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Date:   Mon, 24 Apr 2023 11:15:58 -0500
From:   Rob Herring <robh@kernel.org>
To:     Nikita Shubin <nikita.shubin@maquefel.me>
Cc:     Arnd Bergmann <arnd@kernel.org>, Linus Walleij <linusw@kernel.org>,
        Alexander Sverdlin <alexander.sverdlin@gmail.com>,
        Vinod Koul <vkoul@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        dmaengine@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 20/43] dt-bindings: dma: Add DT bindings ep93xx dma
Message-ID: <20230424161558.GF2701399-robh@kernel.org>
References: <20230424123522.18302-1-nikita.shubin@maquefel.me>
 <20230424123522.18302-21-nikita.shubin@maquefel.me>
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On Mon, Apr 24, 2023 at 03:34:36PM +0300, Nikita Shubin wrote:
> Add YAML bindings for ep93xx SoC.
> 
> Signed-off-by: Nikita Shubin <nikita.shubin@maquefel.me>
> ---
>  .../bindings/dma/cirrus,ep93xx-dma-m2m.yaml   |  66 ++++++++++++
>  .../bindings/dma/cirrus,ep93xx-dma-m2p.yaml   | 102 ++++++++++++++++++
>  2 files changed, 168 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/dma/cirrus,ep93xx-dma-m2m.yaml
>  create mode 100644 Documentation/devicetree/bindings/dma/cirrus,ep93xx-dma-m2p.yaml
> 
> diff --git a/Documentation/devicetree/bindings/dma/cirrus,ep93xx-dma-m2m.yaml b/Documentation/devicetree/bindings/dma/cirrus,ep93xx-dma-m2m.yaml
> new file mode 100644
> index 000000000000..9a53ee9052a0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/cirrus,ep93xx-dma-m2m.yaml
> @@ -0,0 +1,66 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/dma/cirrus,ep93xx-dma-m2m.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Cirrus Logick ep93xx SoC DMA controller Device Tree Bindings
> +
> +maintainers:
> +  - Vinod Koul <vkoul@kernel.org>

Again, wrong person.

> +
> +properties:
> +  compatible:
> +    items:
> +      - const: cirrus,ep9301-dma-m2m

'items' can be dropped.

> +
> +  reg:
> +    minItems: 2
> +    maxItems: 2

Need to define what each entry is.

> +
> +  clocks:
> +    items:
> +      - description: m2m0 channel gate clock
> +      - description: m2m1 channel gate clock
> +
> +  clock-names:
> +    items:
> +      - const: m2m0
> +      - const: m2m1
> +
> +  interrupts:
> +    minItems: 2
> +    maxItems: 2

Need to define what each entry is.

> +
> +  dma-channels:
> +    minimum: 2
> +    maximum: 2

If the only possible number of channels is 2, why is this property 
needed?

> +
> +  '#dma-cells': false
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - interrupts
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/cirrus,ep93xx-clock.h>
> +    dma1: dma-controller@80000100 {
> +        compatible = "cirrus,ep9301-dma-m2m";
> +        reg = <0x80000100 0x0040>,
> +                <0x80000140 0x0040>;
> +        clocks = <&syscon EP93XX_CLK_M2M0>,
> +                <&syscon EP93XX_CLK_M2M1>;
> +        clock-names = "m2m0", "m2m1";
> +        dma-channels = <2>;
> +        interrupt-parent = <&vic0>;
> +        interrupts = <17>, <18>;
> +    };
> +
> +...
> +
> diff --git a/Documentation/devicetree/bindings/dma/cirrus,ep93xx-dma-m2p.yaml b/Documentation/devicetree/bindings/dma/cirrus,ep93xx-dma-m2p.yaml
> new file mode 100644
> index 000000000000..51fd72b4e843
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/cirrus,ep93xx-dma-m2p.yaml
> @@ -0,0 +1,102 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/dma/cirrus,ep93xx-dma-m2p.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Cirrus Logick ep93xx SoC M2P DMA controller Device Tree Bindings
> +
> +maintainers:
> +  - Vinod Koul <vkoul@kernel.org>
> +
> +properties:
> +  compatible:
> +    items:
> +      - const: cirrus,ep9301-dma-m2p
> +
> +  reg:
> +    minItems: 10
> +    maxItems: 10

Define each entry. Looks like it's just N entries for N channels. Just a 
description with that is enough.

> +
> +  clocks:
> +    items:
> +      - description: m2p0 channel gate clock
> +      - description: m2p1 channel gate clock
> +      - description: m2p2 channel gate clock
> +      - description: m2p3 channel gate clock
> +      - description: m2p4 channel gate clock
> +      - description: m2p5 channel gate clock
> +      - description: m2p6 channel gate clock
> +      - description: m2p7 channel gate clock
> +      - description: m2p8 channel gate clock
> +      - description: m2p9 channel gate clock
> +
> +  clock-names:
> +    items:
> +      - const: m2p0
> +      - const: m2p1
> +      - const: m2p2
> +      - const: m2p3
> +      - const: m2p4
> +      - const: m2p5
> +      - const: m2p6
> +      - const: m2p7
> +      - const: m2p8
> +      - const: m2p9
> +
> +  interrupts:
> +    minItems: 10
> +    maxItems: 10
> +
> +  dma-channels:
> +    minimum: 10
> +    maximum: 10
> +
> +  '#dma-cells': false
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - interrupts
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/cirrus,ep93xx-clock.h>
> +    dma0: dma-controller@80000000 {
> +        compatible = "cirrus,ep9301-dma-m2p";
> +        reg =   <0x80000000 0x0040>,
> +                <0x80000040 0x0040>,
> +                <0x80000080 0x0040>,
> +                <0x800000c0 0x0040>,
> +                <0x80000240 0x0040>,
> +                <0x80000200 0x0040>,
> +                <0x800002c0 0x0040>,
> +                <0x80000280 0x0040>,
> +                <0x80000340 0x0040>,
> +                <0x80000300 0x0040>;
> +        clocks = <&syscon EP93XX_CLK_M2P0>,
> +                <&syscon EP93XX_CLK_M2P1>,
> +                <&syscon EP93XX_CLK_M2P2>,
> +                <&syscon EP93XX_CLK_M2P3>,
> +                <&syscon EP93XX_CLK_M2P4>,
> +                <&syscon EP93XX_CLK_M2P5>,
> +                <&syscon EP93XX_CLK_M2P6>,
> +                <&syscon EP93XX_CLK_M2P7>,
> +                <&syscon EP93XX_CLK_M2P8>,
> +                <&syscon EP93XX_CLK_M2P9>;
> +        clock-names = "m2p0", "m2p1",
> +                "m2p2", "m2p3",
> +                "m2p4", "m2p5",
> +                "m2p6", "m2p7",
> +                "m2p8", "m2p9";
> +        dma-channels = <10>;
> +        interrupt-parent = <&vic0>;
> +        interrupts = <7>, <8>, <9>, <10>, <11>, <12>, <13>, <14>, <15>, <16>;
> +    };
> +
> +...
> +
> -- 
> 2.39.2
>