arm64: dts: ti: iot2050: Factor out enabling of USB3 support

Already simplifies the existing code by avoid the switch back in the m2
variant to what k3-am65-main.dtsi provided as base.

Signed-off-by: Jan Kiszka <[e-mail]>
Link: https://lore.kernel.org/r/51[e-mail]
Signed-off-by: Vignesh Raghavendra <[e-mail]>

arch/arm64/boot/dts/ti/k3-am65-iot2050-common-pg2.dtsi

···
 	/* Workaround needed to get DP clock of 154Mhz */
 	assigned-clocks = <&k3_clks 67 0>;
 };
-
-&serdes0 {
-	assigned-clocks = <&k3_clks 153 4>, <&serdes0 AM654_SERDES_CMU_REFCLK>;
-	assigned-clock-parents = <&k3_clks 153 7>, <&k3_clks 153 4>;
-};
-
-&dwc3_0 {
-	assigned-clock-parents = <&k3_clks 151 4>,  /* set REF_CLK to 20MHz i.e. PER0_PLL/48 */
-				 <&k3_clks 151 8>;  /* set PIPE3_TXB_CLK to WIZ8B2M4VSB */
-	phys = <&serdes0 PHY_TYPE_USB3 0>;
-	phy-names = "usb3-phy";
-};
-
-&usb0 {
-	maximum-speed = "super-speed";
-	snps,dis-u1-entry-quirk;
-	snps,dis-u2-entry-quirk;
-};

arch/arm64/boot/dts/ti/k3-am65-iot2050-usb3.dtsi

···
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) Siemens AG, 2024
+ *
+ * Authors:
+ *   Jan Kiszka <[e-mail]>
+ *
+ * Common bits for IOT2050 variants with USB3 support
+ */
+
+&serdes0 {
+	assigned-clocks = <&k3_clks 153 4>, <&serdes0 AM654_SERDES_CMU_REFCLK>;
+	assigned-clock-parents = <&k3_clks 153 7>, <&k3_clks 153 4>;
+};
+
+&dwc3_0 {
+	assigned-clock-parents = <&k3_clks 151 4>,  /* set REF_CLK to 20MHz i.e. PER0_PLL/48 */
+				 <&k3_clks 151 8>;  /* set PIPE3_TXB_CLK to WIZ8B2M4VSB */
+	phys = <&serdes0 PHY_TYPE_USB3 0>;
+	phy-names = "usb3-phy";
+};
+
+&usb0 {
+	maximum-speed = "super-speed";
+	snps,dis-u1-entry-quirk;
+	snps,dis-u2-entry-quirk;
+};

arch/arm64/boot/dts/ti/k3-am6528-iot2050-basic-pg2.dts

···
 
 #include "k3-am6528-iot2050-basic-common.dtsi"
 #include "k3-am65-iot2050-common-pg2.dtsi"
+#include "k3-am65-iot2050-usb3.dtsi"
 
 / {
 	compatible = "siemens,iot2050-basic-pg2", "ti,am654";

arch/arm64/boot/dts/ti/k3-am6548-iot2050-advanced-m2.dts

···
 &pcie1_rc {
 	status = "disabled";
 };
-
-&dwc3_0 {
-	assigned-clock-parents = <&k3_clks 151 4>,  /* set REF_CLK to 20MHz i.e. PER0_PLL/48 */
-				 <&k3_clks 151 9>;  /* set PIPE3_TXB_CLK to CLK_12M_RC/256 (for HS only) */
-	/delete-property/ phys;
-	/delete-property/ phy-names;
-};
-
-&usb0 {
-	maximum-speed = "high-speed";
-	/delete-property/ snps,dis-u1-entry-quirk;
-	/delete-property/ snps,dis-u2-entry-quirk;
-};

arch/arm64/boot/dts/ti/k3-am6548-iot2050-advanced-pg2.dts

···
 #include "k3-am6548-iot2050-advanced-common.dtsi"
 #include "k3-am65-iot2050-common-pg2.dtsi"
 #include "k3-am65-iot2050-arduino-connector.dtsi"
+#include "k3-am65-iot2050-usb3.dtsi"
 
 / {
 	compatible = "siemens,iot2050-advanced-pg2", "ti,am654";