Re: [PATCH] backlight: Fix broken regulator API usage in l4f00242t03

The regulator support in the l4f00242t03 is very non-idiomatic, rather
than requesting the regulators based on the device name and the supply
names used by the device the driver requires boards to pass system
specific supply names around through platform data. The driver also
conditionally requests the regulators based on this platform data, adding
unneeded conditional code to the driver.

Fix this by removing the platform data and converting to the standard idiom,
also updating all in tree users of the driver. As no datasheet appears to
be available for the LCD I'm guessing the names for the supplies based on
the existing users and I've no ability to do anything more than compile
test.

The use of regulator_set_voltage() in the driver is also problematic, since
fixed voltages are required the expectation would be that the voltages
would be fixed in the constraints set by the machines rather than manually
configured by the driver, but is less problematic.

 static int l4f00242t03_lcd_power_get(struct lcd_device *ld)

@@ -202,24 +195,18 @@ static int __devinit l4f00242t03_probe(struct spi_device *spi)
 	if (ret)
 		goto err3;
 
-	if (pdata->io_supply) {
-		priv->io_reg = regulator_get(NULL, pdata->io_supply);
-
-		if (IS_ERR(priv->io_reg)) {
-			pr_err("%s: Unable to get the IO regulator\n",
-								__func__);
-			goto err3;
-		}
+	priv->io_reg = regulator_get(&spi->dev, "vdd");
+	if (IS_ERR(priv->io_reg)) {
+		pr_err("%s: Unable to get the IO regulator\n",
+		       __func__);
+		goto err3;
 	}
 
-	if (pdata->core_supply) {
-		priv->core_reg = regulator_get(NULL, pdata->core_supply);
-
-		if (IS_ERR(priv->core_reg)) {
-			pr_err("%s: Unable to get the core regulator\n",
-								__func__);
-			goto err4;
-		}
+	priv->core_reg = regulator_get(&spi->dev, "vcore");
+	if (IS_ERR(priv->core_reg)) {
+		pr_err("%s: Unable to get the core regulator\n",
+		       __func__);
+		goto err4;
 	}