krane: enable USB xHCI, T-PHY and USB keyboard for the pogo keyboard

The pogo keyboard is a USB HID device behind the GL610 hub on
usb@11200000. Enable the USB stack (USB, DM_USB, USB_XHCI_HCD,
USB_XHCI_MTK, USB_STORAGE, CMD_USB), the MTK T-PHY (PHY_MTK_TPHY),
USB_KEYBOARD and CONFIG_USE_PREBOOT (preboot defaults to "usb start"
with USB_KEYBOARD) so the bus is enumerated before the prompt.

The upstream mt8183.dtsi models the SSUSB block for the Linux mtu3
dual-role driver: the IPPC register space and the phys live on the
parent mtu3 node while the xhci child has only its "mac" register.
U-Boot binds the "mediatek,mtk-xhci" child directly and expects
mac+ippc and a phys list on that node, so add a board
-u-boot.dtsi overlay (auto-included after the upstream dts) that
supplies them. No upstream DT files are modified.

stdin=serial,usbkbd routes the prompt through the USB keyboard once
the usb_kbd stdio device is registered.

arch/arm/dts/mt8183-kukui-krane-sku176-u-boot.dtsi

@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
+/*
+ * U-Boot-only additions for the MT8183 Kukui (krane) boards.
+ *
+ * The upstream mt8183.dtsi models the SSUSB block for the Linux mtu3
+ * dual-role driver: the IPPC register space and the phys are declared
+ * on the parent "mediatek,mtu3" node (ssusb@11201000), and the host
+ * child (usb@11200000) carries only its "mac" register.
+ *
+ * U-Boot has no mtu3 driver; it binds the "mediatek,mtk-xhci" child
+ * directly with drivers/usb/host/xhci-mtk.c, which expects the "mac"
+ * and "ippc" register names and a phys list on the xHCI node itself.
+ * Add the missing ippc address (taken from the ssusb node's "ippc"
+ * reg entry) and the port phys there.
+ */
+
+&usb_host {
+	reg = <0x0 0x11200000 0x0 0x1000>,
+	      <0x0 0x11203e00 0x0 0x0100>;
+	reg-names = "mac", "ippc";
+	phys = <&u2port0 PHY_TYPE_USB2>,
+	       <&u3port0 PHY_TYPE_USB3>;
+};

board/mediatek/mt8183/krane.env

@@ -1,3 +1,3 @@
-stdin=serial
+stdin=serial,usbkbd
 stdout=serial,vidconsole
 stderr=serial,vidconsole

configs/mt8183_kukui_krane_defconfig

@@ -35,6 +35,7 @@ CONFIG_HUSH_PARSER=y
 # CONFIG_CMD_GO is not set
 # CONFIG_CMD_IMI is not set
 CONFIG_BOOTDELAY=-1
+CONFIG_USE_PREBOOT=y
 CONFIG_BOARD_EARLY_INIT_F=y
 CONFIG_BOARD_EARLY_INIT_R=y
 CONFIG_MISC_INIT_R=y
@@ -60,6 +61,7 @@ CONFIG_CMD_SYSBOOT=y
 CONFIG_CMD_EXT4=y
 CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
+CONFIG_CMD_USB=y
 # CONFIG_DOS_PARTITION is not set
 CONFIG_ENV_IS_NOWHERE=y
 CONFIG_ENV_SOURCE_FILE="krane"
@@ -70,6 +72,14 @@ CONFIG_VIDEO_MT8183_SCANOUT=y
 # CONFIG_INPUT is not set
 # CONFIG_MMC_QUIRKS is not set
 CONFIG_MMC_MTK=y
+CONFIG_PHY=y
+CONFIG_PHY_MTK_TPHY=y
+CONFIG_USB=y
+CONFIG_DM_USB=y
+CONFIG_USB_XHCI_HCD=y
+CONFIG_USB_XHCI_MTK=y
+CONFIG_USB_KEYBOARD=y
+CONFIG_USB_STORAGE=y
 # CONFIG_POWER is not set
 CONFIG_BAUDRATE=921600
 CONFIG_DM_SERIAL=y