linux-kernel - Re: [PATCH v2 1/3] arm64: dts: ti: k3-j721e-som-p0: Enable 8D-8D-8D mode on OSPI

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Date:   Fri, 5 Mar 2021 21:42:03 +0530
From:   Vignesh Raghavendra <vigneshr@...com>
To:     Pratyush Yadav <p.yadav@...com>, Nishanth Menon <nm@...com>,
        Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] arm64: dts: ti: k3-j721e-som-p0: Enable 8D-8D-8D
 mode on OSPI



On 3/5/21 9:09 PM, Pratyush Yadav wrote:
> Set the Tx bus width to 8 so 8D-8D-8D mode can be selected. Change the
> frequency to 25 MHz. This is the frequency that the flash has been
> successfully tested with in Octal DTR mode. The total performance should
> still increase since 8D-8D-8D mode should be at least twice as fast as
> 1S-1S-8S mode.
> 
> Signed-off-by: Pratyush Yadav <p.yadav@...com>
> ---
> 

Reviewed-by: Vignesh Raghavendra <vigneshr@...com>

> Notes:
>     No changes in v2.
> 
>  arch/arm64/boot/dts/ti/k3-j721e-som-p0.dtsi | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-j721e-som-p0.dtsi b/arch/arm64/boot/dts/ti/k3-j721e-som-p0.dtsi
> index 57720e6a04c5..2fee2906183d 100644
> --- a/arch/arm64/boot/dts/ti/k3-j721e-som-p0.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-j721e-som-p0.dtsi
> @@ -174,9 +174,9 @@ &ospi0 {
>  	flash@0{
>  		compatible = "jedec,spi-nor";
>  		reg = <0x0>;
> -		spi-tx-bus-width = <1>;
> +		spi-tx-bus-width = <8>;
>  		spi-rx-bus-width = <8>;
> -		spi-max-frequency = <40000000>;
> +		spi-max-frequency = <25000000>;
>  		cdns,tshsl-ns = <60>;
>  		cdns,tsd2d-ns = <60>;
>  		cdns,tchsh-ns = <60>;
>