linux-kernel - Re: [PATCH 2/2] arm64: dts: imx8mm/mn/mp: limit the max frequency of spi nor chip

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Message-ID: <CAOMZO5DYWenp7fzrthWUiEyOHAVcL02wBqvzA3RyPqiQ8CzGUw@mail.gmail.com>
Date: Tue, 16 Sep 2025 06:42:03 -0300
From: Fabio Estevam <festevam@...il.com>
To: Haibo Chen <haibo.chen@....com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, 
	Sascha Hauer <s.hauer@...gutronix.de>, Pengutronix Kernel Team <kernel@...gutronix.de>, 
	devicetree@...r.kernel.org, imx@...ts.linux.dev, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] arm64: dts: imx8mm/mn/mp: limit the max frequency of
 spi nor chip

Hi Haibo,

On Tue, Sep 16, 2025 at 5:57 AM Haibo Chen <haibo.chen@....com> wrote:
>
> The spi nor on imx8mm/mn/mp evk board works under SDR mode, and
> driver use FlexSPIn_MCR0[RXCLKSRC] = 0x0 for SDR mode.
> According to the datasheet, there is IO limitation on these chips,
> the max frequency of such case is 66MHz, so add the limatation here

Typo: limitation.

> to align with datasheet.
>
> Refer to 3.9.9 FlexSPI timing parameters on page 65.
> https://www.nxp.com/docs/en/data-sheet/IMX8MNCEC.pdf

Fixes tag?