linux-kernel - Re: [PATCH 1/5] spi: dt-bindings: add binding doc for spi-qpic-snand

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Date: Thu, 15 Feb 2024 14:24:02 +0000
From: Conor Dooley <conor@...nel.org>
To: Md Sadre Alam <quic_mdalam@...cinc.com>
Cc: andersson@...nel.org, konrad.dybcio@...aro.org, broonie@...nel.org,
	robh@...nel.org, krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org, miquel.raynal@...tlin.com, richard@....at,
	vigneshr@...com, manivannan.sadhasivam@...aro.org,
	linux-arm-msm@...r.kernel.org, linux-spi@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mtd@...ts.infradead.org, quic_srichara@...cinc.com,
	quic_varada@...cinc.com
Subject: Re: [PATCH 1/5] spi: dt-bindings: add binding doc for spi-qpic-snand

On Thu, Feb 15, 2024 at 07:18:52PM +0530, Md Sadre Alam wrote:
> Add device-tree binding documentation for QCOM QPIC-SNAND-NAND Flash
> Interface.
> 
> Co-developed-by: Sricharan Ramabadhran <quic_srichara@...cinc.com>
> Signed-off-by: Sricharan Ramabadhran <quic_srichara@...cinc.com>
> Co-developed-by: Varadarajan Narayanan <quic_varada@...cinc.com>
> Signed-off-by: Varadarajan Narayanan <quic_varada@...cinc.com>
> Signed-off-by: Md Sadre Alam <quic_mdalam@...cinc.com>
> ---
>  .../bindings/spi/qcom,spi-qpic-snand.yaml     | 82 +++++++++++++++++++
>  1 file changed, 82 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/spi/qcom,spi-qpic-snand.yaml
> 
> diff --git a/Documentation/devicetree/bindings/spi/qcom,spi-qpic-snand.yaml b/Documentation/devicetree/bindings/spi/qcom,spi-qpic-snand.yaml
> new file mode 100644
> index 000000000000..fa7484ce1319
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/spi/qcom,spi-qpic-snand.yaml
> @@ -0,0 +1,82 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/spi/qcom,spi-qpic-snand.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm QPIC NAND controller
> +
> +maintainers:
> +  - Md sadre Alam <quic_mdalam@...cinc.com>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - qcom,ipq9574-snand
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    minItems: 2
> +    maxItems: 3
> +
> +  clock-names:
> +    minItems: 2
> +    maxItems: 3
> +
> +allOf:
> +  - $ref: /schemas/spi/spi-controller.yaml#
> +  - if:

> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - qcom,ipq9574-snand
> +
> +    then:
> +      properties:
> +        dmas:
> +          items:
> +            - description: tx DMA channel
> +            - description: rx DMA channel
> +            - description: cmd DMA channel
> +
> +        dma-names:
> +          items:
> +            - const: tx
> +            - const: rx
> +            - const: cmd

None of this complexity here is needed, you have only one device in this
binding and therefore can define these properties at the top level.

Cheers,
Conor.

> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/qcom,ipq9574-gcc.h>
> +    qpic_nand: spi@...0000 {
> +        compatible = "qcom,ipq9574-snand";
> +        reg = <0x1ac00000 0x800>;
> +
> +        clocks = <&gcc GCC_QPIC_CLK>,
> +                 <&gcc GCC_QPIC_AHB_CLK>,
> +                 <&gcc GCC_QPIC_IO_MACRO_CLK>;
> +        clock-names = "core", "aon", "iom";
> +
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        flash@0 {
> +            compatible = "spi-nand";
> +            reg = <0>;
> +            #address-cells = <1>;
> +            #size-cells = <1>;
> +            nand-ecc-engine = <&qpic_nand>;
> +            nand-ecc-strength = <4>;
> +            nand-ecc-step-size = <512>;
> +            };
> +        };
> -- 
> 2.34.1
> 

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