linux-kernel - Re: [PATCH v2 4/6] ASoC: sun4i-i2s: Add multi-lane functionality

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Message-ID: <20180313080026.jtag4w46koxzeqe2@flea>
Date:   Tue, 13 Mar 2018 09:00:26 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     codekipper@...il.com
Cc:     wens@...e.org, linux-sunxi@...glegroups.com,
        linux-arm-kernel@...ts.infradead.org, lgirdwood@...il.com,
        broonie@...nel.org, linux-kernel@...r.kernel.org,
        alsa-devel@...a-project.org, be17068@...rbole.bo.it
Subject: Re: [PATCH v2 4/6] ASoC: sun4i-i2s: Add multi-lane functionality

On Mon, Mar 12, 2018 at 04:57:51PM +0100, codekipper@...il.com wrote:
> From: Marcus Cooper <codekipper@...il.com>
> 
> The i2s block supports multi-lane i2s output however this functionality
> is only possible in earlier SoCs where the pins are exposed and for
> the i2s block used for HDMI audio on the later SoCs.
> 
> To enable this functionality, an optional property has been added to
> the bindings.
> 
> Signed-off-by: Marcus Cooper <codekipper@...il.com>
> ---
>  .../devicetree/bindings/sound/sun4i-i2s.txt        |  3 ++
>  sound/soc/sunxi/sun4i-i2s.c                        | 48 +++++++++++++++++-----
>  2 files changed, 41 insertions(+), 10 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/sound/sun4i-i2s.txt b/Documentation/devicetree/bindings/sound/sun4i-i2s.txt
> index 48addef65b8f..3f966ac61b9e 100644
> --- a/Documentation/devicetree/bindings/sound/sun4i-i2s.txt
> +++ b/Documentation/devicetree/bindings/sound/sun4i-i2s.txt
> @@ -33,6 +33,9 @@ Optional properties:
>  				configured to extend the slot width to the
>  				value specified. Min 8, Max 32.
>  
> +- allwinner,playback-channels:  if this property is present then the number
> +				of available channels is extended and the
> +				outputs enabled.

Isn't it something that is fixed for each generation of SoCs? Can't we
attach it to the compatible?

Maxime

-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

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