linux-kernel - Re: [PATCH 1/1] dt-bindings: ata: ahci-fsl-qoriq: add fsl,ls1046a-ahci and fsl,ls1012a-ahci

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Message-ID: <e6e72e16-9304-40f3-99b2-cd4a53e5f8f3@kernel.org>
Date: Fri, 5 Jul 2024 08:06:18 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Damien Le Moal <dlemoal@...nel.org>, Frank Li <Frank.li@....com>
Cc: Niklas Cassel <cassel@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>,
 "open list:LIBATA SUBSYSTEM (Serial and Parallel ATA drivers)"
 <linux-ide@...r.kernel.org>,
 "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
 <devicetree@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>,
 imx@...ts.linux.dev
Subject: Re: [PATCH 1/1] dt-bindings: ata: ahci-fsl-qoriq: add
 fsl,ls1046a-ahci and fsl,ls1012a-ahci

On 05/07/2024 02:20, Damien Le Moal wrote:
> On 7/3/24 05:45, Frank Li wrote:
>> On Wed, Jun 26, 2024 at 10:17:55AM +0200, Krzysztof Kozlowski wrote:
>>> On 25/06/2024 22:57, Frank Li wrote:
>>>> Add compatible string 'fsl,ls1046a-ahci' and 'fsl,ls1012a-ahci' compatible
>>>> string. Allow 'fsl,ls1012a-ahci' fallback to 'fsl,ls1043a-ahci'.
>>>>
>>>> ls1046a ahci ecc disable bit is difference with other chips.
>>>>
>>>> Signed-off-by: Frank Li <Frank.Li@....com>
>>>> ---
>>>>  .../devicetree/bindings/ata/fsl,ahci.yaml     | 19 ++++++++++++-------
>>>>  1 file changed, 12 insertions(+), 7 deletions(-)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/ata/fsl,ahci.yaml b/Documentation/devicetree/bindings/ata/fsl,ahci.yaml
>>>> index 162b3bb5427ed..a244bc603549d 100644
>>>> --- a/Documentation/devicetree/bindings/ata/fsl,ahci.yaml
>>>> +++ b/Documentation/devicetree/bindings/ata/fsl,ahci.yaml
>>>> @@ -11,13 +11,18 @@ maintainers:
>>>>  
>>>>  properties:
>>>>    compatible:
>>>> -    enum:
>>>> -      - fsl,ls1021a-ahci
>>>> -      - fsl,ls1043a-ahci
>>>> -      - fsl,ls1028a-ahci
>>>> -      - fsl,ls1088a-ahci
>>>> -      - fsl,ls2080a-ahci
>>>> -      - fsl,lx2160a-ahci
>>>> +    oneOf:
>>>> +      - items:
>>>> +          - const: fsl,ls1012a-ahci
>>>> +          - const: fsl,ls1043a-ahci
>>>> +      - enum:
>>>> +          - fsl,ls1021a-ahci
>>>> +          - fsl,ls1043a-ahci
>>>> +          - fsl,ls1046a-ahci
>>>
>>> Where is the driver change for this?
>>>
>>> Your commit does not explain why you are doing it and without driver
>>> change adding new support it is not obvious. This probably applies to
>>> all your patches.
>>
>> I think I missed ls1012a and ls1021a.  Commit message is wrong. This is
>> for legancy platorm. 
>>
>> Basic try to eliminate the CHECK_DTBS warning. ls1012a use
>>
>> "fsl,ls1012a-ahci", "fsl,ls1043a-ahci". There are two methods, 
>> 1. change binding doc to allow "fsl,ls1012a-ahci", "fsl,ls1043a-ahci"
> 
> But then shouldn't you also change the drivers/ata/ahci_qoriq.c to add ls1012a
> as a compatible ?

The fallback will be used by the driver, so there is no need to add
front compatibles to of_device_id table.

> 
>> 2. remove "fsl,ls1012a-ahci".
> 
> I am not sure if that is acceptable since there is one device tree using it out
> there already.
> 
> I am no DT expert, but I think (1) with the driver change is the right approach.
> Krzysztof ?

Yep, this cannot be removed.

Best regards,
Krzysztof