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

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Message-ID: <158216578112.184098.9357700822184458798@swboyd.mtv.corp.google.com>
Date:   Wed, 19 Feb 2020 18:29:41 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Akash Asthana <akashast@...eaurora.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,
        Akash Asthana <akashast@...eaurora.org>
Subject: Re: [PATCH 1/2] dt-bindings: spi: Convert QSPI bindings to YAML

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.

> + 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.

> +    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.

> +
> +  "#address-cells":
> +     const: 1
> +
> +  "#size-cells":
> +    const: 0

Aren't these two unnecessary because they're covered by the
spi-controller.yaml binding?

> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clock-names
> +  - clocks
> +  - "#address-cells"
> +  - "#size-cells"

These last two are also covered by spi-controller binding.

> +
> +

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.

> +        #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.

> +
> +                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?

> +        };
> +    };
> +

Nitpick: Why newline here?

> +...