arm: dts: Update IOT2050 device tree files

This fixes the usage of the USB 3.0-capable port under U-Boot as USB
2.0-only port.

Original patch by Chao Zeng.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

diff --git a/arch/arm/dts/k3-am65-iot2050-common-pg2-u-boot.dtsi b/arch/arm/dts/k3-am65-iot2050-common-pg2-u-boot.dtsi
new file mode 100644 (file)
index 0000000..64dddce
--- /dev/null
+++ b/arch/arm/dts/k3-am65-iot2050-common-pg2-u-boot.dtsi
@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) Siemens AG, 2018-2021
+ *
+ * Authors:
+ *   Chao Zeng <chao.zeng@siemens.com>
+ *
+ * U-Boot bits of the IOT2050 Advanced PG2 variants
+ * (downgrade of usb0 to USB 2.0 mode)
+ */
+
+&serdes0 {
+       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;
+};

diff --git a/arch/arm/dts/k3-am65-iot2050-common-pg2.dtsi b/arch/arm/dts/k3-am65-iot2050-common-pg2.dtsi
index c25bce7..e7e0ca4 100644 (file)
--- a/arch/arm/dts/k3-am65-iot2050-common-pg2.dtsi
+++ b/arch/arm/dts/k3-am65-iot2050-common-pg2.dtsi
@@ -44,8 +44,10 @@
        phy-names = "usb3-phy";
 };
 
-&usb0_phy {
+&usb0 {
        maximum-speed = "super-speed";
        snps,dis-u1-entry-quirk;
        snps,dis-u2-entry-quirk;
 };
+
+#include "k3-am65-iot2050-common-pg2-u-boot.dtsi"