hwmon: constify pointers to hwmon_channel_info

HWmon core receives an array of pointers to hwmon_channel_info and it
does not modify it, thus it can be array of const pointers for safety.
This allows drivers to make them also const.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/hwmon/hwmon-kernel-api.rst

@@ -133,7 +133,7 @@ The hwmon_chip_info structure looks as follows::
 
 	struct hwmon_chip_info {
 		const struct hwmon_ops *ops;
-		const struct hwmon_channel_info **info;
+		const struct hwmon_channel_info * const *info;
 	};
 
 It contains the following fields:
@@ -229,7 +229,7 @@ register (HWMON_T_MAX) as well as a maximum temperature hysteresis register
 		.config = lm75_temp_config,
 	};
 
-	static const struct hwmon_channel_info *lm75_info[] = {
+	static const struct hwmon_channel_info * const lm75_info[] = {
 		&lm75_chip,
 		&lm75_temp,
 		NULL
@@ -238,7 +238,7 @@ register (HWMON_T_MAX) as well as a maximum temperature hysteresis register
 	The HWMON_CHANNEL_INFO() macro can and should be used when possible.
 	With this macro, the above example can be simplified to
 
-	static const struct hwmon_channel_info *lm75_info[] = {
+	static const struct hwmon_channel_info * const lm75_info[] = {
 		HWMON_CHANNEL_INFO(chip,
 				HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL),
 		HWMON_CHANNEL_INFO(temp,

drivers/accel/habanalabs/common/hwmon.c

@@ -914,7 +914,7 @@ void hl_hwmon_fini(struct hl_device *hdev)
 
 void hl_hwmon_release_resources(struct hl_device *hdev)
 {
-	const struct hwmon_channel_info **channel_info_arr;
+	const struct hwmon_channel_info * const *channel_info_arr;
 	int i = 0;
 
 	if (!hdev->hl_chip_info->info)

drivers/hwmon/hwmon.c

@@ -174,7 +174,7 @@ static int hwmon_thermal_set_trips(struct thermal_zone_device *tz, int low, int
 	struct hwmon_thermal_data *tdata = tz->devdata;
 	struct hwmon_device *hwdev = to_hwmon_device(tdata->dev);
 	const struct hwmon_chip_info *chip = hwdev->chip;
-	const struct hwmon_channel_info **info = chip->info;
+	const struct hwmon_channel_info * const *info = chip->info;
 	unsigned int i;
 	int err;
 
@@ -253,7 +253,7 @@ static int hwmon_thermal_register_sensors(struct device *dev)
 {
 	struct hwmon_device *hwdev = to_hwmon_device(dev);
 	const struct hwmon_chip_info *chip = hwdev->chip;
-	const struct hwmon_channel_info **info = chip->info;
+	const struct hwmon_channel_info * const *info = chip->info;
 	void *drvdata = dev_get_drvdata(dev);
 	int i;
 

include/linux/hwmon.h

@@ -430,7 +430,7 @@ struct hwmon_channel_info {
  */
 struct hwmon_chip_info {
 	const struct hwmon_ops *ops;
-	const struct hwmon_channel_info **info;
+	const struct hwmon_channel_info * const *info;
 };
 
 /* hwmon_device_register() is deprecated */