rex: Enable KB8010 retimer driver

This CL enables the kb8010 retimer driver for the SKU-2 DB.
Note that rework #11 is required for DP to function on SKU-2 DBs.

BUG=b:267589112
TEST=verified on SKU-2 Rex device that USB3 devices enumerate in both
polarities, and that DP is mode is working for CC1 polarity.
LOW_COVERAGE_REASON=early-phase platform, b/247796816

Change-Id: I1cfa7a4a990d14f851ecce751a8500b4eebaad1c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/4457871
Reviewed-by: caveh jalali <[email protected]>
Commit-Queue: Scott Collyer <[email protected]>
Tested-by: Scott Collyer <[email protected]>

Author: scott-collyer

zephyr/program/rex/rex.dtsi

@@ -332,6 +332,12 @@
 		frs_en_gpio = <&gpio_usb_c1_frs_en>;
 		is-alt;
 	};
+
+	usb_c1_kb8010_retimer: usb-c1-kb8010-retimer@8 {
+		compatible = "kandou,kb8010";
+		reg = <0x08>;
+		reset-pin = <&gpio_usb_c1_rt_rst_r_odl>;
+	};
 };
 
 &i2c7_0 {

zephyr/program/rex/rex/src/usbc_config.c

@@ -57,6 +57,8 @@ __override bool board_is_tbt_usb4_port(int port)
 {
 	if (port == USBC_PORT_C0)
 		return true;
+	if (port == USBC_PORT_C1 && usb_db_type != FW_USB_DB_USB3)
+		return true;
 
 	return false;
 }

zephyr/program/rex/screebo/project.overlay

@@ -188,6 +188,7 @@
 };
 
 &i2c6_1 {
+	/delete-node/ usb-c1-kb8010-retimer@8;
 	/delete-node/ ktu1125@38;
 	/delete-node/ ppc_syv@40;
 

zephyr/program/rex/usbc.dtsi

@@ -47,7 +47,8 @@
 			};
 			usb_mux_chain_kb8010_port1: usb-mux-chain-1-kb8010 {
 				compatible = "cros-ec,usb-mux-chain";
-				usb-muxes = <&virtual_mux_c1>;
+				usb-muxes = <&usb_c1_kb8010_retimer
+					     &virtual_mux_c1>;
 				alternative-chain;
 			};
 		};