linux-kernel - Re: [PATCH 1/2] dt-bindings: spi: Convert QSPI bindings to YAML

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Date:   Fri, 13 Mar 2020 16:21:22 +0530
From:   Akash Asthana <akashast@...eaurora.org>
To:     Stephen Boyd <swboyd@...omium.org>, agross@...nel.org,
        mark.rutland@....com, robh+dt@...nel.org
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, mgautam@...eaurora.org,
        rojay@...eaurora.org, skakit@...eaurora.org
Subject: Re: [PATCH 1/2] dt-bindings: spi: Convert QSPI bindings to YAML

Hi Stephen,

On 2/20/2020 7:59 AM, Stephen Boyd wrote:
> Quoting Akash Asthana (2020-02-17 01:49:33)
>> diff --git a/Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.yaml b/Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.yaml
>> new file mode 100644
>> index 0000000..977070a
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.yaml
>> @@ -0,0 +1,89 @@
>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> +
>> +%YAML 1.2
>> +---
>> +$id:"http://devicetree.org/schemas/spi/qcom,spi-qcom-qspi.yaml#"
>> +$schema:"http://devicetree.org/meta-schemas/core.yaml#"
>> +
>> +title: Qualcomm Quad Serial Peripheral Interface (QSPI)
>> +
>> +maintainers:
>> + - Mukesh Savaliya<msavaliy@...eaurora.org>
>> + - Akash Asthana<akashast@...eaurora.org>
>> +
>> +description: |
> Drop the | because it doesn't look like any formatting needs to be
> maintained in the text for the description.
ok
>> + The QSPI controller allows SPI protocol communication in single, dual, or quad
>> + wire transmission modes for read/write access to slaves such as NOR flash.
>> +
>> +allOf:
>> +  - $ref: /spi/spi-controller.yaml#
>> +
>> +properties:
>> +  compatible:
>> +    items:
>> +      - const: qcom,sdm845-qspi
>> +      - const: qcom,qspi-v1
>> +
>> +  reg:
>> +    description: Base register location and length.
> Drop description? It doesn't seem useful.
ok
>> +    maxItems: 1
>> +
>> +  interrupts:
>> +    maxItems: 1
>> +
>> +  clock-names:
>> +    items:
>> +      - const: iface
>> +      - const: core
>> +
>> +  clocks:
>> +    items:
>> +      - description: AHB clock
>> +      - description: QSPI core clock.
> Please drop the full-stop on core clock.
ok
>> +
>> +  "#address-cells":
>> +     const: 1
>> +
>> +  "#size-cells":
>> +    const: 0
> Aren't these two unnecessary because they're covered by the
> spi-controller.yaml binding?
ok
>
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - interrupts
>> +  - clock-names
>> +  - clocks
>> +  - "#address-cells"
>> +  - "#size-cells"
> These last two are also covered by spi-controller binding.
ok will remove
>> +
>> +
> Why two newlines instead of one?
>
>> +examples:
>> +  - |
>> +    #include <dt-bindings/clock/qcom,gcc-sdm845.h>
>> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
>> +
>> +    soc: soc@0 {
> Remove this node from example please.

If I remove this node I am getting below compilation error.

Error: 
Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.example.dts:46.1-2 
syntax error
FATAL ERROR: Unable to parse input tree
scripts/Makefile.lib:311: recipe for target 
'Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.example.dt.yaml' 
failed
make[1]: *** 
[Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.example.dt.yaml] 
Error 1
Makefile:1264: recipe for target 'dt_binding_check' failed
make: *** [dt_binding_check] Error 2

>
>> +        #address-cells = <2>;
>> +        #size-cells = <2>;
>> +
>> +        qspi: spi@...f000 {
>> +            compatible = "qcom,sdm845-qspi", "qcom,qspi-v1";
>> +            reg = <0 0x88df000 0 0x600>;
>> +            #address-cells = <1>;
>> +            #size-cells = <0>;
>> +            interrupts = <GIC_SPI 82 IRQ_TYPE_LEVEL_HIGH>;
>> +            clock-names = "iface", "core";
>> +            clocks = <&gcc GCC_QSPI_CNOC_PERIPH_AHB_CLK>,
>> +                <&gcc GCC_QSPI_CORE_CLK>;
> Weird tabbing here. Just use spaces and align it up.
Ok, I will align it better.
>
>> +
>> +                flash@0 {
>> +                    compatible = "jedec,spi-nor";
>> +                    reg = <0>;
>> +                    spi-max-frequency = <25000000>;
>> +                    spi-tx-bus-width = <2>;
>> +                    spi-rx-bus-width = <2>;
>> +                };
> Is this flash node necessary for the example?

It's not neccessary.

I just preserved the original example from .txt binding file.

>
>> +        };
>> +    };
>> +
> Nitpick: Why newline here?

Will remove it.

Thankyou for reviewing the patch.


Regards,

Akash

>
>> +...

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