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

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Message-ID: <196fe404-ad88-27da-9fd2-e717355be520@quicinc.com>
Date: Tue, 20 Feb 2024 17:58:32 +0530
From: Md Sadre Alam <quic_mdalam@...cinc.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        <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 2/16/2024 12:32 AM, Krzysztof Kozlowski wrote:
> 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
Ok
> 
>> 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.
Ok
> 
>> @@ -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.
Ok
> 
>> +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).
Ok
> 
> 
> Why the clocks are flexible? This given IPQ9574 has variable clock
> inputs? Please explain.

  I have checked Hardware Spec. and clocks are fixed in IPQ9574. Will fix in next
  patch.
> 
>> +
>> +  clock-names:
>> +    minItems: 2
>> +    maxItems: 3
>> +
> 
> required goes here.
Ok
> 
>> +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.
Ok
> 
>> +required:
>> +  - compatible
>> +  - reg
>> +  - clocks
>> +  - clock-names
>> +
>> +unevaluatedProperties: false
>> +
>> +examples:
>> +  - |
>> +    #include <dt-bindings/clock/qcom,ipq9574-gcc.h>
>> +    qpic_nand: spi@...0000 {
> 
> Drop unused label
Ok
> 
>> +        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.
Ok
> 
>> +        };
> 
> Best regards,
> Krzysztof
>