linux-kernel - Re: [RFC PATCH 01/34] ASoC: dt-bindings: Add a separate compatible for the A64 codec

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Date:   Mon, 17 Feb 2020 21:17:47 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <mripard@...nel.org>,
        Vasily Khoruzhick <anarsoul@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Ondrej Jirman <megous@...ous.com>
Subject: Re: [RFC PATCH 01/34] ASoC: dt-bindings: Add a separate compatible
 for the A64 codec

On 2/17/20 3:49 AM, Chen-Yu Tsai wrote:
> On Mon, Feb 17, 2020 at 2:42 PM Samuel Holland <samuel@...lland.org> wrote:
>>
>> The digital codec in the A64 is largely compatible with the one in the
>> A33, with two changes:
>>  - It is missing some muxing options for AIF1/2/3 (not currently
>>    supported by the driver)
> 
> Is this at the pinctrl level or mixer level? If it's at the pinctrl level
> then it's out of the scope of this driver/binding. It could very well have
> those signals, just that they aren't routed outside the SoC.

This is in reference to the muxes shown at the top of the A33 diagram, above the
I2S/PCM interfaces. These appear to map to bits 0-6 of AIF3_SGP_CTRL, which are
marked as reserved on the A64 and the AC100.

Comparing the three datasheets in a bit more detail (but by no means exhaustively):
 - The A64 has a second DRC block, unlike the A33 and AC100.
 - The jack detection registers (0x310-0x318) are present on the A64
   and AC100, but undocumented/missing on the A33.

So there are enough differences to warrant a new compatible, but since none of
the unique functionality is used by the driver (even after this series), a
fallback should work.