[S] Change in coreboot[master]: mb/google/skyrim/var/winterhold: Add support for AP-driven muxes

[Prashant Malani (Code Review)]

Prashant Malani has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/72654 )

Change subject: mb/google/skyrim/var/winterhold: Add support for AP-driven muxes
......................................................................

mb/google/skyrim/var/winterhold: Add support for AP-driven muxes

Add the platform ACPI devices needed for AP-driven Type-C mux and
retimer programming.

BUG=b:266218046
TEST=Tested on skyrim with Kconfig enabled, SSDT generated as expected.
BRANCH=None

Change-Id: I712a54e8b3bee8f4ead3b6cf2b495a8dda7962ad
---
M src/mainboard/google/skyrim/Kconfig
M src/mainboard/google/skyrim/variants/winterhold/overridetree.cb
2 files changed, 42 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/54/72654/1

diff --git a/src/mainboard/google/skyrim/Kconfig b/src/mainboard/google/skyrim/Kconfig
index d945474..19755cd 100644
--- a/src/mainboard/google/skyrim/Kconfig
+++ b/src/mainboard/google/skyrim/Kconfig
@@ -27,6 +27,7 @@
    select DRIVERS_PCIE_GENERIC
    select EC_GOOGLE_CHROMEEC
    select EC_GOOGLE_CHROMEEC_ESPI
+	select EC_GOOGLE_CHROMEEC_MUX
    select EC_GOOGLE_CHROMEEC_SKUID
    select EC_GOOGLE_CHROMEEC_BOARDID
    select ELOG
diff --git a/src/mainboard/google/skyrim/variants/winterhold/overridetree.cb b/src/mainboard/google/skyrim/variants/winterhold/overridetree.cb
index 04da26c..7f40e32 100644
--- a/src/mainboard/google/skyrim/variants/winterhold/overridetree.cb
+++ b/src/mainboard/google/skyrim/variants/winterhold/overridetree.cb
@@ -157,6 +157,31 @@
    			end
    		end # XHCI1 controller
    	end # Internal GPP Bridge 0 to Bus A
+
+		device ref lpc_bridge on
+			chip ec/google/chromeec
+				use ecmux0 as retimer_conn[0]
+				use ecmux1 as retimer_conn[1]
+				use ecmux0 as mux_conn[0]
+				use ecmux1 as mux_conn[1]
+				device ref chrome_ec on
+					chip ec/google/chromeec/mux
+						device generic 0 on
+							chip ec/google/chromeec/mux/conn
+								register "mode_switch" = "true"
+								register "retimer_switch" = "true"
+								device generic 0 alias ecmux0 on end
+							end
+							chip ec/google/chromeec/mux/conn
+								register "mode_switch" = "true"
+								register "retimer_switch" = "true"
+								device generic 1 alias ecmux1 on end
+							end
+						end
+					end
+				end
+			end
+		end
    end # domain

device ref i2c_0 on