linux-kernel - Re: [PATCH] dt-bindings: ata: Add 'ata-generic' binding

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Message-ID: <0f330b8a-b4c3-3dcb-2754-2c95d8c85037@opensource.wdc.com>
Date:   Mon, 17 Oct 2022 12:06:15 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     Alexander Shiyan <shc_work@...l.ru>, linux-ide@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: ata: Add 'ata-generic' binding

On 10/11/22 22:58, Rob Herring wrote:
> The 'ata-generic' binding has been around since 2008, but never
> documented.
> 
> Cc: Alexander Shiyan <shc_work@...l.ru>
> Signed-off-by: Rob Herring <robh@...nel.org>
> ---
> AFAICT, the ata-generic,use16bit property has no effect in Linux. The
> 32-bit transfers fallback to 16-bit if ATA_PFLAG_PIO32 flag is not set
> which it doesn't appear to ever be set. Looking at the history, the
> driver always used 16-bit mode.
> 
> Linus, Okay with being maintainer here?

If Linus reply is positive, feel free to add:

Acked-by: Damien Le Moal <damien.lemoal@...nsource.wdc.com>

I can take this one through the libata tree also if you prefer.

> 
> ---
>  .../devicetree/bindings/ata/ata-generic.yaml  | 58 +++++++++++++++++++
>  1 file changed, 58 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/ata/ata-generic.yaml
> 
> diff --git a/Documentation/devicetree/bindings/ata/ata-generic.yaml b/Documentation/devicetree/bindings/ata/ata-generic.yaml
> new file mode 100644
> index 000000000000..0697927f3d7e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/ata/ata-generic.yaml
> @@ -0,0 +1,58 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/ata/ata-generic.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Generic Parallel ATA Controller
> +
> +maintainers:
> +  - Linus Walleij <linus.walleij@...aro.org>
> +
> +description:
> +  Generic Parallel ATA controllers supporting PIO modes only.
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - arm,vexpress-cf
> +          - fsl,mpc8349emitx-pata
> +      - const: ata-generic
> +
> +  reg:
> +    items:
> +      - description: Command interface registers
> +      - description: Control interface registers
> +
> +  reg-shift:
> +    enum: [ 1, 2 ]
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  ata-generic,use16bit:
> +    type: boolean
> +    description: Use 16-bit accesses instead of 32-bit for data transfers
> +
> +  pio-mode:
> +    description: Maximum ATA PIO transfer mode
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    maximum: 6
> +    default: 0
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    compact-flash@...00 {
> +        compatible = "arm,vexpress-cf", "ata-generic";
> +        reg = <0x1a000 0x100>,
> +              <0x1a100 0xf00>;
> +        reg-shift = <2>;
> +    };
> +...

-- 
Damien Le Moal
Western Digital Research