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Matt DeVillier 037cc72e33 UPSTREAM: google/rambi: add explicit pull-down for ram-id 
Some variants need the internal pull resistor on GPIO_SSUS_40
set explicitly to pull down rather than disabling the pull,
in order for the ram-id to be read correctly via GPIO.

Correct this by adding a function to enable and set the internal pull
and define its use as needed in the board's variant.h.

Chromium source:
branch: firmware-gnawty-5216.239.B
/src/soc/intel/baytrail/baytrail/gpio.h#418
/src/mainboard/google/gnawty/romstage.c#60

Test: boot 4GB Candy board and observe correct RAM id, amount detected

BUG=none
BRANCH=none
TEST=none

Change-Id: Ia648846f4cdf65908db9a310b201562f0ff72951
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Original-Commit-Id: 474a7c51ce
Original-Change-Id: I8823c27385f4422184b5afa57f6048f7ff2a25ab
Original-Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Original-Reviewed-on: https://review.coreboot.org/18309
Original-Tested-by: build bot (Jenkins)
Original-Reviewed-by: Nico Huber <nico.h@gmx.de>
Original-Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: https://chromium-review.googlesource.com/443676
2017-02-17 04:09:18 -08:00
..
broadcom/cygnus UPSTREAM: spi: Get rid of SPI_ATOMIC_SEQUENCING 2017-01-05 11:00:04 -08:00
dmp/vortex86ex UPSTREAM: src/soc: Capitalize CPU, ACPI, RAM and ROM 2016-08-04 23:37:59 -07:00
imgtec/pistachio UPSTREAM: spi: Get rid of SPI_ATOMIC_SEQUENCING 2017-01-05 11:00:04 -08:00
intel UPSTREAM: google/rambi: add explicit pull-down for ram-id 2017-02-17 04:09:18 -08:00
lowrisc/lowrisc UPSTREAM: soc/lowrisc: Place CBMEM at top of autodetected RAM 2016-12-08 12:30:55 -08:00
marvell UPSTREAM: soc/marvell/mvmap2315: Mark mvmap2315_reset() as noreturn 2017-01-13 18:41:29 -08:00
mediatek/mt8173 various cleanups from upstream 2017-02-06 05:03:19 -08:00
nvidia UPSTREAM: spi: Define and use spi_ctrlr structure 2016-12-08 12:30:16 -08:00
qualcomm Gale: spi: add vector operation method 2017-02-03 17:52:18 -08:00
rdc/r8610 rdc/r8610: Move to src/soc 2016-05-05 20:08:58 +02:00
rockchip various cleanups from upstream 2017-02-06 05:03:19 -08:00
samsung UPSTREAM: samsung/exynos5420: Fix test for src < 0 2016-12-16 15:42:11 -08:00
ucb/riscv UPSTREAM: soc/ucb/riscv: Place CBMEM at top of autodetected RAM 2016-12-08 12:30:48 -08:00