power: supply: core: constify power_supply_battery_info::resist_table

The power supply core never modifies the resist table.
Reflect this in the API, so drivers can mark their static tables as
const.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20241005-power-supply-battery-const-v1-1-c1f721927048@weissschuh.net
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

Author: t-8ch

drivers/power/supply/power_supply_core.c

@@ -798,7 +798,7 @@ int power_supply_get_battery_info(struct power_supply *psy,
 		goto out_ret_pointer;
 
 	info->resist_table_size = len / (2 * sizeof(__be32));
-	resist_table = info->resist_table = devm_kcalloc(&psy->dev,
+	info->resist_table = resist_table = devm_kcalloc(&psy->dev,
 							 info->resist_table_size,
 							 sizeof(*resist_table),
 							 GFP_KERNEL);
@@ -982,7 +982,7 @@ EXPORT_SYMBOL_GPL(power_supply_battery_info_get_prop);
  *
  * Return: the battery internal resistance percent
  */
-int power_supply_temp2resist_simple(struct power_supply_resistance_temp_table *table,
+int power_supply_temp2resist_simple(const struct power_supply_resistance_temp_table *table,
 				    int table_len, int temp)
 {
 	int i, high, low;

include/linux/power_supply.h

@@ -752,7 +752,7 @@ struct power_supply_battery_info {
 	int temp_max;
 	struct power_supply_battery_ocv_table *ocv_table[POWER_SUPPLY_OCV_TEMP_MAX];
 	int ocv_table_size[POWER_SUPPLY_OCV_TEMP_MAX];
-	struct power_supply_resistance_temp_table *resist_table;
+	const struct power_supply_resistance_temp_table *resist_table;
 	int resist_table_size;
 	const struct power_supply_vbat_ri_table *vbat2ri_discharging;
 	int vbat2ri_discharging_size;
@@ -805,7 +805,7 @@ power_supply_find_ocv2cap_table(struct power_supply_battery_info *info,
 extern int power_supply_batinfo_ocv2cap(struct power_supply_battery_info *info,
 					int ocv, int temp);
 extern int
-power_supply_temp2resist_simple(struct power_supply_resistance_temp_table *table,
+power_supply_temp2resist_simple(const struct power_supply_resistance_temp_table *table,
 				int table_len, int temp);
 extern int power_supply_vbat2ri(struct power_supply_battery_info *info,
 				int vbat_uv, bool charging);