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

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Date:   Tue, 6 Dec 2022 09:04:21 +0000
From:   Xiangsheng Hou (侯祥胜) 
        <Xiangsheng.Hou@...iatek.com>
To:     "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "gch981213@...il.com" <gch981213@...il.com>,
        "vigneshr@...com" <vigneshr@...com>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>,
        "richard@....at" <richard@....at>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Benliang Zhao (赵本亮) 
        <Benliang.Zhao@...iatek.com>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Bin Zhang (章斌) <bin.zhang@...iatek.com>
Subject: Re: [PATCH v2 7/9] dt-bindings: spi: mtk-snfi: Add read latch latency
 property

Hi Angelo,

On Mon, 2022-12-05 at 15:21 +0100, AngeloGioacchino Del Regno wrote:
> 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?

The clock cycle will be various with MediaTek SPI NAND controller which
clock frequency can support 26/52/68/81/104MHz...
It`s may be easy to configure and understand with clock cycle in unit.

Thanks
Xiangsheng Hou