power: supply: ab8500_charger: Restrict ADC retrieveal

The AB8505 only has two ADC channels: the voltage and current
provided from VBUS (USB). It does not support AC charging at all.
Make sure we don't try to retrieve the non-existing channels.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

drivers/power/supply/ab8500_charger.c

@@ -3443,17 +3443,19 @@ static int ab8500_charger_probe(struct platform_device *pdev)
 	di->parent = dev_get_drvdata(pdev->dev.parent);
 
 	/* Get ADC channels */
-	di->adc_main_charger_v = devm_iio_channel_get(dev, "main_charger_v");
-	if (IS_ERR(di->adc_main_charger_v)) {
-		ret = dev_err_probe(dev, PTR_ERR(di->adc_main_charger_v),
-				    "failed to get ADC main charger voltage\n");
-		return ret;
-	}
-	di->adc_main_charger_c = devm_iio_channel_get(dev, "main_charger_c");
-	if (IS_ERR(di->adc_main_charger_c)) {
-		ret = dev_err_probe(dev, PTR_ERR(di->adc_main_charger_c),
-				    "failed to get ADC main charger current\n");
-		return ret;
+	if (!is_ab8505(di->parent)) {
+		di->adc_main_charger_v = devm_iio_channel_get(dev, "main_charger_v");
+		if (IS_ERR(di->adc_main_charger_v)) {
+			ret = dev_err_probe(dev, PTR_ERR(di->adc_main_charger_v),
+					    "failed to get ADC main charger voltage\n");
+			return ret;
+		}
+		di->adc_main_charger_c = devm_iio_channel_get(dev, "main_charger_c");
+		if (IS_ERR(di->adc_main_charger_c)) {
+			ret = dev_err_probe(dev, PTR_ERR(di->adc_main_charger_c),
+					    "failed to get ADC main charger current\n");
+			return ret;
+		}
 	}
 	di->adc_vbus_v = devm_iio_channel_get(dev, "vbus_v");
 	if (IS_ERR(di->adc_vbus_v)) {