power: axp221: Remove switch case to simplify axp_set_eldo

The ELDO enable bits and registers are contiguous for axp221. Instead
of a switch case testing against the index, just use the index to shift
the bit or register offset.
Signed-off-by: NChen-Yu Tsai <wens@csie.org>
Reviewed-by: NHans de Goede <hdegoede@redhat.com>
Signed-off-by: NHans de Goede <hdegoede@redhat.com>

drivers/power/axp221.c

@@ -191,33 +191,20 @@ int axp_set_eldo(int eldo_num, unsigned int mvolt)
 {
 	int ret;
 	u8 cfg = axp221_mvolt_to_cfg(mvolt, 700, 3300, 100);
-	u8 addr, bits;
-
-	switch (eldo_num) {
-	case 3:
-		addr = AXP221_ELDO3_CTRL;
-		bits = AXP221_OUTPUT_CTRL2_ELDO3_EN;
-		break;
-	case 2:
-		addr = AXP221_ELDO2_CTRL;
-		bits = AXP221_OUTPUT_CTRL2_ELDO2_EN;
-		break;
-	case 1:
-		addr = AXP221_ELDO1_CTRL;
-		bits = AXP221_OUTPUT_CTRL2_ELDO1_EN;
-		break;
-	default:
+
+	if (eldo_num < 1 || eldo_num > 3)
 		return -EINVAL;
-	}
 
 	if (mvolt == 0)
-		return pmic_bus_clrbits(AXP221_OUTPUT_CTRL2, bits);
+		return pmic_bus_clrbits(AXP221_OUTPUT_CTRL2,
+				AXP221_OUTPUT_CTRL2_ELDO1_EN << (eldo_num - 1));
 
-	ret = pmic_bus_write(addr, cfg);
+	ret = pmic_bus_write(AXP221_ELDO1_CTRL + (eldo_num - 1), cfg);
 	if (ret)
 		return ret;
 
-	return pmic_bus_setbits(AXP221_OUTPUT_CTRL2, bits);
+	return pmic_bus_setbits(AXP221_OUTPUT_CTRL2,
+				AXP221_OUTPUT_CTRL2_ELDO1_EN << (eldo_num - 1));
 }
 
 int axp_init(void)