drivers/i2c/generic: Allow mainboards to export reset and enable GPIOs

Add power management type config option that allows mainboards to
either:
1. Define a power resource that uses the reset and enable gpios to
power on and off the device using _ON and _OFF methods, or
2. Export reset and enable GPIOs in _CRS and _DSD so that the OS can
directly toggle the GPIOs as required.

GPIO type needs to be updated in drivers_i2c_generic_config to use
acpi_gpio type so that it can be used for both the above cases.

BUG=chrome-os-partner:60194
BRANCH=None
TEST=Verified that elan touchscreen works fine on reef using exported
GPIOs.

Change-Id: I4d76f193f615cfc4520869dedc55505c109042f6
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/17797
Tested-by: build bot (Jenkins)
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>

1 files changed, 10 insertions, 2 deletions

diff --git a/src/drivers/i2c/generic/chip.h b/src/drivers/i2c/generic/chip.h
index b1fc8e5946..19c6596db4 100644
--- a/src/drivers/i2c/generic/chip.h
+++ b/src/drivers/i2c/generic/chip.h
@@ -19,6 +19,11 @@
 #include <arch/acpi_device.h>
 #include <device/i2c.h>
 
+enum power_mgmt_type {
+	POWER_RESOURCE = 1,
+	GPIO_EXPORT = 2,
+};
+
 struct drivers_i2c_generic_config {
 	const char *hid;	/* ACPI _HID (required) */
 	const char *cid;	/* ACPI _CID */
@@ -42,12 +47,15 @@ struct drivers_i2c_generic_config {
 	unsigned device_present_gpio;
 	unsigned device_present_gpio_invert;
 
+	/* Power management type. */
+	enum power_mgmt_type pwr_mgmt_type;
+
 	/* GPIO used to take device out of reset or to put it into reset. */
-        unsigned reset_gpio;
+	struct acpi_gpio reset_gpio;
 	/* Delay to be inserted after device is taken out of reset. */
 	unsigned reset_delay_ms;
 	/* GPIO used to enable device. */
-	unsigned enable_gpio;
+	struct acpi_gpio enable_gpio;
 	/* Delay to be inserted after device is enabled. */
 	unsigned enable_delay_ms;
 };