[RFC PATCH 01/16] ASoC: pcm512x: expose 6 GPIOs

[Pierre-Louis Bossart]

On 4/16/20 6:42 AM, Linus Walleij wrote:
> On Tue, Apr 14, 2020 at 7:09 PM Andy Shevchenko
> <andriy.shevchenko at linux.intel.com> wrote:
>> On Thu, Apr 09, 2020 at 02:58:26PM -0500, Pierre-Louis Bossart wrote:
>>> The GPIOs are used e.g. on HifiBerry DAC+ HATs to control the LED
>>> (GPIO3) and the choice of the 44.1 (GPIO6) or 48 (GPIO3) kHz
>>> oscillator (when present).
>>>
>>> Enable basic gpio_chip to get/set values and get/set
>>> directions. Tested with GPIO_LIB from sys/class/gpio, the LED turns
>>> on/off as desired.
>>
>>
>> One question, can this use existing GPIO infrastructure, like bgpio_init()?
>> Ah, I see, that one operates over MMIO, while we would need something based on
>> regmap API.
>>
>> Bartosz, do we have plans to have bgpio_regmap_init() or alike?
> 
> Michael Walle is working on that:
> https://lore.kernel.org/linux-gpio/20200402203656.27047-11-michael@walle.cc/
> 
> I think we should try to merge it sooner rather than later.
> I can provide an ib-* branch for ASoC whenever we agreed
> on a basic generic driver.

Thanks for the pointer, I will give it a try.