linux-kernel - Re: [PATCH v22 17/18] dt-bindings: mtd: pl353-nand: Describe this hardware controller

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Message-ID: <20210609153621.1303bc4d@xps13>
Date:   Wed, 9 Jun 2021 15:36:21 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Cc:     Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tudor Ambarus <Tudor.Ambarus@...rochip.com>,
        linux-mtd@...ts.infradead.org, Rob Herring <robh+dt@...nel.org>,
        devicetree@...r.kernel.org, Michal Simek <monstr@...str.eu>,
        Naga Sureshkumar Relli <nagasure@...inx.com>,
        Amit Kumar Mahapatra <akumarma@...inx.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        helmut.grohne@...enta.de, Srinivas Goud <sgoud@...inx.com>,
        Siva Durga Prasad Paladugu <sivadur@...inx.com>
Subject: Re: [PATCH v22 17/18] dt-bindings: mtd: pl353-nand: Describe this
 hardware controller

Hi Krzysztof,

Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com> wrote on Wed, 9
Jun 2021 14:01:10 +0200:

> On 09/06/2021 10:01, Miquel Raynal wrote:
> > Add a yaml description of this NAND controller which is described as a
> > subnode of the SMC bus.
> > 
> > Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> > ---
> >  .../bindings/mtd/arm,pl353-nand-r2p1.yaml     | 57 +++++++++++++++++++
> >  1 file changed, 57 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/mtd/arm,pl353-nand-r2p1.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/mtd/arm,pl353-nand-r2p1.yaml b/Documentation/devicetree/bindings/mtd/arm,pl353-nand-r2p1.yaml
> > new file mode 100644
> > index 000000000000..e72fa14b4385
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mtd/arm,pl353-nand-r2p1.yaml
> > @@ -0,0 +1,57 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/mtd/arm,pl353-nand-r2p1.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: PL353 NAND Controller device tree bindings
> > +
> > +allOf:
> > +  - $ref: "nand-controller.yaml"
> > +
> > +maintainers:
> > +  - Miquel Raynal <miquel.raynal@...tlin.com>
> > +  - Naga Sureshkumar Relli <naga.sureshkumar.relli@...inx.com>
> > +
> > +properties:
> > +  compatible:
> > +    items:
> > +      - enum:  
> 
> That's not an enum, but simple const without items.

Ok.

> 
> > +          - arm,pl353-nand-r2p1
> > +
> > +  reg:
> > +    items:
> > +      - items:
> > +          - description: CS with regard to the parent ranges property
> > +          - description: Offset of the memory region requested by the device
> > +          - description: Length of the memory region requested by the device  
> 
> Doesn't it depend on parent's address/size cells?

Yes, but as the child nodes are not defined in the parent's binding
(ie. the SMC) I think it's interesting to have them defined here, no?

> > +
> > +  "#address-cells": true
> > +  "#size-cells": true  
> 
> These should come from nand-controller.yaml

Right, I'll drop these, they are probably redundant.

Thanks,
Miquèl