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

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




On Mon, Mar 20, 2017 at 10:13:52AM +0100, 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.
> 
> Cc: devicetree@xxxxxxxxxxxxxxx
> Cc: Mark Brown <broonie@xxxxxxxxxx>
> Cc: Liam Girdwood <lgirdwood@xxxxxxxxx>
> Cc: Stephen Warren <swarren@xxxxxxxxxx>
> Cc: Charles Keepax <ckeepax@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
> ---
> Mark: I was thinking about adding runtime PM for disabling
> these regulators when unused, but I'm uncertain about the
> interaction with DAPM in that regard. This atleast gives us
> control over the supplies.

DAPM will hold a pm_runtime reference whilst the chip is active
so usually there isn't really much interaction to worry about.

I think the patch looks fine for a first pass adding the supplies
to me, someone can always add the suspend/resume and controlling
the supplies across that when they need it.

Acked-by: Charles Keepax <ckeepax@xxxxxxxxxxxxxxxxxxxxxxxxxxx>

Thanks,
Charles
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]
  Powered by Linux