[PATCH v2 08/11] arm64: dts: imx95-19x19-evk: Add Tsettle delay in m2 regulator

[Peng Fan <peng.fan@nxp.com>]

From: Richard Zhu <hongxing.zhu@nxp.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@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.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 39815b21d235d2f8cfa49720d3be49d056ea039a..6d2f09404bdb8bee62532f1e02f59bd5a899833e 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