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

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Message-ID: <20181004111822.48ab1f5c@bbrezillon>
Date:   Thu, 4 Oct 2018 11:18:22 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Yogesh 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.

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