linux-kernel - Re: [PATCH] dt-bindings: dma: fsl,imx-dma: Convert to dtschema

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Message-ID: <CAE3Oz80GUu_aojCqz3DAZEJx=Yo-4mYL-xtdtuN+F_BBeJ3smg@mail.gmail.com>
Date: Fri, 31 May 2024 14:05:39 +0530
From: Animesh Agarwal <animeshagarwal28@...il.com>
To: Frank Li <Frank.li@....com>
Cc: Vinod Koul <vkoul@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, 
	Pengutronix Kernel Team <kernel@...gutronix.de>, Fabio Estevam <festevam@...il.com>, dmaengine@...r.kernel.org, 
	devicetree@...r.kernel.org, imx@...ts.linux.dev, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: dma: fsl,imx-dma: Convert to dtschema

On Thu, May 30, 2024 at 9:36 PM Frank Li <Frank.li@....com> wrote:
>
> On Thu, May 30, 2024 at 12:51:07PM +0530, Animesh Agarwal wrote:
> > Convert the fsl i.MX DMA controller bindings to DT schema
>
> nit: need "." after sentence.

Sorry for the typo here.

> >
> > Signed-off-by: Animesh Agarwal <animeshagarwal28@...il.com>
> > ---
> >  .../devicetree/bindings/dma/fsl,imx-dma.yaml  | 58 +++++++++++++++++++
> >  .../devicetree/bindings/dma/fsl-imx-dma.txt   | 50 ----------------
> >  2 files changed, 58 insertions(+), 50 deletions(-)
> >  create mode 100644 Documentation/devicetree/bindings/dma/fsl,imx-dma.yaml
> >  delete mode 100644 Documentation/devicetree/bindings/dma/fsl-imx-dma.txt
> >
> > diff --git a/Documentation/devicetree/bindings/dma/fsl,imx-dma.yaml b/Documentation/devicetree/bindings/dma/fsl,imx-dma.yaml
> > new file mode 100644
> > index 000000000000..f36ab5425bdb
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/dma/fsl,imx-dma.yaml
> > @@ -0,0 +1,58 @@
> > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/dma/fsl,imx-dma.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Freescale Direct Memory Access (DMA) Controller for i.MX
> > +
> > +maintainers:
> > +  - Animesh Agarwal <animeshagarwal28@...il.com>
> > +
> > +allOf:
> > +  - $ref: dma-controller.yaml#
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - fsl,imx1-dma
> > +      - fsl,imx21-dma
> > +      - fsl,imx27-dma
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  interrupts:
> > +    description: |
> > +      First item should be DMA interrupt, second one is optional and
> > +      should contain DMA Error interrupt.
>
> items:
>   - description: DMA complete interrupt
>   - description: DMA Error interrupt

I'll add this in v2.
>
> > +    minItems: 1
> > +    maxItems: 2
> > +
> > +  "#dma-cells":
> > +    const: 1
> > +
> > +  dma-channels:
> > +    const: 16
>
> I think it should be maximum: 16

Agreed! Changing it for v2.

>
> > +
> > +  dma-requests:
> > +    description: |
> > +      Number of DMA requests supported.
>
> No "|" need here.

Removing this.

>
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - interrupts
> > +  - "#dma-cells"
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    dma: dma-controller@...01000 {
>
> needn't label "dma".

Removing this.

>
> > +      compatible = "fsl,imx27-dma";
> > +      reg = <0x10001000 0x1000>;
> > +      interrupts = <32 33>;
> > +      #dma-cells = <1>;
> > +      dma-channels = <16>;
> > +    };
> > diff --git a/Documentation/devicetree/bindings/dma/fsl-imx-dma.txt b/Documentation/devicetree/bindings/dma/fsl-imx-dma.txt
> > deleted file mode 100644
> > index 1c9929d53727..000000000000
> > --- a/Documentation/devicetree/bindings/dma/fsl-imx-dma.txt
> > +++ /dev/null
> > @@ -1,50 +0,0 @@
> > -* Freescale Direct Memory Access (DMA) Controller for i.MX
> > -
> > -This document will only describe differences to the generic DMA Controller and
> > -DMA request bindings as described in dma/dma.txt .
> > -
> > -* DMA controller
> > -
> > -Required properties:
> > -- compatible : Should be "fsl,<chip>-dma". chip can be imx1, imx21 or imx27
> > -- reg : Should contain DMA registers location and length
> > -- interrupts : First item should be DMA interrupt, second one is optional and
> > -    should contain DMA Error interrupt
> > -- #dma-cells : Has to be 1. imx-dma does not support anything else.
> > -
> > -Optional properties:
> > -- dma-channels : Number of DMA channels supported. Should be 16.
> > -- #dma-channels : deprecated
> > -- dma-requests : Number of DMA requests supported.
> > -- #dma-requests : deprecated
> > -
> > -Example:
> > -
> > -     dma: dma@...01000 {
> > -             compatible = "fsl,imx27-dma";
> > -             reg = <0x10001000 0x1000>;
> > -             interrupts = <32 33>;
> > -             #dma-cells = <1>;
> > -             dma-channels = <16>;
> > -     };
> > -
> > -
> > -* DMA client
> > -
> > -Clients have to specify the DMA requests with phandles in a list.
> > -
> > -Required properties:
> > -- dmas: List of one or more DMA request specifiers. One DMA request specifier
> > -    consists of a phandle to the DMA controller followed by the integer
> > -    specifying the request line.
> > -- dma-names: List of string identifiers for the DMA requests. For the correct
> > -    names, have a look at the specific client driver.
> > -
> > -Example:
> > -
> > -     sdhci1: sdhci@...13000 {
> > -             ...
> > -             dmas = <&dma 7>;
> > -             dma-names = "rx-tx";
> > -             ...
> > -     };
> > --
> > 2.45.1
> >