Re: [PATCH v2 2/4] arm64: dts: qcom: shikra-cqm-evk: Enable display and add ili7807s panel

[Arpit Saini <arpit.saini@oss.qualcomm.com>]

Hi Konrad,

On 7/10/2026 2:31 PM, Arpit Saini wrote:
> Hi Konrad,
>
> On 7/6/2026 3:33 PM, Konrad Dybcio wrote:
>> On 7/6/26 8:04 AM, Nabige Aala wrote:
>>> From: Arpit Saini <arpit.saini@oss.qualcomm.com>
>>>
>>> Enable the Qualcomm Shikra MDSS display subsystem on the Shikra CQM EVK
>>> board and add the DLC0697 MIPI DSI display panel node. Pin pm4125_l5
>>> to 1.232V with regulator-allow-set-load for DSI PHY PLL stability.
>>>
>>> Signed-off-by: Arpit Saini <arpit.saini@oss.qualcomm.com>
>>> Signed-off-by: Nabige Aala <nabige.aala@oss.qualcomm.com>
>>> ---
>> [...]
>>
>>> +    panel_bl_en: panel-bl-en-state {
>>> +        pins = "gpio91";
>>> +        function = "gpio";
>>> +        drive-strength = <2>;
>>> +        bias-disable;
>>> +        output-high;
>>> +    };
>>> +
>>> +    panel_bl_en_suspend: panel-bl-en-suspend-state {
>>> +        pins = "gpio91";
>>> +        function = "gpio";
>>> +        drive-strength = <2>;
>>> +        bias-pull-down;
>>> +        output-low;
>>> +    };
>> output-foo isn't necessary, the panel driver will assert it as
>> necessary
>>
>> Konrad
>
> Ack, thanks for pointing out.
>
> Arpit
>
I just checked,

Normally the backlight EN pin is controlled by a backlight driver.

However, this panel uses MIPI DCS based backlight control with no

separate backlight driver. Since there is no driver to assert gpio91,

we control it via the panel's pinctrl default state..

So this is platform specific pin , we need this to enable/disable

the backlight.


Thanks,

Arpit