From: Richard Zhu <hongxing.zhu@nxp.com>
Date: Mon, 18 Aug 2025 01:25:38 +0000 (+0800)
Subject: arm64: dts: imx95-19x19-evk: Add Tsettle delay in m2 regulator
X-Git-Tag: v6.18-rc1~147^2~20^2~35
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=0898ed6832f5ce977e2a2c3d1556b156f2bc7502;p=thirdparty%2Flinux.git

arm64: dts: imx95-19x19-evk: Add Tsettle delay in m2 regulator

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@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
---

diff --git a/arch/arm64/boot/dts/freescale/imx95-19x19-evk.dts b/arch/arm64/boot/dts/freescale/imx95-19x19-evk.dts
index fc19b29e179db..3df7a046fbc8c 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 @@
 		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 {