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 swarren@nvidia.com
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.