7 files changed, 61 insertions, 0 deletions
diff --git a/src/device/Makefile.inc b/src/device/Makefile.inc
index bb125afb8f..808648d4b4 100644
--- a/src/device/Makefile.inc
+++ b/src/device/Makefile.inc
@@ -63,3 +63,5 @@ ramstage-$(CONFIG_RESOURCE_ALLOCATOR_V3) += resource_allocator_v3.c
 ramstage-$(CONFIG_RESOURCE_ALLOCATOR_V4) += resource_allocator_v4.c
 
 ramstage-$(CONFIG_XHCI_UTILS) += xhci.c
+
+ramstage-y += gpio.c
diff --git a/src/device/device_const.c b/src/device/device_const.c
index 2dc583ca27..5288a743b6 100644
--- a/src/device/device_const.c
+++ b/src/device/device_const.c
@@ -162,6 +162,9 @@ static int path_eq(const struct device_path *path1,
 	case DEVICE_PATH_LPC:
 		equal = (path1->lpc.addr == path2->lpc.addr);
 		break;
+	case DEVICE_PATH_GPIO:
+		equal = (path1->gpio.id == path2->gpio.id);
+		break;
 	default:
 		printk(BIOS_ERR, "Unknown device type: %d\n", path1->type);
 		break;
diff --git a/src/device/device_util.c b/src/device/device_util.c
index 452a87bf14..0bce26a99e 100644
--- a/src/device/device_util.c
+++ b/src/device/device_util.c
@@ -130,6 +130,9 @@ u32 dev_path_encode(const struct device *dev)
 	case DEVICE_PATH_USB:
 		ret |= dev->path.usb.port_type << 8 | dev->path.usb.port_id;
 		break;
+	case DEVICE_PATH_GPIO:
+		ret |= dev->path.gpio.id;
+		break;
 	case DEVICE_PATH_NONE:
 	case DEVICE_PATH_MMIO:  /* don't care */
 	default:
@@ -223,6 +226,9 @@ const char *dev_path(const struct device *dev)
 			snprintf(buffer, sizeof(buffer), "LPC: %08lx",
 				 dev->path.lpc.addr);
 			break;
+		case DEVICE_PATH_GPIO:
+			snprintf(buffer, sizeof(buffer), "GPIO: %d", dev->path.gpio.id);
+			break;
 		default:
 			printk(BIOS_ERR, "Unknown device path type: %d\n",
 			       dev->path.type);
diff --git a/src/device/gpio.c b/src/device/gpio.c
new file mode 100644
index 0000000000..5e71497024
--- /dev/null
+++ b/src/device/gpio.c
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <console/console.h>
+#include <device/device.h>
+#include <device/gpio.h>
+
+const struct gpio_operations *dev_get_gpio_ops(struct device *dev)
+{
+	if (!dev) {
+		printk(BIOS_ERR, "Could not get gpio operations, device is NULL.");
+		return NULL;
+	} else if (!dev->ops) {
+		printk(BIOS_ERR, "Could not get gpio operations, dev->ops is NULL.");
+		return NULL;
+	} else if (!dev->ops->ops_gpio) {
+		printk(BIOS_ERR, "Could not get gpio operations, ops_gpio is NULL.");
+		return NULL;
+	}
+
+	return dev->ops->ops_gpio;
+}
diff --git a/src/include/device/device.h b/src/include/device/device.h
index 786a640f39..d83cfe4075 100644
--- a/src/include/device/device.h
+++ b/src/include/device/device.h
@@ -16,6 +16,7 @@ struct smbus_bus_operations;
 struct pnp_mode_ops;
 struct spi_bus_operations;
 struct usb_bus_operations;
+struct gpio_operations;
 
 /* Chip operations */
 struct chip_operations {
@@ -62,6 +63,7 @@ struct device_operations {
 	const struct spi_bus_operations *ops_spi_bus;
 	const struct smbus_bus_operations *ops_smbus_bus;
 	const struct pnp_mode_ops *ops_pnp_mode;
+	const struct gpio_operations *ops_gpio;
 };
 
 /**
diff --git a/src/include/device/gpio.h b/src/include/device/gpio.h
new file mode 100644
index 0000000000..67975b3c45
--- /dev/null
+++ b/src/include/device/gpio.h
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __DEVICE_GPIO_H__
+#define __DEVICE_GPIO_H__
+
+#include <types.h>
+
+struct gpio_operations {
+	int  (*get)(uint32_t gpio);
+	void (*set)(uint32_t gpio, int value);
+	void (*input_pulldown)(uint32_t gpio);
+	void (*input_pullup)(uint32_t gpio);
+	void (*input)(uint32_t gpio);
+	void (*output)(uint32_t gpio, int value);
+};
+
+/* Helper for getting gpio operations from a device */
+const struct gpio_operations *dev_get_gpio_ops(struct device *dev);
+
+#endif	/* __DEVICE_GPIO_H__ */
diff --git a/src/include/device/path.h b/src/include/device/path.h
index 5690badc4c..0cdb997726 100644
--- a/src/include/device/path.h
+++ b/src/include/device/path.h
@@ -21,6 +21,7 @@ enum device_path_type {
 	DEVICE_PATH_MMIO,
 	DEVICE_PATH_ESPI,
 	DEVICE_PATH_LPC,
+	DEVICE_PATH_GPIO,
 
 	/*
 	 * When adding path types to this table, please also update the
@@ -46,6 +47,7 @@ enum device_path_type {
 		"DEVICE_PATH_MMIO",		\
 		"DEVICE_PATH_ESPI",		\
 		"DEVICE_PATH_LPC",		\
+		"DEVICE_PATH_GPIO",		\
 }
 
 struct domain_path {
@@ -116,6 +118,10 @@ struct lpc_path {
 	uintptr_t addr;
 };
 
+struct gpio_path {
+	unsigned int id;
+};
+
 struct device_path {
 	enum device_path_type type;
 	union {
@@ -134,6 +140,7 @@ struct device_path {
 		struct mmio_path	mmio;
 		struct espi_path	espi;
 		struct lpc_path		lpc;
+		struct gpio_path	gpio;
 	};
 };