Change in coreboot[master]: drivers/i2c/tpm: Add irq_gpio support to tpm.

[Justin TerAvest (Code Review)]

Justin TerAvest has uploaded this change for review. ( https://review.coreboot.org/23500

Change subject: drivers/i2c/tpm: Add irq_gpio support to tpm.
......................................................................

drivers/i2c/tpm: Add irq_gpio support to tpm.

Grunt (a amd-stoneyridge based platform) uses a GPIO to interface with
the tpm. This change allows devicetree entries to use a irq_gpio entry
to describe the interface with the TPM.

BUG=b:72655090

Change-Id: I08289891408d7176f68eb9c67f7a417a2448c2de
Signed-off-by: Justin TerAvest 
---
M src/drivers/i2c/tpm/chip.c
M src/drivers/i2c/tpm/chip.h
2 files changed, 6 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/00/23500/1

diff --git a/src/drivers/i2c/tpm/chip.c b/src/drivers/i2c/tpm/chip.c
index 6d5c28a..2655b0d 100644
--- a/src/drivers/i2c/tpm/chip.c
+++ b/src/drivers/i2c/tpm/chip.c
@@ -55,7 +55,11 @@
    acpigen_write_name("_CRS");
    acpigen_write_resourcetemplate_header();
    acpi_device_write_i2c(&i2c);
-	acpi_device_write_interrupt(&config->irq);
+	if (config->irq_gpio.pin_count)
+		acpi_device_write_gpio(&config->irq_gpio);
+	else
+		acpi_device_write_interrupt(&config->irq);
+
    acpigen_write_resourcetemplate_footer();

acpigen_pop_len(); /* Device */
diff --git a/src/drivers/i2c/tpm/chip.h b/src/drivers/i2c/tpm/chip.h
index 5abd3a9..149627f 100644
--- a/src/drivers/i2c/tpm/chip.h
+++ b/src/drivers/i2c/tpm/chip.h
@@ -7,4 +7,5 @@
    unsigned int uid;	/* ACPI _UID */
    enum i2c_speed speed;	/* Bus speed in Hz, default is I2C_SPEED_FAST */
    struct acpi_irq irq;	/* Interrupt */
+	struct acpi_gpio irq_gpio;	/* GPIO interrupt */
 };