linux-kernel - [PATCH v2 3/4] arm64: dts: imx8mm-evk: limit the max frequency of spi nor chip

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Message-Id: <20250917-flexspi-dts-v2-3-7e2a95e3cf4d@nxp.com>
Date: Wed, 17 Sep 2025 16:42:29 +0800
From: Haibo Chen <haibo.chen@....com>
To: 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>, 
 Fabio Estevam <festevam@...il.com>, Michael Walle <michael@...le.cc>, 
 Peng Fan <peng.fan@....com>, Frank Li <frank.li@....com>, 
 Marco Felsch <m.felsch@...gutronix.de>, Han Xu <han.xu@....com>
Cc: devicetree@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Haibo Chen <haibo.chen@....com>
Subject: [PATCH v2 3/4] arm64: dts: imx8mm-evk: limit the max frequency of
 spi nor chip

The spi nor on imx8mm 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 this chip,
the max frequency of such case is 66MHz, so add the limitation
here to align with datasheet.

Refer to 3.9.10 FlexSPI timing parameters on page 59.
https://www.nxp.com/docs/en/data-sheet/IMX8MMIEC.pdf

Fixes: fa1652340af8 ("arm64: dts: imx8mm-evk: Add flexspi support")
Signed-off-by: Haibo Chen <haibo.chen@....com>
---
 arch/arm64/boot/dts/freescale/imx8mm-evk.dts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-evk.dts b/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
index b68954bcc383cfc799877ff64c5d9a59dd863907..bb57c1db7c64adb20c996bbc2e3996e1fde5b98a 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
@@ -47,7 +47,7 @@ flash@0 {
 		#address-cells = <1>;
 		#size-cells = <1>;
 		compatible = "jedec,spi-nor";
-		spi-max-frequency = <80000000>;
+		spi-max-frequency = <66000000>;
 		spi-tx-bus-width = <1>;
 		spi-rx-bus-width = <4>;
 	};

-- 
2.34.1