diff options
| author | Ting Shen <phoenixshen@google.com> | 2019-10-23 20:02:10 +0800 |
|---|---|---|
| committer | Commit Bot <commit-bot@chromium.org> | 2019-12-16 08:06:04 +0000 |
| commit | 7b61704fd1a09c5aae26f163e096d9695e479f21 (patch) | |
| tree | 2692c9bdf01c6a73625b46c3bc5092bbb9ffaf06 /board | |
| parent | 7c89289e32ba60dca6d00aca6827b6ebe82f87ba (diff) | |
| download | chrome-ec-7b61704fd1a09c5aae26f163e096d9695e479f21.tar.gz | |
i2c: add support for i2c bit-banging
Krane/Jacuzzi need a 100KHz SMBus port for battery, in addition to the
existing two i2c ports.
This CL adds a bit-bang driver that supports i2c/smbus bit-banging
through a set of pre-defined gpio pins.
BUG=b:138161741,b:138415463
TEST=On a reworked jacuzzi (battery i2c connected to other gpios),
1) `battery` shows reasonable output (this verifies i2c_readN,
i2c_read_string)
2) `i2cscan` works for port 3 (bitbang port)
3) `cutoff` (verifies i2c_writeN)
4) `i2ctest` stress test
BRANCH=master
Change-Id: I78020e5c51707c3d9f0fd54f2c299e2f29cabe2f
Signed-off-by: Ting Shen <phoenixshen@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1765110
Reviewed-by: Alexandru M Stan <amstan@chromium.org>
Commit-Queue: Ting Shen <phoenixshen@chromium.org>
Tested-by: Ting Shen <phoenixshen@chromium.org>
Diffstat (limited to 'board')
| -rw-r--r-- | board/host/gpio.inc | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/board/host/gpio.inc b/board/host/gpio.inc index 5a08172a07..c567aa0277 100644 --- a/board/host/gpio.inc +++ b/board/host/gpio.inc @@ -31,3 +31,6 @@ GPIO(BASE_CHG_VDD_EN, PIN(0, 12), 0) GPIO(SPI1_NSS, PIN(0, 13), GPIO_OUT_HIGH) GPIO(USB_C0_DISCHARGE, PIN(0, 15), 0) + +GPIO(I2C_SCL, PIN(0, 16), GPIO_INPUT) +GPIO(I2C_SDA, PIN(0, 17), GPIO_INPUT) |