Re: [PATCH 1/6] staging: iio: set proper supply name to devm_regulator_get()

From: Jonathan Cameron
Date: Sat Nov 05 2016 - 12:14:39 EST

On 05/11/16 12:58, Jonathan Cameron wrote:
> On 01/11/16 19:58, Lars-Peter Clausen wrote:
>> On 11/01/2016 05:03 AM, Matt Ranostay wrote:
>>> On Mon, Oct 31, 2016 at 10:04 AM, Eva Rachel Retuya <eraretuya@xxxxxxxxx> wrote:
>>>> The name passed to devm_regulator_get() should match the name of the
>>>> supply as specified in the device datasheet. This makes it clear what
>>>> power supply is being referred to in case of presence of other
>>>> regulators.
>>>> Currently, the supply name specified on the affected devices is 'vcc'.
>>>> Use lowercase version of the datasheet name to specify the supply
>>>> voltage.
>>> Aren't we possibly breaking current device tree definitions that
>>> people may have? We should still check the old name after the new
>>> datasheet name in my opinion.
>> None of those drivers have DT bindings, so I think we are OK. And they are
>> in staging anyway.
> I agree on this. These are technically in kernel interfaces so we
> are fine to change them. Would have been more interesting if
> there were DT bindings however and we would have had to support
> the old and new naming for a while at least (i.e. probably forever
> as we'd never get around to cleaning it up!)
Of course, the old 'magic matching' that i2c and spi do which could allow
these devices to be instantiated with regulators from the device tree
makes it just possible someone is doing this.

We'll take the good kernel approach of perhaps considering a adding
in compatibility support for the old option if someone screams.

We are find for some of them though as they NEED platform data to probe
anyway which device tree obviously can't magically supply.

The ad7780 is the only risky one I think.

> Jonathan
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