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: I687877e5bb89679d0133bed24e2480216c384a1c
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/228322
Reviewed-by: Julius Werner <jwerner@chromium.org>

src/Kconfig

@@ -1070,22 +1070,23 @@ 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 thee 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

@@ -102,7 +102,7 @@ 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
 
 # The CBMEM implementations are chosen based on CONFIG_DYNAMIC_CBMEM.

src/mainboard/google/nyan_big/Kconfig

@@ -33,7 +33,6 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select SPI_FLASH
 	select SPI_FLASH_FAST_READ_DUAL_OUTPUT_3B
 	select TEGRA124_MODEL_CD570M
-	select TERTIARY_BOARD_ID
 	select VIRTUAL_DEV_SWITCH
 
 config MAINBOARD_DIR

src/mainboard/google/nyan_blaze/Kconfig

@@ -33,7 +33,6 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select MAINBOARD_DO_NATIVE_VGA_INIT
 	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

@@ -32,7 +32,6 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select SOC_NVIDIA_TEGRA132
 	select MAINBOARD_HAS_BOOTBLOCK_INIT
 	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 SOC_QC_IPQ806X
 	select SPI_FLASH
 	select SPI_FLASH_SPANSION
-	select TERTIARY_BOARD_ID
 
 config BOARD_VARIANT_AP148
 	bool "pick this to build an image for ap148"