linux-kernel - Re: [PATCH 7/9] dt-bindings: spi: mtk-snfi: add two timing delay property

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Message-ID: <741d7ce16df25450b08c92e508190bc7c91fc8d9.camel@mediatek.com>
Date:   Wed, 30 Nov 2022 08:18:29 +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>,
        "krzysztof.kozlowski@...aro.org" <krzysztof.kozlowski@...aro.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>,
        "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 7/9] dt-bindings: spi: mtk-snfi: add two timing delay
 property

Hi Krzysztof,

On Tue, 2022-11-29 at 08:47 +0100, Krzysztof Kozlowski wrote:
> On 29/11/2022 03:50, Xiangsheng Hou (侯祥胜) wrote:
> 
> > > > --- a/Documentation/devicetree/bindings/spi/mediatek,spi-mtk-
> > > > snfi.yaml
> > > > +++ b/Documentation/devicetree/bindings/spi/mediatek,spi-mtk-
> > > > snfi.yaml
> > > > @@ -55,6 +55,22 @@ properties:
> > > >      description: device-tree node of the accompanying ECC
> > > > engine.
> > > >      $ref: /schemas/types.yaml#/definitions/phandle
> > > >  
> > > > +  rx-sample-delay:
> > > 
> > > No, use existing property, don't invent your own stuff - missing
> > > unit
> > > suffix. See spi-peripheral-props.yaml.
> > 
> > Will change to other private property. The read sample delay with
> > MediaTek SPI NAND controller can be set with values from 0 to 47.
> > However, it`s difficult to say the unit of each vaule, because the
> > unit
> > value will be difference with different chip process or different
> > corner IC.
> 
> Why you cannot use same formula as other SPI drivers for sample-
> delay?
> And divide/multiple by some factor specific to SoC, which is taken
> from
> driver_data?

Even for specific SoC, the unit of sample delay may be various with
different corner IC.
Besides, whether it`s acceptable by change the property rx-sample-delay 
and rx-latch-latency to mediatek,rx-sample-delay and mediatek,rx-latch-
latency?

Thanks
Xiangsheng Hou