Re: [PATCH 02/12] arch: arm64: qcom: sdm845-enchilada: Specify panel name within the compatible

[Krzysztof Kozlowski <krzk@kernel.org>]

On 05/11/2025 01:55, Dmitry Baryshkov wrote:
> On Tue, Nov 04, 2025 at 11:16:10PM +0100, David Heidelberg via B4 Relay wrote:
>> From: David Heidelberg <david@ixit.cz>
>>
>> sofef00 is name of the DDIC, it doesn't contain name of the panel used.
>> The DDIC is also paired with other panels, so make clear which panel is
>> used.
>>
>> cosmetic: sort the node.
>>
>> Signed-off-by: David Heidelberg <david@ixit.cz>
>> ---
>>  arch/arm64/boot/dts/qcom/sdm845-oneplus-enchilada.dts | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/sdm845-oneplus-enchilada.dts b/arch/arm64/boot/dts/qcom/sdm845-oneplus-enchilada.dts
>> index a259eb9d45ae0..8aead6dc25e00 100644
>> --- a/arch/arm64/boot/dts/qcom/sdm845-oneplus-enchilada.dts
>> +++ b/arch/arm64/boot/dts/qcom/sdm845-oneplus-enchilada.dts
>> @@ -31,9 +31,9 @@ battery: battery {
>>  };
>>  
>>  &display_panel {
>> -	status = "okay";
>> +	compatible = "samsung,sofef00-ams628nw01", "samsung,sofef00";
> 
> This breaks the ABI. Please describe, why it is sensible. Other patches
> should describe whether the old DTs will continue to work or not.
> 
>>  
>> -	compatible = "samsung,sofef00";


If I read the hunk correctly, I do not see any ABI break here. What
exactly stops working or is negatively affected that it is called an ABI
break?

Best regards,
Krzysztof