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arcada: add internal pull to ISH UART RX

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We do not want the RX signal to be floating on the board as that could
cause the ISH to remain in a higher power state (because there is logic
to keep the ISH in an higher power state when there is an active UART).

Add an internal 20K pull up on the RX line. In normal configuration this
will burn an additional 544uW.

BRANCH=R75
BUG=b:131241969
TEST=verify that ISH console still works with rework

Change-Id: Ifc9621bcafe4c86edfa9cd6d58b307254d3a81ca
Signed-off-by: Jett Rink <jettrink@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32471
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
This commit is contained in:
Jett Rink 2019-04-25 14:21:52 -06:00 committed by Patrick Georgi
parent 5806665059
commit c426be6ae2
1 changed files with 1 additions and 1 deletions
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src/mainboard/google/sarien/variants/arcada/gpio.c
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@ -123,7 +123,7 @@ static const struct pad_config gpio_table[] = {
/* ISH_SPI_MISO */ PAD_CFG_GPI(GPP_D11, NONE, DEEP), /* TBT_DET# */
/* ISH_SPI_MOSI */ PAD_NC(GPP_D12, NONE),
/* ISH_CPU_UART0_RX */
/* ISH_UART0_RXD */ PAD_CFG_NF(GPP_D13, NONE, DEEP, NF1),
/* ISH_UART0_RXD */ PAD_CFG_NF(GPP_D13, UP_20K, DEEP, NF1),
/* ISH_CPU_UART0_TX */
/* ISH_UART0_TXD */ PAD_CFG_NF(GPP_D14, NONE, DEEP, NF1),
/* ISH_UART0_RTS# */ PAD_CFG_GPO(GPP_D15, 1, DEEP), /* WWAN_FULL_PWR_EN */