linux-kernel - Re: [PATCH 1/2] dt-bindings: ufs: ti,j721e-ufs.yaml: Add binding for TI UFS wrapper

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Date:   Thu, 3 Oct 2019 16:56:31 -0500
From:   Rob Herring <robh@...nel.org>
To:     Vignesh Raghavendra <vigneshr@...com>
Cc:     Mark Rutland <mark.rutland@....com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Martin K Petersen <martin.petersen@...cle.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Pedro Sousa <pedrom.sousa@...opsys.com>,
        Janek Kotas <jank@...ence.com>, devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        SCSI <linux-scsi@...r.kernel.org>, Sekhar Nori <nsekhar@...com>
Subject: Re: [PATCH 1/2] dt-bindings: ufs: ti,j721e-ufs.yaml: Add binding for
 TI UFS wrapper

On Tue, Oct 1, 2019 at 7:18 AM Vignesh Raghavendra <vigneshr@...com> wrote:
>
>
>
> On 01/10/19 5:38 PM, Rob Herring wrote:
> > On Wed, Sep 18, 2019 at 07:09:20PM +0530, Vignesh Raghavendra wrote:
> >> Add binding documentation of TI wrapper for Cadence UFS Controller.
> >>
> >> Signed-off-by: Vignesh Raghavendra <vigneshr@...com>
> >> ---
> >>  .../devicetree/bindings/ufs/ti,j721e-ufs.yaml | 45 +++++++++++++++++++
> >>  1 file changed, 45 insertions(+)
> >>  create mode 100644 Documentation/devicetree/bindings/ufs/ti,j721e-ufs.yaml
> >>
> >> diff --git a/Documentation/devicetree/bindings/ufs/ti,j721e-ufs.yaml b/Documentation/devicetree/bindings/ufs/ti,j721e-ufs.yaml
> >> new file mode 100644
> >> index 000000000000..dabd7c795fbe
> >> --- /dev/null
> >> +++ b/Documentation/devicetree/bindings/ufs/ti,j721e-ufs.yaml
> >> @@ -0,0 +1,45 @@
> >> +# SPDX-License-Identifier: GPL-2.0
> >> +%YAML 1.2
> >> +---
> >> +$id: http://devicetree.org/schemas/ufs/ti,j721e-ufs.yaml#
> >> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> >> +
> >> +title: TI J721e UFS Host Controller Glue Driver
> >> +
> >> +maintainers:
> >> +  - Vignesh Raghavendra <vigneshr@...com>
> >> +
> >> +properties:
> >> +  compatible:
> >> +    items:
> >> +      - const: ti,j721e-ufs
> >> +
> >> +  reg:
> >> +    maxItems: 1
> >> +    description: address of TI UFS glue registers
> >> +
> >> +  clocks:
> >> +    maxItems: 1
> >> +    description: phandle to the M-PHY clock
> >> +
> >> +  power-domains:
> >> +    maxItems: 1
> >> +
> >> +required:
> >> +  - compatible
> >> +  - reg
> >> +  - clocks
> >> +  - power-domains
> >> +
> >> +examples:
> >> +  - |
> >> +    ufs_wrapper: ufs-wrapper@...0000 {
> >> +       compatible = "ti,j721e-ufs";
> >> +       reg = <0x0 0x4e80000 0x0 0x100>;
> >> +       power-domains = <&k3_pds 277>;
> >> +       clocks = <&k3_clks 277 1>;
> >> +       assigned-clocks = <&k3_clks 277 1>;
> >> +       assigned-clock-parents = <&k3_clks 277 4>;
> >> +       #address-cells = <2>;
> >> +       #size-cells = <2>;
> >
> > Based on the driver you expect to have a child node here with the UFS
> > controller? You need to show that and have a schema for it.
> >
>
> Yes, Cadence UFS controller node will be the child node. Its bindings
> are documented at: Documentation/devicetree/bindings/ufs/cdns,ufshc.txt
> (which in turn refers to
> Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt)
>
> But they are not in .yaml yet. How would you suggest to reference that?
> Or should I just write plain text DT binding doc given that subsystem is
> not converted to yaml?

I guess for now just define the child node and refer to the text
document. Or feel free to convert the above 2 docs to schema. :)

Rob