linux-kernel - Re: [PATCH 1/4] ARM: dts: exynos5250: Add #sound-dai-cells property to hdmi device node

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Date:   Wed, 14 Mar 2018 11:33:37 +0100
From:   Sylwester Nawrocki <s.nawrocki@...sung.com>
To:     Inki Dae <inki.dae@...sung.com>
Cc:     krzk@...nel.org, kgene@...nel.org, devicetree@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        b.zolnierkie@...sung.com, m.szyprowski@...sung.com
Subject: Re: [PATCH 1/4] ARM: dts: exynos5250: Add #sound-dai-cells property
 to hdmi device node

Hi Inki,

On 03/12/2018 01:48 AM, Inki Dae wrote:
> Thanks for explanation. By the way, who binds '#sound-dai-cells' property?.
> This patch adds this property to hdmi device node which will be bound by 
> HDMI driver fo Exynos DRM but I don't see any place to bind '#sound-dai-cells' 
> property in this driver.
> So I think some driver like Odroid XU3/4 audio driver(sound/soc/samsung/odroid.c) 
> or ASoC simple audio card driver(sound/soc/generic/simple-card.c) should exist 
> and this property should be placed to such device node.

The *-cells property is supposed to be in a node that a phandle points to,
and in this case the phandle entry in 'sound-dai' points to the hdmi node.
>From the DT bindings perspective it not that important how Linux parses
the bindings, it's more a matter of describing the HW configuration.

There is even a related check in dtc:

$ grep -n sound scripts/dtc/checks.c
1208:WARNING_PROPERTY_PHANDLE_CELLS(sound_dai, "sound-dai", "#sound-dai-cells");

-- 
Regards,
Sylwester