Re: [PATCH] ASoC: wm8903: add regulator handling

On 03/20/2017 03:13 AM, Linus Walleij wrote:

The WM8903 has four different voltage inputs: AVDD, CPVDD, DBVDD
and DCVDD. On the Qualcomm APQ8060 Dragonboard these are all
supplied from proper regulators and thus need activating and
binding.

This is a quick-and-dirty solution just grabbing and enabling the
regulator supplies on probe() and disabling them on remove() and
the errorpath. More elaborate power management is likely possible.

I assume the nVidia designs using this codec have some hard-wired
always-on power and will be happy with using the dummy regulators
for this. But someone from the nVidia camp should probably check
whether they can bind these to proper regulators instead.

We also amend the DT binding document. A small change like this
does not warrant a separate patch for augmenting these.

Tested-by: Stephen Warren <redacted>

Sorry for the slow response.

Tested using NVIDIA springbank/seaboard board. Just in case anyone reads 
this later and wonders how: I will point out that in the baseline 
v4.11-rc4, the LCD (or perhaps just its backlight) doesn't work on this 
HW any more, but since the GUI login prompt plays a sound, I was still 
able to validate the WM8903 change.
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