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

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Message-ID: <ca446f4b-d918-fe6d-f6bd-4aa07efbefac@st.com>
Date:   Fri, 5 Jul 2019 12:35:14 +0000
From:   Philippe CORNU <philippe.cornu@...com>
To:     Olivier MOYSAN <olivier.moysan@...com>,
        "a.hajda@...sung.com" <a.hajda@...sung.com>,
        "narmstrong@...libre.com" <narmstrong@...libre.com>,
        "Laurent.pinchart@...asonboard.com" 
        <Laurent.pinchart@...asonboard.com>,
        "jonas@...boo.se" <jonas@...boo.se>,
        "jernej.skrabec@...l.net" <jernej.skrabec@...l.net>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Benjamin GAIGNARD <benjamin.gaignard@...com>,
        Alexandre TORGUE <alexandre.torgue@...com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "jsarha@...com" <jsarha@...com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 2/3] dt-bindings: display: sii902x: Change audio mclk
 binding

Hi Olivier,
and many thanks for your patch.
I have double checked in the sil9022/24 datasheet and you are right:

"As an option, the original MCLK signal used to strobe the I2S signals 
out from the sourcing chip can be used. If the internal PLL is used, 
then an external MCLK input is not required."

So, even if #sound-dai-cells is there, this is not mandatory to have MCLK.

Reviewed-by: Philippe Cornu <philippe.cornu@...com>
Philippe :-)


On 7/2/19 5:47 PM, 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>
> ---
>   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.
>   
>