mfd: axp20x: Ensure relationship between IDs and model names

At the moment there is an implicit relationship between the AXP model
IDs and the order of the strings in the axp20x_model_names[] array.
This is fragile, and makes adding IDs in the middle error prone.

Make this relationship official by changing the ID type to the actual
enum used, and using indexed initialisers for the string list.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Link: https://lore.kernel.org/r/20241007001408.27249-3-andre.przywara@arm.com
Signed-off-by: Lee Jones <lee@kernel.org>

drivers/mfd/axp20x.c

@@ -34,20 +34,20 @@
 #define AXP806_REG_ADDR_EXT_ADDR_SLAVE_MODE	BIT(4)
 
 static const char * const axp20x_model_names[] = {
-	"AXP152",
-	"AXP192",
-	"AXP202",
-	"AXP209",
-	"AXP221",
-	"AXP223",
-	"AXP288",
-	"AXP313a",
-	"AXP717",
-	"AXP803",
-	"AXP806",
-	"AXP809",
-	"AXP813",
-	"AXP15060",
+	[AXP152_ID] = "AXP152",
+	[AXP192_ID] = "AXP192",
+	[AXP202_ID] = "AXP202",
+	[AXP209_ID] = "AXP209",
+	[AXP221_ID] = "AXP221",
+	[AXP223_ID] = "AXP223",
+	[AXP288_ID] = "AXP288",
+	[AXP313A_ID] = "AXP313a",
+	[AXP717_ID] = "AXP717",
+	[AXP803_ID] = "AXP803",
+	[AXP806_ID] = "AXP806",
+	[AXP809_ID] = "AXP809",
+	[AXP813_ID] = "AXP813",
+	[AXP15060_ID] = "AXP15060",
 };
 
 static const struct regmap_range axp152_writeable_ranges[] = {
@@ -1345,7 +1345,7 @@ int axp20x_match_device(struct axp20x_dev *axp20x)
 		axp20x->regmap_irq_chip = &axp15060_regmap_irq_chip;
 		break;
 	default:
-		dev_err(dev, "unsupported AXP20X ID %lu\n", axp20x->variant);
+		dev_err(dev, "unsupported AXP20X ID %u\n", axp20x->variant);
 		return -EINVAL;
 	}
 

drivers/regulator/axp20x-regulator.c

@@ -1597,7 +1597,7 @@ static int axp20x_regulator_probe(struct platform_device *pdev)
 		nregulators = AXP15060_REG_ID_MAX;
 		break;
 	default:
-		dev_err(&pdev->dev, "Unsupported AXP variant: %ld\n",
+		dev_err(&pdev->dev, "Unsupported AXP variant: %d\n",
 			axp20x->variant);
 		return -EINVAL;
 	}

include/linux/mfd/axp20x.h

@@ -959,7 +959,7 @@ struct axp20x_dev {
 	unsigned long			irq_flags;
 	struct regmap			*regmap;
 	struct regmap_irq_chip_data	*regmap_irqc;
-	long				variant;
+	enum axp20x_variants		variant;
 	int                             nr_cells;
 	const struct mfd_cell           *cells;
 	const struct regmap_config	*regmap_cfg;