cheza: Enable AP_RST_REQ as a request from AP to reset itself

This makes the EC listen to the AP_RST_REQ GPIO from AP. The rising
edge interrupts to trigger a hook to call chipset_reset().

As the hook task will be preempted by the chipset task, it adds a
flag bypass_power_lost_trigger to avoid triggering to S5 as the
chipset state machines sees power lost during the reset.

So far the chipset_reset() implementation is to do a cold reset;
will be revised to a warm reset after the PMIC registers are
reprogrammed.

BRANCH=none
BUG=b:74395451
TEST=make buildall -j
TEST=Ran 'reboot' on AP console which toggles the GPIO.

Change-Id: I946cb029541ce018a8ed1ce25681d38998a7f4b6
Signed-off-by: Wai-Hong Tam <waihong@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1023986
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/include/chipset.h b/include/chipset.h
index ba78c45397..85d33425f8 100644
--- a/include/chipset.h
+++ b/include/chipset.h
@@ -121,4 +121,12 @@ int chipset_pltrst_is_valid(void) __attribute__((weak));
  * Execute chipset-specific reboot.
  */
 void chipset_handle_reboot(void);
+
+/**
+ * GPIO interrupt handler of reset request from AP.
+ *
+ * It is used in SDM845 chipset power sequence.
+ */
+void chipset_reset_request_interrupt(enum gpio_signal signal);
+
 #endif  /* __CROS_EC_CHIPSET_H */