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cr50: Add pull down on UART TX signals

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We need to have an internal pull down so the UART TX signals will be
pulled low when servo is disconnected.

BUG=chrome-os-partner:54547
BRANCH=none
TEST=On gru test that servo detection works.

Change-Id: I7d549766273862eb23c0645b887f3db4a0adbab1
Signed-off-by: Mary Ruthven <mruthven@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/353764
Commit-Ready: Vadim Bendebury <vbendeb@chromium.org>
Tested-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
This commit is contained in:
Mary Ruthven
2016-06-17 17:09:51 -07:00
committed by chrome-bot
parent 2fce24ee7c
commit 268ca52daa
1 changed files with 9 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
board/cr50/gpio.inc
View File

@@ -15,15 +15,19 @@
* boards that don't have an external pullup don't trigger due to noise.
*/
GPIO_INT(SYS_RST_L_IN, PIN(1, 0), GPIO_INT_FALLING | GPIO_PULL_UP,
sys_rst_asserted)
sys_rst_asserted)
GPIO_INT(AP_ON, PIN(1, 1), GPIO_INT_RISING, device_state_on)
GPIO_INT(EC_ON, PIN(1, 2), GPIO_INT_RISING, device_state_on)
GPIO_INT(SERVO_UART1_ON, PIN(1, 3), GPIO_INT_RISING, device_state_on)
GPIO_INT(SERVO_UART2_ON, PIN(1, 4), GPIO_INT_RISING, device_state_on)
GPIO_INT(SERVO_UART1_ON, PIN(1, 3), GPIO_INT_RISING | GPIO_PULL_DOWN,
device_state_on)
GPIO_INT(SERVO_UART2_ON, PIN(1, 4), GPIO_INT_RISING | GPIO_PULL_DOWN,
device_state_on)
GPIO_INT(AP_OFF, PIN(1, 5), GPIO_INT_FALLING, device_state_off)
GPIO_INT(EC_OFF, PIN(1, 6), GPIO_INT_FALLING, device_state_off)
GPIO_INT(SERVO_UART1_OFF, PIN(1, 7), GPIO_INT_FALLING, device_state_off)
GPIO_INT(SERVO_UART2_OFF, PIN(1, 8), GPIO_INT_FALLING, device_state_off)
GPIO_INT(SERVO_UART1_OFF, PIN(1, 7), GPIO_INT_FALLING | GPIO_PULL_DOWN,
device_state_off)
GPIO_INT(SERVO_UART2_OFF, PIN(1, 8), GPIO_INT_FALLING | GPIO_PULL_DOWN,
device_state_off)
/* Pull this low to interrupt the AP */
GPIO(INT_AP_L, PIN(0, 0), GPIO_INPUT)