linux-kernel - RE: [PATCH 07/11] dt-bindings: spi: spi-nxp-fspi: add a new property nxp,fspi-dll-slvdly

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Date:   Tue, 5 Jul 2022 10:28:28 +0000
From:   Bough Chen <haibo.chen@....com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        "ashish.kumar@....com" <ashish.kumar@....com>,
        "yogeshgaur.83@...il.com" <yogeshgaur.83@...il.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>, Han Xu <han.xu@....com>,
        "singh.kuldeep87k@...il.com" <singh.kuldeep87k@...il.com>,
        "tudor.ambarus@...rochip.com" <tudor.ambarus@...rochip.com>,
        "p.yadav@...com" <p.yadav@...com>,
        "michael@...le.cc" <michael@...le.cc>,
        "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
        "richard@....at" <richard@....at>,
        "vigneshr@...com" <vigneshr@...com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>
CC:     "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "zhengxunli@...c.com.tw" <zhengxunli@...c.com.tw>
Subject: RE: [PATCH 07/11] dt-bindings: spi: spi-nxp-fspi: add a new property
 nxp,fspi-dll-slvdly

> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Sent: 2022年7月5日 17:48
> To: Bough Chen <haibo.chen@....com>; ashish.kumar@....com;
> yogeshgaur.83@...il.com; broonie@...nel.org; robh+dt@...nel.org;
> krzysztof.kozlowski+dt@...aro.org; Han Xu <han.xu@....com>;
> singh.kuldeep87k@...il.com; tudor.ambarus@...rochip.com;
> p.yadav@...com; michael@...le.cc; miquel.raynal@...tlin.com;
> richard@....at; vigneshr@...com; shawnguo@...nel.org;
> s.hauer@...gutronix.de; kernel@...gutronix.de
> Cc: linux-spi@...r.kernel.org; linux-kernel@...r.kernel.org;
> devicetree@...r.kernel.org; linux-mtd@...ts.infradead.org;
> festevam@...il.com; dl-linux-imx <linux-imx@....com>;
> linux-arm-kernel@...ts.infradead.org; zhengxunli@...c.com.tw
> Subject: Re: [PATCH 07/11] dt-bindings: spi: spi-nxp-fspi: add a new property
> nxp,fspi-dll-slvdly
> 
> On 05/07/2022 11:11, haibo.chen@....com wrote:
> > From: Haibo Chen <haibo.chen@....com>
> >
> > Add one optional property nxp,fspi-dll-slvdly
> >
> > Signed-off-by: Haibo Chen <haibo.chen@....com>
> > ---
> >  Documentation/devicetree/bindings/spi/spi-nxp-fspi.yaml | 6 ++++++
> >  1 file changed, 6 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/spi/spi-nxp-fspi.yaml
> b/Documentation/devicetree/bindings/spi/spi-nxp-fspi.yaml
> > index 1b552c298277..6bd61565686a 100644
> > --- a/Documentation/devicetree/bindings/spi/spi-nxp-fspi.yaml
> > +++ b/Documentation/devicetree/bindings/spi/spi-nxp-fspi.yaml
> > @@ -45,6 +45,12 @@ properties:
> >        - const: fspi_en
> >        - const: fspi
> >
> > +  nxp,fspi-dll-slvdly:
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +    description: |
> > +      Specify the DLL slave line delay value.
> 
> What are the units?

Do you mean here need to give more detail explain about this properity?

How about change like this?
   Specify the DLL slave line delay value. The delay target for slave delay line is: ((nxp,fspi-dll-slvdly+1) * 1/32 * clock cycle of reference clock (serial root clock). The range of this value is 0~16.


Best Regards
Haibo Chen

> 
> Best regards,
> Krzysztof