[coreboot-gerrit] Change in coreboot[master]: gpio: Add a function to get current output value of a GPIO.

[Marco Chen (Code Review)]

Hello Marco Chen,

I'd like you to do a code review. Please visit

https://review.coreboot.org/c/coreboot/+/34189

to review the following change.

Change subject: gpio: Add a function to get current output value of a GPIO.
......................................................................

gpio: Add a function to get current output value of a GPIO.

Add a new function - gpio_get_output() which can be implemented by
SoC/board code to provide the current output value of a GPIO.

If not implemented then the default handler will always return 0.

BUG=b:137033609
BRANCH=octopus
TEST=build octopus variants.

Change-Id: Iba67c8426f3049dc1ed0cdbb6561d9cb5ddb81d9
Signed-off-by: Marco Chen 
---
M src/include/gpio.h
M src/lib/gpio.c
2 files changed, 7 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/89/34189/1

diff --git a/src/include/gpio.h b/src/include/gpio.h
index 0a37ee7..a605f17 100644
--- a/src/include/gpio.h
+++ b/src/include/gpio.h
@@ -24,6 +24,7 @@

/* The following functions must be implemented by SoC/board code. */
 int gpio_get(gpio_t gpio);
+int gpio_get_output(gpio_t gpio);
 void gpio_set(gpio_t gpio, int value);
 void gpio_input_pulldown(gpio_t gpio);
 void gpio_input_pullup(gpio_t gpio);
diff --git a/src/lib/gpio.c b/src/lib/gpio.c
index 8ea3b5e..9e22b63 100644
--- a/src/lib/gpio.c
+++ b/src/lib/gpio.c
@@ -190,3 +190,9 @@
 {
    return 0;
 }
+
+/* Default handler returns 0 because type of gpio_t is unknown */
+__weak int gpio_get_output(gpio_t gpio)
+{
+	return 0;
+}