_regmap_init_i2c(client, &mp886x_regmap_config);
if (IS_ERR(regmap)) {
dev_err(dev, "Failed to allocate regmap!\n");
return PTR_ERR(regmap);
}
i2c_set_clientdata(client, di);
config.dev = di->dev;
config.init_data = di->regulator;
config.regmap = regmap;
config.driver_data = di;
config.of_node = np;
if (!of_property_read_u32(np, "mps,switch-frequency-hz", &freq))
mp886x_set_switch_freq(di, regmap, freq);
ret = mp886x_regulator_register(di, &config);
if (ret < 0)
dev_err(dev, "Failed to register regulator!\n");
return ret;
}
static const struct of_device_id mp886x_dt_ids[] = {
{
.compatible = "mps,mp8867",
.data = &mp8867_ci
},
{
.compatible = "mps,mp8869",
.data = &mp8869_ci
},
{ }
};
MODULE_DEVICE_TABLE(of, mp886x_dt_ids);
static const struct i2c_device_id mp886x_id[] = {
{ "mp886x", },
{ },
};
MODULE_DEVICE_TABLE(i2c, mp886x_id);
static struct i2c_driver mp886x_regulator_driver = {
.driver = {
.name = "mp886x-regulator",
.of_match_table = mp886x_dt_ids,
},
.probe_new = mp886x_i2c_probe,
.id_table = mp886x_id,
};
module_i2c_driver(mp886x_regulator_driver);
MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
MODULE_DESCRIPTION("MP886x regulator driver");
MODULE_LICENSE("GPL v2");
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