mb/google/guybrush: Set eSPI alert as dedicated open drain
Guybrush based boards must usa a dedicated eSPI alert#.
Must be open drain to prevent power leaks.
Keep guybrush reference board in-band since alert# may not be connected.
BUG=b:198409370
TEST=Build guybrush and nipperkin, boot guybrush
BRANCH=None
Change-Id: I4b23bfc6a1167aebfde5acd524fda043b63163dc
Signed-off-by: Rob Barnes <robbarnes@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57313
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
diff --git a/src/mainboard/google/guybrush/variants/baseboard/devicetree.cb b/src/mainboard/google/guybrush/variants/baseboard/devicetree.cb
index df8bd2a..a0d5114 100644
--- a/src/mainboard/google/guybrush/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/guybrush/variants/baseboard/devicetree.cb
@@ -36,7 +36,7 @@
.io_mode = ESPI_IO_MODE_QUAD,
.op_freq_mhz = ESPI_OP_FREQ_33_MHZ,
.crc_check_enable = 1,
- .alert_pin = ESPI_ALERT_PIN_IN_BAND,
+ .alert_pin = ESPI_ALERT_PIN_OPEN_DRAIN,
.periph_ch_en = 1,
.vw_ch_en = 1,
.oob_ch_en = 0,