linux-kernel - Re: [PATCH v2 3/8] dt-bindings: PCI: renesas-pci-usb: Allow multiple clocks

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Message-ID: <20220420150759.713fcd02@bootlin.com>
Date:   Wed, 20 Apr 2022 15:07:59 +0200
From:   Herve Codina <herve.codina@...tlin.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Marek Vasut <marek.vasut+renesas@...il.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Clement Leger <clement.leger@...tlin.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Subject: Re: [PATCH v2 3/8] dt-bindings: PCI: renesas-pci-usb: Allow
 multiple clocks

Hi Geert, Rob,

On Thu, 14 Apr 2022 10:35:07 +0200
Geert Uytterhoeven <geert@...ux-m68k.org> wrote:

> Hi Hervé,
> 
> On Thu, Apr 14, 2022 at 9:40 AM Herve Codina <herve.codina@...tlin.com> wrote:
> > Define that multiple clocks can be present at clocks property.
> >
> > Signed-off-by: Herve Codina <herve.codina@...tlin.com>  
> 
> Thanks for your patch!
> 
> > --- a/Documentation/devicetree/bindings/pci/renesas,pci-usb.yaml
> > +++ b/Documentation/devicetree/bindings/pci/renesas,pci-usb.yaml
> > @@ -54,7 +54,8 @@ properties:
> >        Standard property that helps to define the interrupt mapping.
> >
> >    clocks:
> > -    description: The reference to the device clock.
> > +    description:
> > +      The references to the device clocks (several clocks can be referenced).  
> 
> Please describe the clocks, and add the missing "clock-names" property.
> 
> >
> >    bus-range:
> >      description: |  
> 
> I think it would be better to combine this with [PATCH v2 4/8], as the
> additional clocks are only present on RZ/N1.
> 
> Then you can easily add json-schema logic to enforce the correct
> number of clocks, depending on the compatible value.

Sure.

Is there a way to have the clocks description depending on the compatible value.
I mean something like:
--- 8< ---
properties:
  clocks:
    maxItems: 1

if:
  properties:
    compatible:
      contains:
        enum:
          - renesas,pci-r9a06g032
          - renesas,pci-rzn1

then:
  properties:
    clocks:
      items:
        - description: Internal bus clock (AHB) for HOST
        - description: Internal bus clock (AHB) Power Management
        - description: PCI clock for USB subsystem
      minItems: 3
      maxItems: 3

else:
  properties:
    items:
       - description: Device clock
    clocks:
      minItems: 1
      maxItems: 1
--- 8< ---

In fact, I would like to describe the 3 clocks only for the r9a06g032 SOC
and the rzn1 family and have an other description for the other 'compatible'.

I cannot succeed to do it.

The only thing I can do is to leave the description of the 3 clocks out of the
conditional part. This leads to :

--- 8< ---
properties:
  clocks:
    items:
      - description: Internal bus clock (AHB) for HOST
      - description: Internal bus clock (AHB) Power Management
      - description: PCI clock for USB subsystem
    minItems: 1

if:
  properties:
    compatible:
      contains:
        enum:
          - renesas,pci-r9a06g032
          - renesas,pci-rzn1

then:
  properties:
    clocks:
      minItems: 3
      maxItems: 3

else:
  properties:
    clocks:
      minItems: 1
      maxItems: 1
--- 8< ---

Also the clock-names items can be different depending on the
compatible value.

Regards,
Hervé

-- 
Hervé Codina, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com