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 20:02:29 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Md Sadre Alam <quic_mdalam@...cinc.com>, 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
Cc: quic_srichara@...cinc.com, quic_varada@...cinc.com
Subject: Re: [PATCH 1/5] spi: dt-bindings: add binding doc for spi-qpic-snand

On 15/02/2024 14:48, Md Sadre Alam wrote:
> Add device-tree binding documentation for QCOM QPIC-SNAND-NAND Flash
> Interface.
> 

A nit, subject: drop second/last, redundant "bindings". The
"dt-bindings" prefix is already stating that these are bindings.
See also:
https://elixir.bootlin.com/linux/v6.7-rc8/source/Documentation/devicetree/bindings/submitting-patches.rst#L18

> 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

Filename like compatible.

> @@ -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>
> +

Provide description which will describe hardware.

> +properties:
> +  compatible:
> +    enum:
> +      - qcom,ipq9574-snand
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    minItems: 2
> +    maxItems: 3

You must document the items (could be sufficient in clock-names if the
names are obvious).


Why the clocks are flexible? This given IPQ9574 has variable clock
inputs? Please explain.

> +
> +  clock-names:
> +    minItems: 2
> +    maxItems: 3
> +

required goes here.

> +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

No clue why it is here, move it to top level.

> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/qcom,ipq9574-gcc.h>
> +    qpic_nand: spi@...0000 {

Drop unused label

> +        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>;
> +            };

Fix indentation.

> +        };

Best regards,
Krzysztof