gpio: decouple tristate gpio support from board ID

This deprecates TERTIARY_BOARD_ID. Instead, a board will set
BOARD_ID_SUPPORT (the ones affected already do) which will set
GENERIC_GPIO_SUPPORT and compile the generic GPIO library.
The user is expected to handle the details of how the ID is encoded.

BUG=none
BRANCH=none
TEST=Compiled for peppy, nyan*, storm, and pinky

Change-Id: Iaf1cac6e90b6c931100e9d1b6735684fac86b8a8
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 93db63f419f596160ce2459eb70b3218cc83c09e
Original-Change-Id: I687877e5bb89679d0133bed24e2480216c384a1c
Original-Signed-off-by: David Hendricks <dhendrix@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/228322
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: http://review.coreboot.org/9413
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/Kconfig

@@ -1114,22 +1114,23 @@ config DEBUG_COVERAGE
 	  If enabled, the code coverage hooks in coreboot will output some
 	  information about the coverage data that is dumped.
 
+config GENERIC_GPIO_LIB
+	bool "Build generic GPIO library"
+	default n
+	help
+	  If enabled, compile the generic GPIO library. A "generic" GPIO
+	  implies configurability usually found on SoCs, particularly the
+	  ability to control internal pull resistors.
+
 config BOARD_ID_SUPPORT
 	bool "Discover board ID and store it in coreboot table"
 	default n
+	select GENERIC_GPIO_LIB
 	help
 	  If enabled, coreboot discovers the board id of the hardware it is
 	  running on and reports it through the coreboot table to the rest of
 	  the system.
 
-config TERTIARY_BOARD_ID
-	bool "Interpret board ID GPIOs as tertiary inputs"
-	default n
-	depends on BOARD_ID_SUPPORT
-	help
-	  Consider each GPIO as being in one of three states: pulled down (0),
-	  pulled up (1), or not connected (2)
-
 endmenu
 
 # These probably belong somewhere else, but they are needed somewhere.

src/lib/Makefile.inc

@@ -92,7 +92,7 @@ ramstage-$(CONFIG_MAINBOARD_DO_NATIVE_VGA_INIT) += edid.c
 ramstage-y += memrange.c
 ramstage-$(CONFIG_COOP_MULTITASKING) += thread.c
 ramstage-$(CONFIG_TIMER_QUEUE) += timer_queue.c
-ramstage-$(CONFIG_TERTIARY_BOARD_ID) += gpio.c
+ramstage-$(CONFIG_GENERIC_GPIO_LIB) += gpio.c
 ramstage-$(CONFIG_GENERIC_UDELAY) += timer.c
 
 romstage-y += cbmem_common.c dynamic_cbmem.c

src/mainboard/google/nyan_big/Kconfig

@@ -34,7 +34,6 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select SPI_FLASH
 	select SPI_FLASH_FAST_READ_DUAL_OUTPUT_3B
 	select VIRTUAL_DEV_SWITCH
-	select TERTIARY_BOARD_ID
 
 config MAINBOARD_DIR
 	string

src/mainboard/google/nyan_blaze/Kconfig

@@ -34,7 +34,6 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select BOARD_ROMSIZE_KB_1024
 	select SPI_FLASH
 	select SPI_FLASH_FAST_READ_DUAL_OUTPUT_3B
-	select TERTIARY_BOARD_ID
 	select VIRTUAL_DEV_SWITCH
 
 config MAINBOARD_DIR

src/mainboard/google/rush_ryu/Kconfig

@@ -31,7 +31,6 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select MAINBOARD_HAS_BOOTBLOCK_INIT
 	select BOARD_ROMSIZE_KB_4096
 	select VIRTUAL_DEV_SWITCH
-	select TERTIARY_BOARD_ID
 	select ARCH_SPINTABLE
 
 config MAINBOARD_DIR

src/mainboard/google/storm/Kconfig

@@ -28,7 +28,6 @@ config BOARD_SPECIFIC_OPTIONS
 	select MAINBOARD_HAS_BOOTBLOCK_INIT
 	select SPI_FLASH
 	select SPI_FLASH_SPANSION
-	select TERTIARY_BOARD_ID
 
 config BOARD_VARIANT_AP148
 	bool "pick this to build an image for ap148"