linux-kernel - Re: [PATCH v2 7/9] dt-bindings: spi: mtk-snfi: Add read latch latency property

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Message-ID: <ce449a0c-efcc-0ac1-fb8e-c2b4148a5bc1@collabora.com>
Date:   Mon, 5 Dec 2022 15:21:28 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Xiangsheng Hou <xiangsheng.hou@...iatek.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Chuanhong Guo <gch981213@...il.com>
Cc:     linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-spi@...r.kernel.org, benliang.zhao@...iatek.com,
        bin.zhang@...iatek.com
Subject: Re: [PATCH v2 7/9] dt-bindings: spi: mtk-snfi: Add read latch latency
 property

Il 05/12/22 07:57, Xiangsheng Hou ha scritto:
> Add mediatek,rx-latch-latency property which adjust read delay in the
> unit of clock cycle.
> 
> Signed-off-by: Xiangsheng Hou <xiangsheng.hou@...iatek.com>
> Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> ---
>   .../devicetree/bindings/spi/mediatek,spi-mtk-snfi.yaml     | 7 +++++++
>   1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/spi/mediatek,spi-mtk-snfi.yaml b/Documentation/devicetree/bindings/spi/mediatek,spi-mtk-snfi.yaml
> index bab23f1b11fd..6e6ff8d73fcd 100644
> --- a/Documentation/devicetree/bindings/spi/mediatek,spi-mtk-snfi.yaml
> +++ b/Documentation/devicetree/bindings/spi/mediatek,spi-mtk-snfi.yaml
> @@ -45,6 +45,13 @@ properties:
>       description: device-tree node of the accompanying ECC engine.
>       $ref: /schemas/types.yaml#/definitions/phandle
>   
> +  mediatek,rx-latch-latency:
> +    description: Rx delay to sample data with this value, the value
> +                 unit is clock cycle.

Can't we use nanoseconds or microseconds as a unit here, instead of clock cycles?

Regards,
Angelo