linux-kernel - Re: [PATCH 2/3] dt-bindings: display: sii902x: Change audio mclk binding

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Date:   Thu, 4 Jul 2019 11:25:25 +0300
From:   Jyri Sarha <jsarha@...com>
To:     Olivier Moysan <olivier.moysan@...com>, <a.hajda@...sung.com>,
        <narmstrong@...libre.com>, <Laurent.pinchart@...asonboard.com>,
        <jonas@...boo.se>, <jernej.skrabec@...l.net>, <airlied@...ux.ie>,
        <daniel@...ll.ch>, <dri-devel@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>, <benjamin.gaignard@...com>,
        <alexandre.torgue@...com>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-stm32@...md-mailman.stormreply.com>, <robh+dt@...nel.org>,
        <mark.rutland@....com>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH 2/3] dt-bindings: display: sii902x: Change audio mclk
 binding

On 02/07/2019 18:47, Olivier Moysan wrote:
> As stated in SiL9022/24 datasheet, master clock is not required for I2S.
> Make mclk property optional in DT bindings.
> 
> Fixes: 3f18021f43a3 ("dt-bindings: display: sii902x: Add HDMI audio bindings")
> 
> Signed-off-by: Olivier Moysan <olivier.moysan@...com>

Looking the specs again it looks like the mclk is requred for sii9020,
but not for sii9022 and sii9024.

So I guess it is fine to accept the configurations without the mclk.

Reviewed-by: Jyri Sarha <jsarha@...com>

> ---
>  Documentation/devicetree/bindings/display/bridge/sii902x.txt | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/sii902x.txt b/Documentation/devicetree/bindings/display/bridge/sii902x.txt
> index 2df44b7d3821..6e14e087c0d0 100644
> --- a/Documentation/devicetree/bindings/display/bridge/sii902x.txt
> +++ b/Documentation/devicetree/bindings/display/bridge/sii902x.txt
> @@ -26,9 +26,8 @@ Optional properties:
>  	- clocks: phandle and clock specifier for each clock listed in
>             the clock-names property
>  	- clock-names: "mclk"
> -	   Describes SII902x MCLK input. MCLK is used to produce
> -	   HDMI audio CTS values. This property is required if
> -	   "#sound-dai-cells"-property is present. This property follows
> +	   Describes SII902x MCLK input. MCLK can be used to produce
> +	   HDMI audio CTS values. This property follows
>  	   Documentation/devicetree/bindings/clock/clock-bindings.txt
>  	   consumer binding.
>  
> 


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