linux-kernel - Re: [PATCH v1 1/2] dt-bindings: spi: Add support for cadence-qspi IP Intel LGM SoC

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Date:   Mon, 30 Sep 2019 17:36:40 -0500
From:   Rob Herring <robh@...nel.org>
To:     "Ramuthevar,Vadivel MuruganX" 
        <vadivel.muruganx.ramuthevar@...ux.intel.com>
Cc:     broonie@...nel.org, mark.rutland@....com,
        linux-spi@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, cheol.yong.kim@...el.com,
        qi-ming.wu@...el.com
Subject: Re: [PATCH v1 1/2] dt-bindings: spi: Add support for cadence-qspi IP
 Intel LGM SoC

On Mon, Sep 16, 2019 at 03:38:42PM +0800, Ramuthevar,Vadivel MuruganX wrote:
> From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
> 
> On Intel Lightening Mountain(LGM) SoCs QSPI controller support
> to QSPI-NAND flash. This introduces to device tree binding
> documentation for Cadence-QSPI controller and spi-nand flash.
> 
> Signed-off-by: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
> ---
>  .../devicetree/bindings/spi/cadence,qspi-nand.yaml | 84 ++++++++++++++++++++++
>  1 file changed, 84 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/spi/cadence,qspi-nand.yaml
> 
> diff --git a/Documentation/devicetree/bindings/spi/cadence,qspi-nand.yaml b/Documentation/devicetree/bindings/spi/cadence,qspi-nand.yaml
> new file mode 100644
> index 000000000000..9aae4c1459cc
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/spi/cadence,qspi-nand.yaml
> @@ -0,0 +1,84 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/spi/cadence,qspi-nand.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: Cadence QSPI Flash Controller on Intel's SoC
> +
> +maintainers:
> +  - Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
> +
> +allOf:
> +  - $ref: "spi-controller.yaml#"
> +
> +description: |
> +  The Cadence QSPI is a controller optimized for communication with SPI
> +  FLASH memories, without DMA support on Intel's SoC.
> +
> +properties:
> +  compatible:
> +    const: cadence,lgm-qspi

Vendor here should be 'intel'. Perhaps the binding should be shared too 
like the driver.

Plus the vendor prefix for Cadence is cdns.

> +
> +  reg:
> +    maxItems: 1
> +
> +  fifo-depth:
> +    maxItems: 1
> +
This is vendor specific, so needs a vendor prefix, type, and 
description.

> +  fifo-width:
> +    maxItems: 1

Same

> +
> +  qspi-phyaddr:
> +    maxItems: 1

Same

> +
> +  qspi-phymask:
> +    maxItems: 1

Same

> +
> +  clocks:
> +    maxItems: 2

Need to define what each clock is when there is more than 1.

> +
> +  clocks-names:
> +    maxItems: 2

Need to define the strings.

> +
> +  resets:
> +    maxItems: 1
> +
> +  reset-names:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - fifo-depth
> +  - fifo-width
> +  - qspi-phyaddr
> +  - qspi-phymask
> +  - clocks
> +  - clock-names
> +  - resets
> +  - reset-names
> +
> +examples:
> +  - |
> +    qspi@...00000 {

spi@...

> +          compatible = "cadence,qspi-nand";
> +          reg = <0xec000000 0x100>;
> +          fifo-depth = <128>;
> +          fifo-width = <4>;
> +          qspi-phyaddr = <0xf4000000>;
> +          qspi-phymask = <0xffffffff>;
> +          clocks = <&cgu0 LGM_CLK_QSPI>, <&cgu0 LGM_GCLK_QSPI>;
> +          clock-names = "freq", "qspi";
> +          resets = <&rcu0 0x10 1>;
> +          reset-names = "qspi";
> +          #address-cells = <1>;
> +          #size-cells = <0>;
> +
> +          flash: flash@1 {
> +              compatible = "spi-nand";
> +              reg = <1>;
> +              spi-max-frequency = <10000000>;
> +          };
> +    };
> +
> -- 
> 2.11.0
>