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 fc19b29e179db12b70c17070097e0e415cccb31c..3df7a046fbc8ce98091a7cbe64b03734cb0391ff 100644 (file)
--- 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 {