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Message-ID: <AM6PR04MB605309F95A4BBD29DFA42B61E2E20@AM6PR04MB6053.eurprd04.prod.outlook.com>
Date: Tue, 17 Nov 2020 07:10:28 +0000
From: Alice Guo <alice.guo@....com>
To: Krzysztof Kozlowski <krzk@...nel.org>
CC: "robh+dt@...nel.org" <robh+dt@...nel.org>,
"shawnguo@...nel.org" <shawnguo@...nel.org>,
"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
dl-linux-imx <linux-imx@....com>, Peng Fan <peng.fan@....com>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [EXT] Re: [PATCH v3 1/4] dt-bindings: soc: imx8m: add DT Binding
doc for soc unique ID
> -----Original Message-----
> From: Krzysztof Kozlowski <krzk@...nel.org>
> Sent: 2020年11月17日 0:03
> To: Alice Guo <alice.guo@....com>
> Cc: robh+dt@...nel.org; shawnguo@...nel.org; s.hauer@...gutronix.de;
> dl-linux-imx <linux-imx@....com>; Peng Fan <peng.fan@....com>;
> devicetree@...r.kernel.org; linux-kernel@...r.kernel.org;
> linux-arm-kernel@...ts.infradead.org
> Subject: Re: [EXT] Re: [PATCH v3 1/4] dt-bindings: soc: imx8m: add DT Binding
> doc for soc unique ID
>
> Caution: EXT Email
>
> On Mon, Nov 16, 2020 at 07:04:13AM +0000, Alice Guo wrote:
> >
> > > -----Original Message-----
> > > From: Krzysztof Kozlowski <krzk@...nel.org>
> > > Sent: 2020年11月15日 0:50
> > > To: Alice Guo <alice.guo@....com>
> > > Cc: robh+dt@...nel.org; shawnguo@...nel.org; s.hauer@...gutronix.de;
> > > dl-linux-imx <linux-imx@....com>; Peng Fan <peng.fan@....com>;
> > > devicetree@...r.kernel.org; linux-kernel@...r.kernel.org;
> > > linux-arm-kernel@...ts.infradead.org
> > > Subject: [EXT] Re: [PATCH v3 1/4] dt-bindings: soc: imx8m: add DT
> > > Binding doc for soc unique ID
> > >
> > > Caution: EXT Email
> > >
> > > On Fri, Nov 13, 2020 at 07:04:06PM +0800, Alice Guo wrote:
> > > > Add DT Binding doc for the Unique ID of i.MX 8M series.
> > > >
> > > > Signed-off-by: Alice Guo <alice.guo@....com>
> > > > ---
> > > > .../devicetree/bindings/arm/fsl.yaml | 25
> > > +++++++++++++++++++
> > > > 1 file changed, 25 insertions(+)
> > > >
> > > > diff --git a/Documentation/devicetree/bindings/arm/fsl.yaml
> > > > b/Documentation/devicetree/bindings/arm/fsl.yaml
> > > > index e4db0f9ed664..f4faebbb57da 100644
> > > > --- a/Documentation/devicetree/bindings/arm/fsl.yaml
> > > > +++ b/Documentation/devicetree/bindings/arm/fsl.yaml
> > > > @@ -901,6 +901,31 @@ properties:
> > > > - fsl,s32v234-evb # S32V234-EVB2
> Customer
> > > Evaluation Board
> > > > - const: fsl,s32v234
> > > >
> > > > + soc:
> > > > + type: object
> > > > + properties:
> > > > + compatible:
> > > > + oneOf:
> > > > + - description: i.MX8M SoCs
> > > > + items:
> > > > + - enum:
> > > > + - fsl,imx8mm-soc
> > > > + - fsl,imx8mn-soc
> > > > + - fsl,imx8mp-soc
> > > > + - fsl,imx8mq-soc
> > > > + - const: simple-bus
> > > > +
> > > > + - description: Other SoCs
> > > > + items:
> > > > + - const: simple-bus
> > > > +
> > > > + nvmem-cells:
> > > > + maxItems: 1
> > > > + description: Phandle to the SOC Unique ID provided by a
> > > > + nvmem node
> > > > +
> > > > + nvmem-cells-names:
> > > > + const: soc_unique_id
> > > > +
> > > > additionalProperties: true
> > >
> > > The "soc" node should be required for these compatibles. Otherwise
> > > you will have to stay with this
> > > backwards-compatible-DTB-device-initcall-glue for many years... I think you
> can achieve it with allOf.
> > >
> > [Alice Guo]Hi,
> > I find that my description for compatible is ambiguous. There are two kinds of
> compatible of the "soc" node:
> > 1. For dtsi files used for SoCs other than imx8m series SoCs and old
> > version dtsi files used for imx8m series SoCs, compatible of the "soc" node is
> "simple-bus".
> > 2. For new version dtsi files used for imx8m series SoCs, compatible of the
> "soc" node is {"fsl,imx8mX-soc","simple-bus"}.
> >
> > "nvmem-cell" is an optional property.
> >
> > I do not understand what you mean. You mean that limit the compatible of
> "soc" node must include " fsl,imx8mX-soc" in new version dts files. Is my
> understanding correct?
>
> All new DTS files should have soc node with "fsl,imx8mX-soc" and this should be
> required by dtschema. The nvmem-cells and related properties do not look like
> optional. From the hardware perspective - they are always present. From the
> driver point of view: they are required and driver will fail to work.
[Alice Guo]
+ soc:
+ type: object
+ properties:
+ compatible:
+ oneOf:
+ - description: new version DTS for i.MX8M SoCs
+ items:
+ - enum:
+ - fsl,imx8mm-soc
+ - fsl,imx8mn-soc
+ - fsl,imx8mp-soc
+ - fsl,imx8mq-soc
+ - const: simple-bus
+
+ - description: other SoCs and old version DTS for i.MX8M SoCs
+ items:
+ - const: simple-bus
+
+ nvmem-cells:
+ maxItems: 1
+ description: Phandle to the SOC Unique ID provided by a nvmem node
+
+ nvmem-cells-names:
+ const: soc_unique_id
+
+ allOf:
+ - if:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - fsl,imx8mm-soc
+ - fsl,imx8mn-soc
+ - fsl,imx8mp-soc
+ - fsl,imx8mq-soc
+ const: simple-bus
+
+ then:
+ required:
+ - nvmem-cells
+ - nvmem-cells-names
The above is my modification. Is that ok?
Best regards,
Alice
> Best regards,
> Krzysztof
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