[linux-sunxi][PATCH 5/5] arm64: allwinner: a64: Add DAI nodes

[Maxime Ripard]

On Wed, Jan 24, 2018 at 12:39:31PM +0100, Code Kipper wrote:
> On 24 January 2018 at 12:02, Maxime Ripard
> <maxime.ripard at free-electrons.com> wrote:
> > Hi,
> >
> > On Wed, Jan 24, 2018 at 11:39:43AM +0100, codekipper at gmail.com wrote:
> >> From: Marcus Cooper <codekipper at gmail.com>
> >>
> >> Add the DAI blocks to the device tree. I2S0 and I2S1 are for
> >> connecting to an external codec.
> >>
> >> Signed-off-by: Marcus Cooper <codekipper at gmail.com>
> >> ---
> >>  arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 26 ++++++++++++++++++++++++++
> >>  1 file changed, 26 insertions(+)
> >>
> >> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> >> index f060a58f374c..f3354f8c2026 100644
> >> --- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> >> +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> >> @@ -419,6 +419,32 @@
> >>                       status = "disabled";
> >>               };
> >>
> >> +             i2s0: i2s at 1c22000 {
> >> +                     #sound-dai-cells = <0>;
> >> +                     compatible = "allwinner,sun8i-h3-i2s";
> >
> > Same remark than for the spdif, please add a soc-specific compatible.
> 
> Is that really necessary?..

Yes.

> for example on the a20 the functionality of the i2s is the same as
> the a10 so it is down as "allwinner,sun4i-a10-i2s", likewise here
> it's the same as the changes required for the H3. I was planning on
> using the compatible "allwinner,sun50i-a64-i2s" for the audio codec
> as there are some quirks that need to be addressed.

And this is exactly why it is necessary. If we ever find a quirk in
the future, supporting that quirk will be smooth if we already have a
compatible for that SoC in the DT, and a pain if we don't.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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