> -----Original Message-----
> From: Krzysztof Kozlowski <krzk@xxxxxxxxxx>
> Sent: 2020年11月17日 15:36
> To: Alice Guo <alice.guo@xxxxxxx>
> Cc: robh+dt@xxxxxxxxxx; shawnguo@xxxxxxxxxx; s.hauer@xxxxxxxxxxxxxx;
> dl-linux-imx <linux-imx@xxxxxxx>; Peng Fan <peng.fan@xxxxxxx>;
> devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [EXT] Re: [PATCH v3 1/4] dt-bindings: soc: imx8m: add DT Binding
> doc for soc unique ID
>
> Caution: EXT Email
>
> On Tue, Nov 17, 2020 at 07:10:28AM +0000, Alice Guo wrote:
> >
> >
> > > -----Original Message-----
> > > From: Krzysztof Kozlowski <krzk@xxxxxxxxxx>
> > > Sent: 2020年11月17日 0:03
> > > To: Alice Guo <alice.guo@xxxxxxx>
> > > Cc: robh+dt@xxxxxxxxxx; shawnguo@xxxxxxxxxx; s.hauer@xxxxxxxxxxxxxx;
> > > dl-linux-imx <linux-imx@xxxxxxx>; Peng Fan <peng.fan@xxxxxxx>;
> > > devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> > > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> > > 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@xxxxxxxxxx>
> > > > > Sent: 2020年11月15日 0:50
> > > > > To: Alice Guo <alice.guo@xxxxxxx>
> > > > > Cc: robh+dt@xxxxxxxxxx; shawnguo@xxxxxxxxxx;
> > > > > s.hauer@xxxxxxxxxxxxxx; dl-linux-imx <linux-imx@xxxxxxx>; Peng
> > > > > Fan <peng.fan@xxxxxxx>; devicetree@xxxxxxxxxxxxxxx;
> > > > > linux-kernel@xxxxxxxxxxxxxxx;
> > > > > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> > > > > 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@xxxxxxx>
> > > > > > ---
> > > > > > .../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?
>
> Does not look like solving anything.
If restrict that the newly added DTS file must have "fsl,imx8mX-soc" attributes, it cannot pass make dtbs_check because
there are other DTS files which have soc node but are not used for i.mx8m family SoCs.
Best regards,
Alice Guo
> Best regards,
> Krzysztof
