# Re: \[PATCH 1/5\] dt-bindings: backlight: qcom-wled: Document ovp values for PMI8950

- From: \<hidden\>
- Date: 2026-01-08 02:45:16 
- List: linux-fbdev
- Page: https://ratatoskr.run/linux-fbdev/2026/01/3357553
- Thread: https://ratatoskr.run/dri-devel/2026/01/3356582/t.md

```text
On 2026-01-07 15:03, Konrad Dybcio wrote:
> On 1/7/26 2:31 PM, Barnabás Czémán wrote:
>> Document ovp values supported by wled found in PMI8950.
>>
>> Signed-off-by: Barnabás Czémán <redacted>
>> ---
>>  .../bindings/leds/backlight/qcom-wled.yaml           | 20 ++++++++++++++++++--
>>  1 file changed, 18 insertions(+), 2 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/leds/backlight/qcom-wled.yaml b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.yaml
>> index a8490781011d..306fb6642617 100644
>> --- a/Documentation/devicetree/bindings/leds/backlight/qcom-wled.yaml
>> +++ b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.yaml
>> @@ -98,8 +98,6 @@ properties:
>>      description: |
>>        Over-voltage protection limit. This property is for WLED4 only.
>>      $ref: /schemas/types.yaml#/definitions/uint32
>> -    enum: [ 18100, 19600, 29600, 31100 ]
>> -    default: 29600
>>
>>    qcom,num-strings:
>>      description: |
>> @@ -239,6 +237,24 @@ allOf:
>>            minimum: 0
>>            maximum: 4095
>>
>> +  - if:
>> +      properties:
>> +        compatible:
>> +          contains:
>> +            const: qcom,pmi8950-wled
>> +
>> +    then:
>> +      properties:
>> +        qcom,ovp-millivolt:
>> +          enum: [ 17800, 19400, 29500, 31000 ]
>> +          default: 29500
>> +
>> +    else:
>> +      properties:
>> +        qcom,ovp-millivolt:
>> +          enum: [ 18100, 19600, 29600, 31100 ]
>> +          default: 29600
>
> Out of the supported ones:
>
> { .compatible = "qcom,pmi8950-wled", .data = (void *)4 },
> { .compatible = "qcom,pmi8994-wled", .data = (void *)4 },
> { .compatible = "qcom,pmi8998-wled", .data = (void *)4 },
> { .compatible = "qcom,pm660l-wled", .data = (void *)4 },
>
> I can confirm both allowed and default values for PMI8950/98/PM660L
>
> I could not find any data for PMI8994 (or PMI8996, the essentially
> PMI8994-revbump), but it's very probable that 8950 is an oddball,
This commits add support for pmi8998 and documentation is telling which PMIC supports which values:
https://git.codelinaro.org/clo/la/kernel/msm-4.4/-/commit/7a1b6d0276828f270180db40935bb034a3470865
TLDR:
- qcom,ovp-mv		: Over voltage protection threshold in mV. Default is
			  29500. Supported values are:
			  - 31000, 29500, 19400, 17800 for pmi8994/8952/8996. (As far as i know 8952=8950)
			  - 31100, 29600, 19600, 18100 for pmicobalt/pm2falcon (pmi8998/pm660l)

> so:
>
> Reviewed-by: Konrad Dybcio <redacted>
>
> Konrad
```