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pwm: mc33xs2410: add hwmon support 

Support for hwmon is provided by a separate driver residing in hwmon
subsystem which is implemented as auxiliary device. Add handling of this
device.

Signed-off-by: Dimitri Fedrau <dimitri.fedrau@liebherr.com>
Link: https://lore.kernel.org/r/20250723-mc33xs2410-hwmon-v5-1-f62aab71cd59@liebherr.com
Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
This commit is contained in:
Dimitri Fedrau 2025-07-23 19:34:56 +02:00 committed by Uwe Kleine-König
parent a582469541
commit 28517c8b62
3 changed files with 35 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/pwm/Kconfig
View File

@ -436,6 +436,7 @@ config PWM_MC33XS2410
tristate "MC33XS2410 PWM support"
depends on OF
depends on SPI
select AUXILIARY_BUS
help
NXP MC33XS2410 high-side switch driver. The MC33XS2410 is a four
channel high-side switch. The device is operational from 3.0 V

20
drivers/pwm/pwm-mc33xs2410.c
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@ -17,11 +17,14 @@
* behavior of the output pin that is neither the old nor the new state,
* rather something in between.
*/
#define DEFAULT_SYMBOL_NAMESPACE "PWM_MC33XS2410"
#include <linux/auxiliary_bus.h>
#include <linux/bitfield.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/math64.h>
#include <linux/mc33xs2410.h>
#include <linux/minmax.h>
#include <linux/module.h>
#include <linux/of.h>
@ -120,12 +123,19 @@ static int mc33xs2410_read_reg(struct spi_device *spi, u8 reg, u16 *val, u8 flag
return mc33xs2410_read_regs(spi, &reg, flag, val, 1);
}
static int mc33xs2410_read_reg_ctrl(struct spi_device *spi, u8 reg, u16 *val)
int mc33xs2410_read_reg_ctrl(struct spi_device *spi, u8 reg, u16 *val)
{
return mc33xs2410_read_reg(spi, reg, val, MC33XS2410_FRAME_IN_DATA_RD);
}
EXPORT_SYMBOL_GPL(mc33xs2410_read_reg_ctrl);
static int mc33xs2410_modify_reg(struct spi_device *spi, u8 reg, u8 mask, u8 val)
int mc33xs2410_read_reg_diag(struct spi_device *spi, u8 reg, u16 *val)
{
return mc33xs2410_read_reg(spi, reg, val, 0);
}
EXPORT_SYMBOL_GPL(mc33xs2410_read_reg_diag);
int mc33xs2410_modify_reg(struct spi_device *spi, u8 reg, u8 mask, u8 val)
{
u16 tmp;
int ret;
@ -139,6 +149,7 @@ static int mc33xs2410_modify_reg(struct spi_device *spi, u8 reg, u8 mask, u8 val
return mc33xs2410_write_reg(spi, reg, tmp);
}
EXPORT_SYMBOL_GPL(mc33xs2410_modify_reg);
static u8 mc33xs2410_pwm_get_freq(u64 period)
{
@ -314,6 +325,7 @@ static int mc33xs2410_reset(struct device *dev)
static int mc33xs2410_probe(struct spi_device *spi)
{
struct device *dev = &spi->dev;
struct auxiliary_device *adev;
struct pwm_chip *chip;
int ret;
@ -361,6 +373,10 @@ static int mc33xs2410_probe(struct spi_device *spi)
if (ret < 0)
return dev_err_probe(dev, ret, "Failed to add pwm chip\n");
adev = devm_auxiliary_device_create(dev, "hwmon", NULL);
if (!adev)
return dev_err_probe(dev, -ENODEV, "Failed to register hwmon device\n");
return 0;
}

16
include/linux/mc33xs2410.h Normal file
View File

@ -0,0 +1,16 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2024 Liebherr-Electronics and Drives GmbH
*/
#ifndef _MC33XS2410_H
#define _MC33XS2410_H
#include <linux/spi/spi.h>
MODULE_IMPORT_NS("PWM_MC33XS2410");
int mc33xs2410_read_reg_ctrl(struct spi_device *spi, u8 reg, u16 *val);
int mc33xs2410_read_reg_diag(struct spi_device *spi, u8 reg, u16 *val);
int mc33xs2410_modify_reg(struct spi_device *spi, u8 reg, u8 mask, u8 val);
#endif /* _MC33XS2410_H */