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

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Date:   Tue, 27 Mar 2018 11:30:29 +0300
From:   Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>
To:     Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        jacopo mondi <jacopo@...ndi.org>,
        Andrzej Hajda <a.hajda@...sung.com>
CC:     Jacopo Mondi <jacopo+renesas@...ndi.org>,
        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>, <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

Hi Sergei,

On 03/27/2018 11:27 AM, Sergei Shtylyov wrote:
> Hello!
> 
> On 3/27/2018 10:33 AM, 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?
>>
>> Seconded. My understanding is that the property name should reflect
>> what reported in the the chip manual. For THC63LVD1024 the enable and
>> power down pins are named 'OE' and 'PDWN' respectively.
> 
>     But don't we need the vendor prefix in the prop names then, like 
> "renesas,oe-gpios" then?
> 

Seconded, with a correction to "thine,oe-gpios".

If vendor agnostic properties are supposed to be used, then please follow
the referenced by Rob semi-standard notations.

--
With best wishes,
Vladimir