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linux-next/drivers/regulator/stm32-pwr.c
Rob Herring 045a44d4c9
regulator: Explicitly include correct DT includes
The DT of_device.h and of_platform.h date back to the separate
of_platform_bus_type before it as merged into the regular platform bus.
As part of that merge prepping Arm DT support 13 years ago, they
"temporarily" include each other. They also include platform_device.h
and of.h. As a result, there's a pretty much random mix of those include
files used throughout the tree. In order to detangle these headers and
replace the implicit includes with struct declarations, users need to
explicitly include the correct includes.

Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230714174930.4063320-1-robh@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
2023-07-14 20:52:54 +01:00

185 lines
4.4 KiB
C

// SPDX-License-Identifier: GPL-2.0
// Copyright (C) STMicroelectronics 2019
// Authors: Gabriel Fernandez <gabriel.fernandez@st.com>
// Pascal Paillet <p.paillet@st.com>.
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
/*
* Registers description
*/
#define REG_PWR_CR3 0x0C
#define USB_3_3_EN BIT(24)
#define USB_3_3_RDY BIT(26)
#define REG_1_8_EN BIT(28)
#define REG_1_8_RDY BIT(29)
#define REG_1_1_EN BIT(30)
#define REG_1_1_RDY BIT(31)
/* list of supported regulators */
enum {
PWR_REG11,
PWR_REG18,
PWR_USB33,
STM32PWR_REG_NUM_REGS
};
static u32 ready_mask_table[STM32PWR_REG_NUM_REGS] = {
[PWR_REG11] = REG_1_1_RDY,
[PWR_REG18] = REG_1_8_RDY,
[PWR_USB33] = USB_3_3_RDY,
};
struct stm32_pwr_reg {
void __iomem *base;
u32 ready_mask;
};
static int stm32_pwr_reg_is_ready(struct regulator_dev *rdev)
{
struct stm32_pwr_reg *priv = rdev_get_drvdata(rdev);
u32 val;
val = readl_relaxed(priv->base + REG_PWR_CR3);
return (val & priv->ready_mask);
}
static int stm32_pwr_reg_is_enabled(struct regulator_dev *rdev)
{
struct stm32_pwr_reg *priv = rdev_get_drvdata(rdev);
u32 val;
val = readl_relaxed(priv->base + REG_PWR_CR3);
return (val & rdev->desc->enable_mask);
}
static int stm32_pwr_reg_enable(struct regulator_dev *rdev)
{
struct stm32_pwr_reg *priv = rdev_get_drvdata(rdev);
int ret;
u32 val;
val = readl_relaxed(priv->base + REG_PWR_CR3);
val |= rdev->desc->enable_mask;
writel_relaxed(val, priv->base + REG_PWR_CR3);
/* use an arbitrary timeout of 20ms */
ret = readx_poll_timeout(stm32_pwr_reg_is_ready, rdev, val, val,
100, 20 * 1000);
if (ret)
dev_err(&rdev->dev, "regulator enable timed out!\n");
return ret;
}
static int stm32_pwr_reg_disable(struct regulator_dev *rdev)
{
struct stm32_pwr_reg *priv = rdev_get_drvdata(rdev);
int ret;
u32 val;
val = readl_relaxed(priv->base + REG_PWR_CR3);
val &= ~rdev->desc->enable_mask;
writel_relaxed(val, priv->base + REG_PWR_CR3);
/* use an arbitrary timeout of 20ms */
ret = readx_poll_timeout(stm32_pwr_reg_is_enabled, rdev, val, !val,
100, 20 * 1000);
if (ret)
dev_err(&rdev->dev, "regulator disable timed out!\n");
return ret;
}
static const struct regulator_ops stm32_pwr_reg_ops = {
.enable = stm32_pwr_reg_enable,
.disable = stm32_pwr_reg_disable,
.is_enabled = stm32_pwr_reg_is_enabled,
};
#define PWR_REG(_id, _name, _volt, _en, _supply) \
[_id] = { \
.id = _id, \
.name = _name, \
.of_match = of_match_ptr(_name), \
.n_voltages = 1, \
.type = REGULATOR_VOLTAGE, \
.fixed_uV = _volt, \
.ops = &stm32_pwr_reg_ops, \
.enable_mask = _en, \
.owner = THIS_MODULE, \
.supply_name = _supply, \
} \
static const struct regulator_desc stm32_pwr_desc[] = {
PWR_REG(PWR_REG11, "reg11", 1100000, REG_1_1_EN, "vdd"),
PWR_REG(PWR_REG18, "reg18", 1800000, REG_1_8_EN, "vdd"),
PWR_REG(PWR_USB33, "usb33", 3300000, USB_3_3_EN, "vdd_3v3_usbfs"),
};
static int stm32_pwr_regulator_probe(struct platform_device *pdev)
{
struct stm32_pwr_reg *priv;
void __iomem *base;
struct regulator_dev *rdev;
struct regulator_config config = { };
int i, ret = 0;
base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base)) {
dev_err(&pdev->dev, "Unable to map IO memory\n");
return PTR_ERR(base);
}
config.dev = &pdev->dev;
for (i = 0; i < STM32PWR_REG_NUM_REGS; i++) {
priv = devm_kzalloc(&pdev->dev, sizeof(struct stm32_pwr_reg),
GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->base = base;
priv->ready_mask = ready_mask_table[i];
config.driver_data = priv;
rdev = devm_regulator_register(&pdev->dev,
&stm32_pwr_desc[i],
&config);
if (IS_ERR(rdev)) {
ret = PTR_ERR(rdev);
dev_err(&pdev->dev,
"Failed to register regulator: %d\n", ret);
break;
}
}
return ret;
}
static const struct of_device_id __maybe_unused stm32_pwr_of_match[] = {
{ .compatible = "st,stm32mp1,pwr-reg", },
{},
};
MODULE_DEVICE_TABLE(of, stm32_pwr_of_match);
static struct platform_driver stm32_pwr_driver = {
.probe = stm32_pwr_regulator_probe,
.driver = {
.name = "stm32-pwr-regulator",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = of_match_ptr(stm32_pwr_of_match),
},
};
module_platform_driver(stm32_pwr_driver);
MODULE_DESCRIPTION("STM32MP1 PWR voltage regulator driver");
MODULE_AUTHOR("Pascal Paillet <p.paillet@st.com>");