linux-kernel - Re: [PATCH 1/6] dt-bindings: perf: fsl-imx-ddr: Add compatible string for i.MX8QM, i.MX8QXP and i.MX8DXL

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Message-ID: <71fd8843-0a41-40b3-9cbe-dc3f7f77260d@kernel.org>
Date: Fri, 24 Oct 2025 17:50:45 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Frank Li <Frank.li@....com>
Cc: Xu Yang <xu.yang_2@....com>, Will Deacon <will@...nel.org>,
 Mark Rutland <mark.rutland@....com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
 Sascha Hauer <s.hauer@...gutronix.de>,
 Pengutronix Kernel Team <kernel@...gutronix.de>,
 Fabio Estevam <festevam@...il.com>, linux-arm-kernel@...ts.infradead.org,
 linux-perf-users@...r.kernel.org, devicetree@...r.kernel.org,
 imx@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] dt-bindings: perf: fsl-imx-ddr: Add compatible string
 for i.MX8QM, i.MX8QXP and i.MX8DXL

On 24/10/2025 15:19, Frank Li wrote:
> On Fri, Oct 24, 2025 at 03:03:10PM +0200, Krzysztof Kozlowski wrote:
>> On 23/10/2025 20:56, Frank Li wrote:
>>> Add compatible string fsl,imx8qm-ddr-pmu, fsl,imx8qxp-ddr-pmu and
>>> fsl,imx8dxl-db-pmu (for data bus fabric).
>>>
>>> Add clocks and clock-names for fsl,imx8dxl-db-pmu and keep the same
>>> restriction for existing compatible strings.
>>>
>>> Signed-off-by: Frank Li <Frank.Li@....com>
>>> ---
>>>  .../devicetree/bindings/perf/fsl-imx-ddr.yaml      | 26 ++++++++++++++++++++++
>>>  1 file changed, 26 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/perf/fsl-imx-ddr.yaml b/Documentation/devicetree/bindings/perf/fsl-imx-ddr.yaml
>>> index d2e578d6b83b8847c7a0ca9d5aeb208a90e2fa6a..13eb13a79e2100ae1d747ddf6fc4db5b470112a8 100644
>>> --- a/Documentation/devicetree/bindings/perf/fsl-imx-ddr.yaml
>>> +++ b/Documentation/devicetree/bindings/perf/fsl-imx-ddr.yaml
>>> @@ -14,6 +14,7 @@ properties:
>>>      oneOf:
>>>        - enum:
>>>            - fsl,imx8-ddr-pmu
>>> +          - fsl,imx8dxl-db-pmu
>>>            - fsl,imx8m-ddr-pmu
>>>            - fsl,imx8mq-ddr-pmu
>>>            - fsl,imx8mm-ddr-pmu
>>> @@ -29,6 +30,8 @@ properties:
>>>            - const: fsl,imx8m-ddr-pmu
>>>        - items:
>>>            - const: fsl,imx8dxl-ddr-pmu
>>> +          - const: fsl,imx8qm-ddr-pmu
>>> +          - const: fsl,imx8qxp-ddr-pmu
>>
>>
>> I don't understand the need for this change, not explained in commit
>> msg. Why do you change 8dxl-ddr?
> 
> I have not change 8dxl-ddr, but add fsl,imx8dxl-db-pmu, which is difference


I talk about this exact hunk. You clearly have list for imx8dxl-ddr-pmu
being modified.

> with fsl,imx8dxl-ddr-pmu. (db vs ddr). db have less events compared to
> ddr's pmu.
> 
> Frank
> 
>>
>> Best regards,
>> Krzysztof


Best regards,
Krzysztof