Re: [PATCH 04/10] regulator: of: switch to using class_find_device_by_fwnode()

[Andrew Lunn]

> If there is a deprecated property you can do:
> 
> 	error = device_property_read_u32(dev, "prop", &val);
> 	if (error == -ENOENT)
> 		error = device_property_read_u32(dev, "deprecated-prop", &val);

It is not as simple as that. There are a lot of optional
properties. Say "prop" is optional? And not present. So -ENOENT. We
then look for this deprecated property. That should not happen.

Using of_property_read_u32(np, "deprecated-prop", &val) actually makes
it stand out, it is special somehow, which is good, because it is
special.

   Andrew