linux-kernel - Re: [PATCH v3 1/2] spi: cadence: add dt-bindings documentation for Cadence XSPI controller

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Message-ID: <20210903181722.ukarfanyew2b7yoz@ti.com>
Date:   Fri, 3 Sep 2021 23:47:24 +0530
From:   Pratyush Yadav <p.yadav@...com>
To:     Parshuram Thombare <pthombar@...ence.com>
CC:     <broonie@...nel.org>, <lukas@...ner.de>, <robh+dt@...nel.org>,
        <linux-spi@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <jpawar@...ence.com>,
        <mparab@...ence.com>, Konrad Kociolek <konrad@...ence.com>
Subject: Re: [PATCH v3 1/2] spi: cadence: add dt-bindings documentation for
 Cadence XSPI controller

On 01/09/21 02:37PM, Parshuram Thombare wrote:
> Add DT binding for Cadence's XSPI controller driver.
> 
> Signed-off-by: Konrad Kociolek <konrad@...ence.com>
> Signed-off-by: Jayshri Pawar <jpawar@...ence.com>
> Signed-off-by: Parshuram Thombare <pthombar@...ence.com>
> ---
>  .../devicetree/bindings/spi/cdns,xspi.yaml         | 66 ++++++++++++++++++++++
>  1 file changed, 66 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/spi/cdns,xspi.yaml
> 
> diff --git a/Documentation/devicetree/bindings/spi/cdns,xspi.yaml b/Documentation/devicetree/bindings/spi/cdns,xspi.yaml
> new file mode 100644
> index 0000000..e52d6fa
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/spi/cdns,xspi.yaml
> @@ -0,0 +1,66 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright 2020-21 Cadence
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/spi/cdns,xspi.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: Cadence XSPI Controller
> +
> +maintainers:
> +  - Parshuram Thombare <pthombar@...ence.com>
> +
> +description: |
> +  The XSPI controller allows SPI protocol communication in
> +  single, dual, quad or octal wire transmission modes for
> +  read/write access to slaves such as SPI-NOR flash.

This needs to be a "subclass" of the spi-controller.yaml binding.

allOf:
  - $ref: spi-controller.yaml#

> +
> +properties:
> +  compatible:
> +    const: cdns,xspi-nor
> +
> +  reg:
> +    items:
> +      - description: address and length of the controller register set
> +      - description: address and length of the Slave DMA data port
> +      - description: address and length of the auxiliary registers
> +
> +  reg-names:
> +    items:
> +      - const: xspi-iobase
> +      - const: xspi-sdmabase
> +      - const: xspi-auxbase
> +
> +  interrupts:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +
> +    xspi: spi@...10000 {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +        compatible = "cdns,xspi-nor";
> +        reg = <0x0 0xa0010000 0x0 0x10000>,
> +              <0x0 0xb0000000 0x0 0x10000>,
> +              <0x0 0xa0020000 0x0 0x10000>;
> +        reg-names = "xspi-iobase", "xspi-sdmabase", "xspi-auxbase";
> +        interrupts = <0 90 IRQ_TYPE_LEVEL_HIGH>;
> +        interrupt-parent = <&gic>;
> +        mt35xu512@0 {

Node name should be flash@0.

> +            compatible = "spi-nor", "micron,mt35xu512";

These compatibles are arbitrary and undocumented. You probably just need 
"jedec,spi-nor". If you need anything else, you need to justify why.

Please run dt_binding_check, it should point this out. See [0].

> +            spi-max-frequency = <75000000>;
> +            reg = <0>;
> +        };
> +        mt35xu512@1 {
> +            compatible = "spi-nor", "micron,mt35xu512";

Same as above.

> +            spi-max-frequency = <75000000>;
> +            reg = <1>;
> +        };
> +    };
> -- 
> 2.7.4
> 

[0] https://www.kernel.org/doc/html/latest/devicetree/bindings/writing-schema.html#testing

-- 
Regards,
Pratyush Yadav
Texas Instruments Inc.