linux-kernel - Re: [PATCH] arch: arm64: dts: add delay between CS and CLK signal for flash device

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Date:   Sun, 21 Nov 2021 17:17:38 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Meng Li <Meng.Li@...driver.com>
Cc:     leoyang.li@....com, robh+dt@...nel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH] arch: arm64: dts: add delay between CS and CLK signal
 for flash device

On Wed, Nov 03, 2021 at 11:38:38AM +0800, Meng Li wrote:
> Based on commit d59c90a2400f("spi: spi-fsl-dspi: Convert
> TCFQ users to XSPI FIFO mode ") and 6c1c26ecd9a3("spi:
> spi-fsl-dspi: Accelerate transfers using larger word size if possible"),
> on ls1043a-rdb platform, the spi work mode is changed from TCFQ
> mode to XSPI mode. In order to keep the transmission sequence matches
> with flash device, it is need to add delay between CS and CLK signal.
> The strategy of generating delay value refers to QorIQ LS1043A
> Reference Manual.
> 
> Signed-off-by: Meng Li <Meng.Li@...driver.com>

Updated the subject as below and applied the patch.

  arm64: dts: fsl-ls1043a-rdb: add delay between CS and CLK signal for flash device

Shawn