power: supply: bq24190_charger: Fix "initializer element is not constant" error

When building with a version of GCC prior to 8.x, there is an error
around non-constant initializer elements:

  drivers/power/supply/bq24190_charger.c:1978:16: error: initializer element is not constant
     .vbus_desc = bq24190_vbus_desc,
                  ^~~~~~~~~~~~~~~~~
  drivers/power/supply/bq24190_charger.c:1978:16: note: (near initialization for 'bq24190_chip_info_tbl[0].vbus_desc')
  drivers/power/supply/bq24190_charger.c:1989:16: error: initializer element is not constant
     .vbus_desc = bq24190_vbus_desc,
                  ^~~~~~~~~~~~~~~~~
  drivers/power/supply/bq24190_charger.c:1989:16: note: (near initialization for 'bq24190_chip_info_tbl[1].vbus_desc')
  drivers/power/supply/bq24190_charger.c:2000:16: error: initializer element is not constant
     .vbus_desc = bq24190_vbus_desc,
                  ^~~~~~~~~~~~~~~~~
  drivers/power/supply/bq24190_charger.c:2000:16: note: (near initialization for 'bq24190_chip_info_tbl[2].vbus_desc')
  drivers/power/supply/bq24190_charger.c:2011:16: error: initializer element is not constant
     .vbus_desc = bq24190_vbus_desc,
                  ^~~~~~~~~~~~~~~~~
  drivers/power/supply/bq24190_charger.c:2011:16: note: (near initialization for 'bq24190_chip_info_tbl[3].vbus_desc')
  drivers/power/supply/bq24190_charger.c:2022:16: error: initializer element is not constant
     .vbus_desc = bq24296_vbus_desc,
                  ^~~~~~~~~~~~~~~~~
  drivers/power/supply/bq24190_charger.c:2022:16: note: (near initialization for 'bq24190_chip_info_tbl[4].vbus_desc')

Clang versions prior to 17.x show a similar error:

  drivers/power/supply/bq24190_charger.c:1978:16: error: initializer element is not a compile-time constant
                  .vbus_desc = bq24190_vbus_desc,
                               ^~~~~~~~~~~~~~~~~
  1 error generated.

Newer compilers have decided to accept these structures as compile time
constants as an extension. To resolve this issue for all supported
compilers, change the vbus_desc member in 'struct bq24190_chip_info' to
a pointer, as it is only ever passed by reference anyways, and adjust
the assignments accordingly.

Closes: ClangBuiltLinux#1973
Fixes: b150a70 ("power: supply: bq24190_charger: Add support for BQ24296")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Justin Stitt <justinstitt@google.com>
Link: https://lore.kernel.org/r/20240103-fix-bq24190_charger-vbus_desc-non-const-v1-1-115ddf798c70@kernel.org
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

Author: nathanchance

drivers/power/supply/bq24190_charger.c

@@ -246,7 +246,7 @@ struct bq24190_dev_info {
 struct bq24190_chip_info {
 	int ichg_array_size;
 #ifdef CONFIG_REGULATOR
-	const struct regulator_desc vbus_desc;
+	const struct regulator_desc *vbus_desc;
 #endif
 	int (*check_chip)(struct bq24190_dev_info *bdi);
 	int (*set_chg_config)(struct bq24190_dev_info *bdi, const u8 chg_config);
@@ -728,7 +728,7 @@ static int bq24190_register_vbus_regulator(struct bq24190_dev_info *bdi)
 	else
 		cfg.init_data = &bq24190_vbus_init_data;
 	cfg.driver_data = bdi;
-	reg = devm_regulator_register(bdi->dev, &bdi->info->vbus_desc, &cfg);
+	reg = devm_regulator_register(bdi->dev, bdi->info->vbus_desc, &cfg);
 	if (IS_ERR(reg)) {
 		ret = PTR_ERR(reg);
 		dev_err(bdi->dev, "Can't register regulator: %d\n", ret);
@@ -1975,7 +1975,7 @@ static const struct bq24190_chip_info bq24190_chip_info_tbl[] = {
 	[BQ24190] = {
 		.ichg_array_size = ARRAY_SIZE(bq24190_ccc_ichg_values),
 #ifdef CONFIG_REGULATOR
-		.vbus_desc = bq24190_vbus_desc,
+		.vbus_desc = &bq24190_vbus_desc,
 #endif
 		.check_chip = bq24190_check_chip,
 		.set_chg_config = bq24190_battery_set_chg_config,
@@ -1986,7 +1986,7 @@ static const struct bq24190_chip_info bq24190_chip_info_tbl[] = {
 	[BQ24192] = {
 		.ichg_array_size = ARRAY_SIZE(bq24190_ccc_ichg_values),
 #ifdef CONFIG_REGULATOR
-		.vbus_desc = bq24190_vbus_desc,
+		.vbus_desc = &bq24190_vbus_desc,
 #endif
 		.check_chip = bq24190_check_chip,
 		.set_chg_config = bq24190_battery_set_chg_config,
@@ -1997,7 +1997,7 @@ static const struct bq24190_chip_info bq24190_chip_info_tbl[] = {
 	[BQ24192i] = {
 		.ichg_array_size = ARRAY_SIZE(bq24190_ccc_ichg_values),
 #ifdef CONFIG_REGULATOR
-		.vbus_desc = bq24190_vbus_desc,
+		.vbus_desc = &bq24190_vbus_desc,
 #endif
 		.check_chip = bq24190_check_chip,
 		.set_chg_config = bq24190_battery_set_chg_config,
@@ -2008,7 +2008,7 @@ static const struct bq24190_chip_info bq24190_chip_info_tbl[] = {
 	[BQ24196] = {
 		.ichg_array_size = ARRAY_SIZE(bq24190_ccc_ichg_values),
 #ifdef CONFIG_REGULATOR
-		.vbus_desc = bq24190_vbus_desc,
+		.vbus_desc = &bq24190_vbus_desc,
 #endif
 		.check_chip = bq24190_check_chip,
 		.set_chg_config = bq24190_battery_set_chg_config,
@@ -2019,7 +2019,7 @@ static const struct bq24190_chip_info bq24190_chip_info_tbl[] = {
 	[BQ24296] = {
 		.ichg_array_size = BQ24296_CCC_ICHG_VALUES_LEN,
 #ifdef CONFIG_REGULATOR
-		.vbus_desc = bq24296_vbus_desc,
+		.vbus_desc = &bq24296_vbus_desc,
 #endif
 		.check_chip = bq24296_check_chip,
 		.set_chg_config = bq24296_battery_set_chg_config,