diff options
| author | Vic Yang <victoryang@chromium.org> | 2014-08-25 15:12:34 -0700 |
|---|---|---|
| committer | chrome-internal-fetch <chrome-internal-fetch@google.com> | 2014-08-26 21:02:49 +0000 |
| commit | b22c10ce2e5d8186cff4623dbf6fb18ee6a62017 (patch) | |
| tree | 3f2ef8edc81892b38e098be471f8355482d5786b /board | |
| parent | 687f9032d1a30455da1b86b8878e91127539be46 (diff) | |
| download | chrome-ec-b22c10ce2e5d8186cff4623dbf6fb18ee6a62017.tar.gz | |
ryu: gate SCL to PI3USB9281
As a short term workaround for the I2C problem of PI3USB9281, we're
gating its SCL input when it's not addressed. This workaround will be
removed once we have the silicon fix.
BUG=chrome-os-partner:31526
TEST=Sanity check on P0 boards.
BRANCH=None
Change-Id: I57daf25f2ad2d94ac7e4192050b4d6bbdae9d51d
Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/214064
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Diffstat (limited to 'board')
| -rw-r--r-- | board/ryu/board.h | 8 | ||||
| -rw-r--r-- | board/ryu/gpio.inc | 3 |
2 files changed, 11 insertions, 0 deletions
diff --git a/board/ryu/board.h b/board/ryu/board.h index ffeda6f743..768f71fb1e 100644 --- a/board/ryu/board.h +++ b/board/ryu/board.h @@ -35,6 +35,14 @@ #undef CONFIG_CONSOLE_CMDHELP #define CONFIG_INDUCTIVE_CHARGING +/* + * Pericom I2C workaround + * TODO(crosbug.com/p/31529): Remove this. + */ +#define CONFIG_I2C_SCL_GATE_PORT I2C_PORT_MASTER +#define CONFIG_I2C_SCL_GATE_ADDR 0x4a +#define CONFIG_I2C_SCL_GATE_GPIO GPIO_PERICOM_CLK_EN + /* Charging/Power configuration */ #undef CONFIG_BATTERY_RYU /* TODO implement */ #define CONFIG_BATTERY_BQ27541 diff --git a/board/ryu/gpio.inc b/board/ryu/gpio.inc index b7579ebdb3..979722b450 100644 --- a/board/ryu/gpio.inc +++ b/board/ryu/gpio.inc @@ -90,6 +90,9 @@ GPIO(MASTER_I2C_SDA, B, 9, GPIO_INPUT, NULL) GPIO(SLAVE_I2C_SCL, B, 10, GPIO_INPUT, NULL) GPIO(SLAVE_I2C_SDA, B, 11, GPIO_INPUT, NULL) +/* SCL gating for PI3USB9281 */ +GPIO(PERICOM_CLK_EN, C, 15, GPIO_OUT_LOW, NULL) + /* Case closed debugging. */ GPIO(PD_DISABLE_DEBUG, C, 5, GPIO_OUT_HIGH, NULL) GPIO(SPI_FLASH_NSS, B, 12, GPIO_INPUT, NULL) |