linux-kernel - RE: [PATCH] arm64: dts: imx8mp: add ddr controller node to support EDAC on imx8mp

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Date:   Mon, 21 Mar 2022 06:18:21 +0000
From:   Sherry Sun <sherry.sun@....com>
To:     Krzysztof Kozlowski <krzk@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzk+dt@...nel.org" <krzk+dt@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>
CC:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>,
        Dinh Nguyen <dinguyen@...nel.org>
Subject: RE: [PATCH] arm64: dts: imx8mp: add ddr controller node to support
 EDAC on imx8mp

Hi Krzysztof,

> Subject: Re: [PATCH] arm64: dts: imx8mp: add ddr controller node to support
> EDAC on imx8mp
> 
> On 18/03/2022 12:35, Sherry Sun wrote:
> > i.MX8MP use synopsys V3.70a ddr controller IP, so add edac support for
> > i.MX8MP based on "snps,ddrc-3.80a" synopsys edac driver.
> >
> > Signed-off-by: Sherry Sun <sherry.sun@....com>
> > ---
> >  arch/arm64/boot/dts/freescale/imx8mp.dtsi | 6 ++++++
> >  1 file changed, 6 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > index 794d75173cf5..a6124a11d6ee 100644
> > --- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > +++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > @@ -902,6 +902,12 @@
> >  			interrupt-parent = <&gic>;
> >  		};
> >
> > +		edacmc: memory-controller@...00000 {
> > +			compatible = "snps,ddrc-3.80a";
> > +			reg = <0x3d400000 0x400000>;
> > +			interrupts = <GIC_SPI 147 IRQ_TYPE_LEVEL_HIGH>;
> 
> This is not correct according to the bindings. Dinh's commit adding the
> compatible might not be correct, so please first fix bindings.
> 
> While fixing bindings, order the compatibles by name (s goes before x).

I met some issues when run dt_binding_check and dtbs_check for the dt bindings.
So now I cannot observe the errors what you said in the bindings, but from the logic, I guess I may need to add below fix patch, right? Please correct me if I miss something here.

--- a/Documentation/devicetree/bindings/memory-controllers/synopsys,ddrc-ecc.yaml
+++ b/Documentation/devicetree/bindings/memory-controllers/synopsys,ddrc-ecc.yaml
@@ -24,9 +24,9 @@ description: |
 properties:
   compatible:
     enum:
+      - snps,ddrc-3.80a
       - xlnx,zynq-ddrc-a05
       - xlnx,zynqmp-ddrc-2.40a
-      - snps,ddrc-3.80a

   interrupts:
     maxItems: 1
@@ -43,7 +43,9 @@ allOf:
       properties:
         compatible:
           contains:
-            const: xlnx,zynqmp-ddrc-2.40a
+            enum:
+              - snps,ddrc-3.80a
+              - xlnx,zynqmp-ddrc-2.40a
     then:
       required:
         - interrupts

Best regards
Sherry

> 
> 
> Best regards,
> Krzysztof