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