linux-kernel - Re: [PATCH v6 1/3] dt-bindings: display: bridge: Document THC63LVD1024 LVDS decoder

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Message-ID: <1dd27170-153c-90f6-e13f-949ba7d0d4a9@samsung.com>
Date:   Tue, 27 Mar 2018 09:12:46 +0200
From:   Andrzej Hajda <a.hajda@...sung.com>
To:     Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>
Cc:     Rob Herring <robh@...nel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        architt@...eaurora.org, airlied@...ux.ie, horms@...ge.net.au,
        magnus.damm@...il.com, geert@...ux-m68k.org,
        niklas.soderlund@...natech.se, sergei.shtylyov@...entembedded.com,
        mark.rutland@....com, dri-devel@...ts.freedesktop.org,
        linux-renesas-soc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 1/3] dt-bindings: display: bridge: Document
 THC63LVD1024 LVDS decoder

On 27.03.2018 08:15, Vladimir Zapolskiy wrote:
> Hi Jacopo,
>
> On 03/27/2018 01:22 AM, Rob Herring wrote:
>> On Tue, Mar 20, 2018 at 02:43:33PM +0200, Laurent Pinchart wrote:
>>> Hi Jacopo,
>>>
>>> (CC'ing Rob)
>>>
>>> Thank you for the patch.
>>>
>>> On Friday, 16 March 2018 17:16:37 EET Jacopo Mondi wrote:
>>>> Document Thine THC63LVD1024 LVDS decoder device tree bindings.
>>>>
>>>> Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
>>>> Reviewed-by: Andrzej Hajda <a.hajda@...sung.com>
>>>> Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
>>>> ---
>>>>  .../bindings/display/bridge/thine,thc63lvd1024.txt | 66 +++++++++++++++++++
>>>>  1 file changed, 66 insertions(+)
>>>>  create mode 100644
>>>> Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.txt
>>>>
>>>> diff --git
>>>> a/Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.txt
>>>> b/Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.txt
>>>> new file mode 100644
>>>> index 0000000..8225c6a
>>>> --- /dev/null
>>>> +++
>>>> b/Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.txt
>>>> @@ -0,0 +1,66 @@
>>>> +Thine Electronics THC63LVD1024 LVDS decoder
>>>> +-------------------------------------------
>>>> +
>>>> +The THC63LVD1024 is a dual link LVDS receiver designed to convert LVDS
>>>> streams
>>>> +to parallel data outputs. The chip supports single/dual input/output modes,
>>>> +handling up to two two input LVDS stream and up to two digital CMOS/TTL
>>>> outputs.
>>>> +
>>>> +Single or dual operation modes, output data mapping and DDR output modes
>>>> are
>>>> +configured through input signals and the chip does not expose any control
>>>> bus.
>>>> +
>>>> +Required properties:
>>>> +- compatible: Shall be "thine,thc63lvd1024"
>>>> +
>>>> +Optional properties:
>>>> +- vcc-supply: Power supply for TTL output and digital circuitry
>>>> +- cvcc-supply: Power supply for TTL CLOCKOUT signal
>>>> +- lvcc-supply: Power supply for LVDS inputs
>>>> +- pvcc-supply: Power supply for PLL circuitry
>>> As explained in a comment to one of the previous versions of this series, I'm 
>>> tempted to make vcc-supply mandatory and drop the three other power supplies 
>>> for now, as I believe there's very little chance they will be connected to 
>>> separately controllable regulators (all supplies use the same voltage). In the 
>>> very unlikely event that this occurs in design we need to support in the 
>>> future, the cvcc, lvcc and pvcc supplies can be added later as optional 
>>> without breaking backward compatibility.
>> I'm okay with that.
>>
>>> Apart from that,
>>>
>>> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
>>>
>>>> +- pdwn-gpios: Power down GPIO signal. Active low
>> powerdown-gpios is the semi-standard name.
>>
> right, I've also noticed it. If possible please avoid shortenings in
> property names.

It is not shortening, it just follow pin name from decoder's datasheet.

>
>>>> +- oe-gpios: Output enable GPIO signal. Active high
>>>> +
> And this one is also a not ever met property name, please consider to
> rename it to 'enable-gpios', for instance display panels define it.


Again, it follows datasheet naming scheme. Has something changed in DT
conventions?

Regards
Andrzej

>
>>>> +The THC63LVD1024 video port connections are modeled according
>>>> +to OF graph bindings specified by
>>>> Documentation/devicetree/bindings/graph.txt
> [snip]
>
>>>> +
>>>> +			port@2{
>>>> +				reg = <2>;
>>>> +
>>>> +				lvds_dec_out_2: endpoint {
>>>> +					remote-endpoint = <&adv7511_in>;
>>>> +				};
>>>> +
> Drop a surplus empty line above.
>
>>>> +			};
>>>> +
> Drop a surplus empty line above.
>
>>>> +		};
>>>> +	};
> --
> With best wishes,
> Vladimir
>
>
>