arm: dt: add dtparams for PCIe reset timing override

The Pi 5 variant gets two parameters so that the CM4-compatible name will also work on Pi 5. Signed-off-by: Jonathan Bell <[email protected]>
raspberrypi · Oct 26, 2023 · bdc0ca3 · bdc0ca3
1 parent 697b933
commit bdc0ca3
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diff --git a/arch/arm/boot/dts/bcm2711-rpi-cm4.dts b/arch/arm/boot/dts/bcm2711-rpi-cm4.dts
@@ -446,5 +446,7 @@ i2c_csi_dsi0: &i2c0 {
 		cam1_reg = <&cam1_reg>,"status";
 		cam1_reg_gpio = <&cam1_reg>,"gpio:4",
 				  <&cam1_reg>,"gpio:0=", <&gpio>;
+
+		pcie_tperst_clk_ms = <&pcie0>,"brcm,tperst-clk-ms:0";
 	};
 };
diff --git a/arch/arm/boot/dts/bcm2712-rpi-5-b.dts b/arch/arm/boot/dts/bcm2712-rpi-5-b.dts
@@ -814,6 +814,8 @@ spi10_cs_pins: &spi10_cs_gpio1 {};
 		pciex1 = <&pciex1>, "status";
 		pciex1_gen = <&pciex1> , "max-link-speed:0";
 		pciex1_no_l0s = <&pciex1>, "aspm-no-l0s?";
+		pciex1_tperst_clk_ms = <&pciex1>, "brcm,tperst-clk-ms:0";
+		pcie_tperst_clk_ms = <&pciex1>, "brcm,tperst-clk-ms:0";
 		random = <&random>, "status";
 		rtc_bbat_vchg = <&rpi_rtc>, "trickle-charge-microvolt:0";
 		spi = <&spi0>, "status";

diff --git a/arch/arm/boot/dts/overlays/README b/arch/arm/boot/dts/overlays/README
@@ -280,6 +280,10 @@ Params:
                                 (2711 only, but not applicable on CM4S)
                                 N.B. USB-A ports on 4B are subsequently disabled
 
+        pcie_tperst_clk_ms      Add N milliseconds between PCIe reference clock
+                                activation and PERST# deassertion
+                                (CM4 and 2712, default "0")
+
         pciex1                  Set to "on" to enable the external PCIe link
                                 (2712 only, default "off")
 
@@ -290,6 +294,9 @@ Params:
                                 PCIe link for devices that have broken
                                 implementations (2712 only, default "off")
 
+        pciex1_tperst_clk_ms    Alias for pcie_tperst_clk_ms
+                                (2712 only, default "0")
+
         spi                     Set to "on" to enable the spi interfaces
                                 (default "off")