linux-kernel - Re: [PATCH 1/4] dt-bindings: sound: sun4i-spdif: Add Allwinner H6 compatible

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Date:   Mon, 15 Apr 2019 10:09:11 +0200
From:   Clément Péron <peron.clem@...il.com>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Icenowy Zheng <icenowy@...c.io>,
        Jagan Teki <jagan@...rulasolutions.com>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH 1/4] dt-bindings: sound: sun4i-spdif: Add Allwinner H6 compatible

Hi,

On Mon, 15 Apr 2019 at 10:04, Maxime Ripard <maxime.ripard@...tlin.com> wrote:
>
> Hi,
>
> On Thu, Apr 11, 2019 at 11:44:19PM +0200, Clément Péron wrote:
> > Allwinner H6 has a SPDIF controller with an increase of the fifo
> > size and the possibility to output the master clock.
> > However it's still compatible with the already existing driver for
> > Allwiner H3.
> >
> > Add this compatible in the device-tree bindings documentation.
>
> How was this tested?

Using Alsa utils on a Beelink GS1 and I check correct output sound on
my home cinema.
>
> After looking at the datasheet, it looks like it's still significantly
> different. In particular:
>
>   - The MCLK divider isn't at the same offset
We don't use the MCLK
>   - The bits to flush the FIFO aren't at the same offset
>   - The FIFO trigger levels aren't at the same offset
>   - The FIFO status register layout is almost entirely different
We use DMA not FIFO

Clement
>
> So it doesn't really look compatible to me
>
> Maxime
>
> --
> Maxime Ripard, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com