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: <aPt8/exvRPlP0iNl@lizhi-Precision-Tower-5810>
Date: Fri, 24 Oct 2025 09:19:57 -0400
From: Frank Li <Frank.li@....com>
To: Krzysztof Kozlowski <krzk@...nel.org>
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 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
with fsl,imx8dxl-ddr-pmu. (db vs ddr). db have less events compared to
ddr's pmu.

Frank

>
> Best regards,
> Krzysztof