linux-kernel - [PATCH] arm64: dts: ti: k3-am67a-kontron-sa67-base: fix QSPI flash timing

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Message-ID: <20260127122211.1064546-1-mwalle@kernel.org>
Date: Tue, 27 Jan 2026 13:22:03 +0100
From: Michael Walle <mwalle@...nel.org>
To: Nishanth Menon <nm@...com>,
	Vignesh Raghavendra <vigneshr@...com>,
	Tero Kristo <kristo@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>
Cc: Udit Kumar <u-kumar1@...com>,
	linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Michael Walle <mwalle@...nel.org>
Subject: [PATCH] arm64: dts: ti: k3-am67a-kontron-sa67-base: fix QSPI flash timing

The boot flash is connected to the QSPI bus, but that bus is also
connected to the edge connector. To prevent a stuck bus during boot. The
signals to the edge connected are guarded by a FET switch. This FET
switch needs a setup time of at least 80ns to disconnect the
passthrough otherwise the first few clock cycles are still visible on
the edge connector. Fix it by increasing the CS-to-clock timing to
120ns.

Fixes: 1c3c4df06f9d ("arm64: dts: ti: Add support for Kontron SMARC-sAM67")
Signed-off-by: Michael Walle <mwalle@...nel.org>
---
 arch/arm64/boot/dts/ti/k3-am67a-kontron-sa67-base.dts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/ti/k3-am67a-kontron-sa67-base.dts b/arch/arm64/boot/dts/ti/k3-am67a-kontron-sa67-base.dts
index cdc9b5778041..9c0489514e04 100644
--- a/arch/arm64/boot/dts/ti/k3-am67a-kontron-sa67-base.dts
+++ b/arch/arm64/boot/dts/ti/k3-am67a-kontron-sa67-base.dts
@@ -957,7 +957,7 @@ flash@0 {
 		cdns,tshsl-ns = <60>;
 		cdns,tsd2d-ns = <60>;
 		cdns,tchsh-ns = <60>;
-		cdns,tslch-ns = <60>;
+		cdns,tslch-ns = <120>;
 		cdns,read-delay = <3>;
 		vcc-supply = <&vcc_1p8_s0>;
 		bootph-all;
-- 
2.47.3