linux-kernel - [PATCH 4/4] arm64: dts: imx8mp-venice-gw74xx: fix TPM SPI frequency

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Message-Id: <20250523173723.4167474-4-tharvey@gateworks.com>
Date: Fri, 23 May 2025 10:37:23 -0700
From: Tim Harvey <tharvey@...eworks.com>
To: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-stable@...r.kernel.org
Cc: imx@...ts.linux.dev,
	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>,
	Tim Harvey <tharvey@...eworks.com>
Subject: [PATCH 4/4] arm64: dts: imx8mp-venice-gw74xx: fix TPM SPI frequency

The IMX8MPDS Table 37 [1] shows that the max SPI master read frequency
depends on the pins the interface is muxed behind with ECSPI2
muxed behind ECSPI2 supporting up to 25MHz.

Adjust the spi-max-frequency based on these findings.

Fixes: 531936b218d8 ("arm64: dts: imx8mp-venice-gw74xx: update to revB PCB")
Signed-off-by: Tim Harvey <tharvey@...eworks.com>
---
 arch/arm64/boot/dts/freescale/imx8mp-venice-gw74xx.dts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mp-venice-gw74xx.dts b/arch/arm64/boot/dts/freescale/imx8mp-venice-gw74xx.dts
index f00099f0cd4e..12de7cf1e853 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp-venice-gw74xx.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mp-venice-gw74xx.dts
@@ -201,7 +201,7 @@ &ecspi1 {
 	tpm@0 {
 		compatible = "atmel,attpm20p", "tcg,tpm_tis-spi";
 		reg = <0x0>;
-		spi-max-frequency = <36000000>;
+		spi-max-frequency = <25000000>;
 	};
 };
 
-- 
2.25.1