mb/google/zork: only enable RTD2141 when present

An MST hub is only present on some devices that are configured with a
particular daughterboard indicated by EC fw_config, so add a fw_config
probe that matches the USB daughterboard ID from CBI to only enable it
on devices where present, using variant-specific daughterboard IDs.

BUG=b:185862297
TEST=RTD2141 remains in ACPI tables on a berknip with Dali DB, and is
     not present on the same system if probe is changed to enable it
     for picasso DB.
BRANCH=zork

Change-Id: I4ada9b492ab221fa98350bf2faf27a23342f3a55
Signed-off-by: Peter Marheine <pmarheine@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56990
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sam McNally <sammc@google.com>

src/mainboard/google/zork/variants/baseboard/devicetree_trembyle.cb

@@ -1,4 +1,9 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
+
+fw_config
+	field USB_DAUGHTERBOARD 0 3 end
+end
+
 chip soc/amd/picasso
 
 	# Set FADT Configuration
@@ -408,7 +413,8 @@ chip soc/amd/picasso
 								register "name" = ""MSTH""
 								register "uid" = "1"
 								register "desc" = ""Realtek RTD2141B""
-								device i2c 4a on end
+								# Device presence is variant-specific
+								device i2c 4a alias db_mst off end
 							end
 						end
 					end

src/mainboard/google/zork/variants/berknip/overridetree.cb

@@ -1,4 +1,12 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
+
+fw_config
+	field USB_DAUGHTERBOARD
+		option BERKNIP_DB_PICASSO 0
+		option BERKNIP_DB_DALI 1
+	end
+end
+
 chip soc/amd/picasso
 
 	# Start : OPN Performance Configuration
@@ -171,4 +179,8 @@ chip soc/amd/picasso
 		end
 	end
 
+	device ref db_mst on
+		probe USB_DAUGHTERBOARD BERKNIP_DB_DALI
+	end
+
 end	# chip soc/amd/picasso

src/mainboard/google/zork/variants/morphius/overridetree.cb

@@ -1,4 +1,12 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
+
+fw_config
+	field USB_DAUGHTERBOARD
+		option MORPHIUS_DB_PICASSO 0
+		option MORPHIUS_DB_DALI 1
+	end
+end
+
 chip soc/amd/picasso
 
 	# Start : OPN Performance Configuration
@@ -136,4 +144,8 @@ chip soc/amd/picasso
 		end
 	end
 
+	device ref db_mst on
+		probe USB_DAUGHTERBOARD MORPHIUS_DB_DALI
+	end
+
 end	# chip soc/amd/picasso

src/mainboard/google/zork/variants/trembyle/overridetree.cb

@@ -1,4 +1,13 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
+
+fw_config
+	field USB_DAUGHTERBOARD
+		option TREMBYLE_DB_PICASSO 0
+		option TREMBYLE_DB_DALI 1
+		option TREMBYLE_DB_DALI_HDMI 2
+	end
+end
+
 chip soc/amd/picasso
 
 	# Start : OPN Performance Configuration
@@ -104,4 +113,8 @@ chip soc/amd/picasso
 		end
 	end
 
+	device ref db_mst on
+		probe USB_DAUGHTERBOARD TREMBYLE_DB_DALI_HDMI
+	end
+
 end	# chip soc/amd/picasso

src/mainboard/google/zork/variants/woomax/overridetree.cb

@@ -1,5 +1,12 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 
+fw_config
+	field USB_DAUGHTERBOARD
+		option WOOMAX_DB_PICASSO 0
+		option WOOMAX_DB_DALI 1
+	end
+end
+
 chip soc/amd/picasso
 
 	# Start : OPN Performance Configuration
@@ -110,4 +117,8 @@ chip soc/amd/picasso
 		end
 	end
 
+	device ref db_mst on
+		probe USB_DAUGHTERBOARD WOOMAX_DB_DALI
+	end
+
 end	# chip soc/amd/picasso