linux-kernel - [PATCH 09/13] arm64: dts: imx95-19x19-evk: Add Tsettle delay in m2 regulator

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Message-Id: <20250815-imx9-dts-v1-9-e609eb4e3105@nxp.com>
Date: Fri, 15 Aug 2025 17:03:55 +0800
From: Peng Fan <peng.fan@....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>, Frank Li <Frank.Li@....com>
Cc: devicetree@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Peng Fan <peng.fan@....com>, Richard Zhu <hongxing.zhu@....com>
Subject: [PATCH 09/13] arm64: dts: imx95-19x19-evk: Add Tsettle delay in m2
 regulator

From: Richard Zhu <hongxing.zhu@....com>

M.2 device only can be enabled after all Power Rails reach their minimum
operating voltage (PCI Express M.2 Specification r5.1 3.1.4 Power-up
Timing). Set a delay equal to the max value of Tsettle in m2 regulator.

Signed-off-by: Richard Zhu <hongxing.zhu@....com>
Signed-off-by: Peng Fan <peng.fan@....com>
---
 arch/arm64/boot/dts/freescale/imx95-19x19-evk.dts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx95-19x19-evk.dts b/arch/arm64/boot/dts/freescale/imx95-19x19-evk.dts
index feee6da65d37cae7413b09216014d6fe2b76b032..82e183dc581012a7c5be3d2bf749463d0a8a360d 100644
--- a/arch/arm64/boot/dts/freescale/imx95-19x19-evk.dts
+++ b/arch/arm64/boot/dts/freescale/imx95-19x19-evk.dts
@@ -136,6 +136,13 @@ reg_m2_pwr: regulator-m2-pwr {
 		regulator-max-microvolt = <3300000>;
 		gpio = <&i2c7_pcal6524 20 GPIO_ACTIVE_HIGH>;
 		enable-active-high;
+		/*
+		 * M.2 device only can be enabled(W_DISABLE1#) after all Power
+		 * Rails reach their minimum operating voltage (PCI Express M.2
+		 * Specification r5.1 3.1.4 Power-up Timing).
+		 * Set a delay equal to the max value of Tsettle here.
+		 */
+		startup-delay-us = <5000>;
 	};
 
 	reg_pcie0: regulator-pcie {

-- 
2.37.1