linux-kernel - RE: [EXT] Re: [PATCH v8 05/10] dt-bindings: usb: ci-hdrc-usb2-imx: add restrictions for reg, interrupts, clock and clock-names properties

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Date: Wed, 13 Mar 2024 03:26:29 +0000
From: Xu Yang <xu.yang_2@....com>
To: Frank Li <frank.li@....com>
CC: Rob Herring <robh@...nel.org>, "gregkh@...uxfoundation.org"
	<gregkh@...uxfoundation.org>, "krzysztof.kozlowski+dt@...aro.org"
	<krzysztof.kozlowski+dt@...aro.org>, "shawnguo@...nel.org"
	<shawnguo@...nel.org>, "conor+dt@...nel.org" <conor+dt@...nel.org>,
	"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>, "kernel@...gutronix.de"
	<kernel@...gutronix.de>, "festevam@...il.com" <festevam@...il.com>,
	dl-linux-imx <linux-imx@....com>, "peter.chen@...nel.org"
	<peter.chen@...nel.org>, Jun Li <jun.li@....com>, "linux-usb@...r.kernel.org"
	<linux-usb@...r.kernel.org>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "imx@...ts.linux.dev"
	<imx@...ts.linux.dev>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [EXT] Re: [PATCH v8 05/10] dt-bindings: usb: ci-hdrc-usb2-imx:
 add restrictions for reg, interrupts, clock and clock-names properties


> 
> On Wed, Mar 13, 2024 at 02:48:00AM +0000, Xu Yang wrote:
> >
> > >
> > > On Tue, Mar 12, 2024 at 05:16:58PM +0800, Xu Yang wrote:
> > > > Add restrictions for reg, interrupts, clock and clock-names properties
> > > > for imx Socs.
> > > >
> > > > Signed-off-by: Xu Yang <xu.yang_2@....com>
> > > >
> > > > ---
> > > > Changes in v4:
> > > >  - new patch since v3's discussion
> > > >  - split the reg, interrupts, clock and clock-names properties into
> > > >    common part and device-specific
> > > > Changes in v5:
> > > >  - keep common property unchanged
> > > >  - make if-then more readable
> > > >  - remove non imx part
> > > > Changes in v6:
> > > >  - new patch based on ci-hdrc-usb2-imx.yaml
> > > > Changes in v7:
> > > >  - no changes
> > > > Changes in v8:
> > > >  - remove if:else:if:else:if:else block
> > > > ---
> > > >  .../bindings/usb/chipidea,usb2-imx.yaml       | 80 +++++++++++++++++++
> > > >  1 file changed, 80 insertions(+)
> > > >
> > > > diff --git a/Documentation/devicetree/bindings/usb/chipidea,usb2-imx.yaml
> > > b/Documentation/devicetree/bindings/usb/chipidea,usb2-imx.yaml
> > > > index cdbb224e9f68..fb1c378dfe88 100644
> > > > --- a/Documentation/devicetree/bindings/usb/chipidea,usb2-imx.yaml
> > > > +++ b/Documentation/devicetree/bindings/usb/chipidea,usb2-imx.yaml
> > > > @@ -49,6 +49,12 @@ properties:
> > > >            - const: fsl,imx6ul-usb
> > > >            - const: fsl,imx27-usb
> > > >
> > > > +  reg:
> > > > +    maxItems: 1
> > > > +
> > > > +  interrupts:
> > > > +    maxItems: 1
> > > > +
> > > >    clocks:
> > > >      minItems: 1
> > > >      maxItems: 3
> > > > @@ -144,6 +150,80 @@ allOf:
> > > >              - const: idle
> > > >              - const: active
> > > >
> > > > +  # imx27 Soc needs three clocks
> > > > +  - if:
> > > > +      properties:
> > > > +        compatible:
> > > > +          const: fsl,imx27-usb
> > > > +    then:
> > > > +      properties:
> > > > +        clocks:
> > > > +          minItems: 3
> > > > +          maxItems: 3
> > >
> > > The max is already 3, so drop maxItems.
> >
> > Okay.
> >
> > >
> > > > +        clock-names:
> > > > +          items:
> > > > +            - const: ipg
> > > > +            - const: ahb
> > > > +            - const: per
> > > > +
> > > > +  # imx25 and imx35 Soc need three clocks
> > > > +  - if:
> > > > +      properties:
> > > > +        compatible:
> > > > +          contains:
> > > > +            enum:
> > > > +              - fsl,imx25-usb
> > > > +              - fsl,imx35-usb
> > > > +    then:
> > > > +      properties:
> > > > +        clocks:
> > > > +          minItems: 3
> > > > +          maxItems: 3
> > >
> > > Same here.
> >
> > Okay.
> >
> > >
> > > > +        clock-names:
> > > > +          items:
> > > > +            - const: ipg
> > > > +            - const: ahb
> > > > +            - const: per
> > > > +
> > > > +  # imx7d Soc need one clock
> > > > +  - if:
> > > > +      properties:
> > > > +        compatible:
> > > > +          items:
> > > > +            - const: fsl,imx7d-usb
> > > > +            - const: fsl,imx27-usb
> > > > +    then:
> > > > +      properties:
> > > > +        clocks:
> > > > +          maxItems: 1
> > > > +        clock-names:
> > > > +          maxItems: 1
> > >
> > > What's the name?
> >
> > Can I not specify the name since the macro definition for USB
> > controller clock in clock.h is recognizable and the driver doesn't
> > get this clock by name rather index?
> 
> If clock-names is not required for fsl,imx7d-usb,
> 
> clock-names: false

Set it to false make sense to me.

> 
> If driver use index to get clock, why need clock-names at other platform?
> I supposed these should be the same for all chips.

Yes, they are same. I add clock-names because some dts already have
clock-names in the usb node. 
If I set it to false, I should remove clock-names from these platforms in
next version.

Thanks,
Xu Yang