linux-kernel - Re: [PATCH v2 2/8] dt-bindings: PCI: renesas-pci-usb: Convert bindings to json-schema

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Date:   Wed, 20 Apr 2022 08:18:50 -0500
From:   Rob Herring <robh@...nel.org>
To:     Herve Codina <herve.codina@...tlin.com>
Cc:     Marek Vasut <marek.vasut+renesas@...il.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        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>,
        linux-pci@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        devicetree@...r.kernel.org, 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 2/8] dt-bindings: PCI: renesas-pci-usb: Convert
 bindings to json-schema

On Wed, Apr 20, 2022 at 02:44:11PM +0200, Herve Codina wrote:
> Hi Rob,
> 
> On Thu, 14 Apr 2022 13:15:30 -0500
> Rob Herring <robh@...nel.org> wrote:
> 
> > On Thu, Apr 14, 2022 at 09:40:05AM +0200, Herve Codina wrote:
> > > Convert Renesas PCI bridge bindings documentation to json-schema.
> > > Also name it 'renesas,pci-usb' as it is specifically used to
> > > connect the PCI USB controllers to AHB bus.  
> > 
> > Please name it based on compatible strings. renesas,pci-rcar-gen2.yaml
> 
> Ok, renamed.
> 
> > 
> > > 
> > > Signed-off-by: Herve Codina <herve.codina@...tlin.com>
> > > ---
> > >  .../devicetree/bindings/pci/pci-rcar-gen2.txt |  84 -----------
> > >  .../bindings/pci/renesas,pci-usb.yaml         | 134 ++++++++++++++++++
> > >  2 files changed, 134 insertions(+), 84 deletions(-)
> > >  delete mode 100644 Documentation/devicetree/bindings/pci/pci-rcar-gen2.txt
> > >  create mode 100644 Documentation/devicetree/bindings/pci/renesas,pci-usb.yaml
> > > 
> > > diff --git a/Documentation/devicetree/bindings/pci/pci-rcar-gen2.txt b/Documentation/devicetree/bindings/pci/pci-rcar-gen2.txt
> > > deleted file mode 100644
> ...
> > > diff --git a/Documentation/devicetree/bindings/pci/renesas,pci-usb.yaml b/Documentation/devicetree/bindings/pci/renesas,pci-usb.yaml
> > > new file mode 100644
> ...
> > > index 000000000000..3f8d79b746c7
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/pci/renesas,pci-usb.yaml
> > > @@ -0,0 +1,134 @@
> > > +# SPDX-License-Identifier: GPL-2.0
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/pci/renesas,pci-usb.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: Renesas AHB to PCI bridge
> > > +
> > > +maintainers:
> > > +  - Marek Vasut <marek.vasut+renesas@...il.com>
> > > +  - Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
> > > +
> > > +description: |
> > > +  This is the bridge used internally to connect the USB controllers to the
> > > +  AHB. There is one bridge instance per USB port connected to the internal
> > > +  OHCI and EHCI controllers.
> > > +
> > > +allOf:
> > > +  - $ref: /schemas/pci/pci-bus.yaml#
> > > +
> > > +properties:
> > > +  compatible:
> > > +    oneOf:
> > > +      - items:
> > > +          - enum:
> > > +              - renesas,pci-r8a7742      # RZ/G1H
> > > +              - renesas,pci-r8a7743      # RZ/G1M
> > > +              - renesas,pci-r8a7744      # RZ/G1N
> > > +              - renesas,pci-r8a7745      # RZ/G1E
> > > +              - renesas,pci-r8a7790      # R-Car H2
> > > +              - renesas,pci-r8a7791      # R-Car M2-W
> > > +              - renesas,pci-r8a7793      # R-Car M2-N
> > > +              - renesas,pci-r8a7794      # R-Car E2
> > > +          - const: renesas,pci-rcar-gen2 # R-Car Gen2 and RZ/G1
> > > +
> > > +  reg:
> > > +    description: |
> > > +      A list of physical regions to access the device. The first is
> > > +      the operational registers for the OHCI/EHCI controllers and the
> > > +      second is for the bridge configuration and control registers.
> > > +    minItems: 2
> > > +    maxItems: 2
> > > +
> > > +  interrupts:
> > > +    description: Interrupt for the device.
> > > +
> > > +  interrupt-map:
> > > +    description: |
> > > +      Standard property used to define the mapping of the PCI interrupts
> > > +      to the GIC interrupts.
> > > +
> > > +  interrupt-map-mask:
> > > +    description:
> > > +      Standard property that helps to define the interrupt mapping.
> > > +
> > > +  clocks:
> > > +    description: The reference to the device clock.
> > > +
> > > +  bus-range:
> > > +    description: |
> > > +      The PCI bus number range; as this is a single bus, the range
> > > +      should be specified as the same value twice.  
> > 
> > items:
> >   const: 0
> 
> Well, some other values are present in some dtsi files such as
> 'bus_range = <1 1>;' or 'bus_range = <2 2>;' in r8a7742.dtsi.
> 
> The constraint is to have the same value twice. Is there a way
> to specify this constraint ?

Yes, but probably not worthwhile. Just drop it as pci-bus.yaml already 
defines it.

> > > +
> > > +  "#address-cells":
> > > +    const: 3
> > > +
> > > +  "#size-cells":
> > > +    const: 2
> > > +
> > > +  "#interrupt-cells":
> > > +    const: 1  
> > 
> > All these are defined by pci-bus.yaml
> 
> Right.
> Replaced by:
> 
> "#address-cells": true
> "#size-cells": true
> "#interrupt-cells": true
> 
> Is that correct ?

You can just drop them completely.

Rob