linux-kernel - RE: [PATCH 4/4] arm64: dts: lx2160a: update fspi node

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Message-ID: <VI1PR04MB1038ECE25B571117405A617799EA0@VI1PR04MB1038.eurprd04.prod.outlook.com>
Date:   Thu, 4 Oct 2018 09:24:57 +0000
From:   Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
To:     Boris Brezillon <boris.brezillon@...tlin.com>
CC:     "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "marek.vasut@...il.com" <marek.vasut@...il.com>,
        "vigneshr@...com" <vigneshr@...com>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "robh@...nel.org" <robh@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "computersforpeace@...il.com" <computersforpeace@...il.com>,
        "frieder.schrempf@...eet.de" <frieder.schrempf@...eet.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 4/4] arm64: dts: lx2160a: update fspi node

Hi Boris,

> -----Original Message-----
> From: Boris Brezillon [mailto:boris.brezillon@...tlin.com]
> Sent: Thursday, October 4, 2018 2:48 PM
> To: Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
> Cc: linux-mtd@...ts.infradead.org; marek.vasut@...il.com; vigneshr@...com;
> linux-spi@...r.kernel.org; devicetree@...r.kernel.org; robh@...nel.org;
> mark.rutland@....com; shawnguo@...nel.org; linux-arm-
> kernel@...ts.infradead.org; computersforpeace@...il.com;
> frieder.schrempf@...eet.de; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH 4/4] arm64: dts: lx2160a: update fspi node
> 
> On Thu,  4 Oct 2018 14:18:40 +0530
> Yogesh Gaur <yogeshnarayan.gaur@....com> wrote:
> 
> > Flash mt35xu512aba connected to FlexSPI controller supports
> > 1-1-8 protocol.
> > Added flag spi-rx-bus-width and spi-tx-bus-width with values as
> > 8 and 1 respectively for both flashes connected at CS0 and CS1.
> >
> > Signed-off-by: Yogesh Gaur <yogeshnarayan.gaur@....com>
> > ---
> >  arch/arm64/boot/dts/freescale/fsl-lx2160a-rdb.dts | 4 ++++
> >  1 file changed, 4 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/freescale/fsl-lx2160a-rdb.dts
> > b/arch/arm64/boot/dts/freescale/fsl-lx2160a-rdb.dts
> > index 901ca346..817175a 100644
> > --- a/arch/arm64/boot/dts/freescale/fsl-lx2160a-rdb.dts
> > +++ b/arch/arm64/boot/dts/freescale/fsl-lx2160a-rdb.dts
> > @@ -42,6 +42,8 @@
> >  		m25p,fast-read;
> >  		spi-max-frequency = <20000000>;
> >  		reg = <0>;
> > +		spi-rx-bus-width = <8>;
> > +		spi-tx-bus-width = <1>;
> 
> Why 1? The flash is already flagged with SPI_NOR_OCTAL_READ, which means
> only the read path will use 1-1-8 mode, so you can safely set spi-tx-bus-width
> here and let the framework choose the appropriate mode based on the flash
> capabilities.

Ok.

> 
> >  	};
> >
> >  	mt35xu512aba1: flash@1 {
> > @@ -51,6 +53,8 @@
> >  		m25p,fast-read;
> >  		spi-max-frequency = <20000000>;
> >  		reg = <1>;
> > +		spi-rx-bus-width = <8>;
> > +		spi-tx-bus-width = <1>;
> >  	};
> >  };
> >