linux-kernel - Re: [RESEND] [PATCH v2 2/4] dt-bindings: Add jdi lt070me05000 panel bindings

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Date:   Wed, 24 Aug 2016 17:34:55 +0530
From:   Vinay Simha <simhavcs@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Archit Taneja <archit.taneja@...il.com>,
        John Stultz <john.stultz@...aro.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        David Airlie <airlied@...ux.ie>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "open list:DRM PANEL DRIVERS" <dri-devel@...ts.freedesktop.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND] [PATCH v2 2/4] dt-bindings: Add jdi lt070me05000 panel bindings

thierry,

this is the reference pinouts of the panel
http://www.tonylabs.com/wp-content/uploads/LT070ME05000-pinouts.jpg

as you suggest , i will change the vcc-supply,

 - iovcc-supply: phandle of the regulator that supplies power to
          the IOVCC voltage input (1.8 V)

will keep the other two(vddp-supply, dcdc_en-supply) remaining same.

On Wed, Aug 24, 2016 at 5:15 PM, Thierry Reding
<thierry.reding@...il.com> wrote:
> On Sun, Jul 31, 2016 at 08:45:21PM +0530, Vinay Simha BN wrote:
>> Add documentation for lt070me05000 panel
>>
>> Cc: Archit Taneja <archit.taneja@...il.com>
>> Cc: John Stultz <john.stultz@...aro.org>
>> Cc: Thierry Reding <thierry.reding@...il.com>
>> Cc: Sumit Semwal <sumit.semwal@...aro.org>
>> Signed-off-by: Vinay Simha BN <simhavcs@...il.com>
>> Acked-by: Rob Herring <robh@...nel.org>
>>
>> ---
>> v2:
>>  * incorporated rob herring and thierry reviews
>>    gpio to gpios, gpio to regulator using fixed regulators
>>    and pwm backlight is removed, since it is controlled by
>>    dcs commands
>> ---
>>  .../bindings/display/panel/jdi,lt070me05000.txt    | 57 ++++++++++++++++++++++
>>  1 file changed, 57 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/display/panel/jdi,lt070me05000.txt
>>
>> diff --git a/Documentation/devicetree/bindings/display/panel/jdi,lt070me05000.txt b/Documentation/devicetree/bindings/display/panel/jdi,lt070me05000.txt
>> new file mode 100644
>> index 0000000..613b76f
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/display/panel/jdi,lt070me05000.txt
>> @@ -0,0 +1,57 @@
>> +JDI model LT070ME05000 1200x1920 7" DSI Panel
>> +
>> +Required properties:
>> +- compatible: should be "jdi,lt070me05000"
>> +- vddp-supply: phandle of the regulator that provides the supply voltage
>> +  Power IC supply (3-5V)
>> +- dcdc_en-supply: phandle of the regulator that provides the supply voltage
>> +  Power IC supply enable, High active
>> +- vcc-supply: phandle of the regulator that provides the supply voltage
>> +  IOVCC , power supply for LCM (1.8V)
>
> I was just going to apply this and wanted to add some information about
> how many lanes the panel uses, so I looked at the datasheet linked to in
> patch 4/4:
>
>         http://panelone.net/en/7-0-inch/JDI_LT070ME05000_7.0_inch-datasheet
>
> and noticed that the power supplies in the binding here don't match the
> ones listed in the datasheet. Granted, the datasheet is somewhat meager,
> but it lists the following three input voltages:
>
>         - IOVCC at 1.8 V
>         - VDD at 3.0 V
>         - VDDP at 3.0 V
>
> This matches in part what the above binding describes, but it's not
> quite right, so I'm wondering if the name for dcdc_en-supply came from
> the board schematics and reflects the name of the rail on the board
> design that provides this rather than the input voltage on the panel.
>
> I think we should follow the names in the panel datasheet so that people
> can more easily reference the correct regulators when using this panel
> on a different board. I'd suggest:
>
>         - iovcc-supply: phandle of the regulator that supplies power to
>           the IOVCC voltage input (1.8 V)
>         - vdd-supply: phandle of the regulator that supplies power to
>           the VDD voltage input (3.0 V)
>         - vddp-supply: phandle of the regulator that supplies power to
>           the VDDP voltage input (3.0 V)
>
> Any objections?
>
> Thierry



-- 
regards,
vinaysimha