linux-kernel - Re: [PATCH v2 1/2] dt-bindings/display/bridge: sii902x: add optional power supplies

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Message-ID: <e18d1a3b-a2eb-74f2-ab88-7bf01af0754b@st.com>
Date:   Wed, 25 Apr 2018 12:20:04 +0000
From:   Philippe CORNU <philippe.cornu@...com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
CC:     Archit Taneja <architt@...eaurora.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        David Airlie <airlied@...ux.ie>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Yannick FERTRE <yannick.fertre@...com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Alexandre TORGUE <alexandre.torgue@...com>
Subject: Re: [PATCH v2 1/2] dt-bindings/display/bridge: sii902x: add optional
 power supplies

Hi Laurent & Rob :-)

On 04/25/2018 11:01 AM, Laurent Pinchart wrote:
> Hi Philippe,
> 
> Thank you for the patch.
> 
> On Wednesday, 25 April 2018 10:53:13 EEST Philippe Cornu wrote:
>> Add optional power supplies using the description found in
>> "SiI9022A/SiI9024A HDMI Transmitter Data Sheet (August 2016)".
>>
>> There is a single 1v2 supply voltage named vcc12 from which cvcc12
>> (digital core) and avcc12 (TMDS analog) are derived because according
>> to this data sheet:
>> "cvcc12 and avcc12 can be derived from the same power source"
> 
> Shouldn't the power supplies be mandatory, as explained by Mark in https://
> lists.freedesktop.org/archives/dri-devel/2018-April/172400.html ?
> 

Laurent,
Many thanks Laurent for your comment, I understood the merge of the two 
1v2 power supplies but missed the "mandatory" part... maybe because this 
patch (with optional power supplies) already got the reviewed-by from 
Rob, I thought the discussion thread you pointed out was applicable 
"only" to totally new driver documentation.

So, on my side, as a "new user" of sii902x IC, no problem to put these 
power supplies as mandatory instead of optional properties but I would 
like to be sure this is applicable to both old and new bindings doc : )

Rob,
could you please confirm these power supply properties should be 
"mandatory"?
if yes, should we then modify other optional properties like the 
reset-gpios too in the future?

Big thanks to both of you,
Philippe :-)

>> Signed-off-by: Philippe Cornu <philippe.cornu@...com>
>> ---
>>   Documentation/devicetree/bindings/display/bridge/sii902x.txt | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/display/bridge/sii902x.txt
>> b/Documentation/devicetree/bindings/display/bridge/sii902x.txt index
>> 56a3e68ccb80..9fb41fc9af51 100644
>> --- a/Documentation/devicetree/bindings/display/bridge/sii902x.txt
>> +++ b/Documentation/devicetree/bindings/display/bridge/sii902x.txt
>> @@ -8,6 +8,8 @@ Optional properties:
>>   	- interrupts-extended or interrupt-parent + interrupts: describe
>>   	  the interrupt line used to inform the host about hotplug events.
>>   	- reset-gpios: OF device-tree gpio specification for RST_N pin.
>> +	- iovcc-supply: I/O supply voltage (1.8V or 3.3V, host-dependent).
>> +	- vcc12-supply: TMDS analog & digital core supply voltage (1.2V).
>>
>>   Optional subnodes:
>>   	- video input: this subnode can contain a video input port node
>