[bug] regulator: fixed, gpio: probe fails on unset regulator-name

[Harald Geyer <harald@ccbib.org>]

Hi!

Documentation/devicetree/bindings/regulator/regulator.txt says that the
regulator-name property is optional. However fixed and gpio regulators
fail in probe with the following message, if the property is not 
present:

| reg-fixed-voltage regulators:sensor_supply: Failed to allocate supply 
name
| reg-fixed-voltage: probe of regulators:sensor_supply failed with 
error -12

This is caused by the following code in both drivers:
         drvdata->desc.name = devm_kstrdup(&pdev->dev,
                                           config->supply_name,
                                           GFP_KERNEL);
         if (drvdata->desc.name == NULL) {
                 dev_err(&pdev->dev, "Failed to allocate supply 
name\n");
                 return -ENOMEM;
         }

If config->supply_name == NULL, then devm_kstrdup() also returns NULL.

I don't know whether the binding document or the implementation is 
wrong,
so can't propose a fix for this. Sorry.

TIA,
Harald

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