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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <VI1PR04MB1038A3CE7098227B6912C6F699EA0@VI1PR04MB1038.eurprd04.prod.outlook.com>
Date:   Thu, 4 Oct 2018 09:27:07 +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



> -----Original Message-----
> From: Boris Brezillon [mailto:boris.brezillon@...tlin.com]
> Sent: Thursday, October 4, 2018 2:56 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 09:24:57 +0000
> Yogesh Narayan Gaur <yogeshnarayan.gaur@....com> wrote:
> 
> > 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
> 
> I meant 'set spi-tx-bus-width to 8' here

Yes.

> 
> > > 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>;
> > > >  	};
> > > >  };
> > > >
> >