acpi_device: Provide a new function to add a list of properties

Provide a new function that will allow adding arbitrary properties
to devicetree entries without needing a custom driver for the device.

This will allow the 'generic i2c' driver to support kernel drivers
that need additional device properties exposed and have those board
specific properties set with values from devicetree.

BUG=b:63413023
TEST=not used yet, compiles cleanly

Change-Id: Id272256639a8525406635e168a3db5ab1ba4df6b
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/21269
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/arch/x86/acpi_device.c

@@ -26,29 +26,6 @@
 #define ACPI_DP_UUID		"daffd814-6eba-4d8c-8a91-bc9bbf4aa301"
 #define ACPI_DP_CHILD_UUID	"dbb8e3e6-5886-4ba6-8795-1319f52a966b"
 
-enum acpi_dp_type {
-	ACPI_DP_TYPE_INTEGER,
-	ACPI_DP_TYPE_STRING,
-	ACPI_DP_TYPE_REFERENCE,
-	ACPI_DP_TYPE_TABLE,
-	ACPI_DP_TYPE_ARRAY,
-	ACPI_DP_TYPE_CHILD,
-};
-
-struct acpi_dp {
-	enum acpi_dp_type type;
-	const char *name;
-	struct acpi_dp *next;
-	union {
-		struct acpi_dp *child;
-		struct acpi_dp *array;
-	};
-	union {
-		uint64_t integer;
-		const char *string;
-	};
-};
-
 /* Write empty word value and return pointer to it */
 static void *acpi_device_write_zero_len(void)
 {
@@ -705,6 +682,45 @@ struct acpi_dp *acpi_dp_new_table(const char *name)
 	return acpi_dp_new(NULL, ACPI_DP_TYPE_TABLE, name);
 }
 
+size_t acpi_dp_add_property_list(struct acpi_dp *dp,
+				 const struct acpi_dp *property_list,
+				 size_t property_count)
+{
+	const struct acpi_dp *prop;
+	size_t i, properties_added = 0;
+
+	for (i = 0; i < property_count; i++) {
+		prop = &property_list[i];
+
+		if (prop->type == ACPI_DP_TYPE_UNKNOWN || !prop->name)
+			continue;
+
+		switch (prop->type) {
+		case ACPI_DP_TYPE_INTEGER:
+			acpi_dp_add_integer(dp, prop->name, prop->integer);
+			break;
+		case ACPI_DP_TYPE_STRING:
+			acpi_dp_add_string(dp, prop->name, prop->string);
+			break;
+		case ACPI_DP_TYPE_REFERENCE:
+			acpi_dp_add_reference(dp, prop->name, prop->string);
+			break;
+		case ACPI_DP_TYPE_ARRAY:
+			acpi_dp_add_array(dp, prop->array);
+			break;
+		case ACPI_DP_TYPE_CHILD:
+			acpi_dp_add_child(dp, prop->name, prop->child);
+			break;
+		default:
+			continue;
+		}
+
+		++properties_added;
+	}
+
+	return properties_added;
+}
+
 struct acpi_dp *acpi_dp_add_integer(struct acpi_dp *dp, const char *name,
 				    uint64_t value)
 {

src/arch/x86/include/arch/acpi_device.h

@@ -20,6 +20,30 @@
 #include <stdint.h>
 #include <spi-generic.h>
 
+enum acpi_dp_type {
+	ACPI_DP_TYPE_UNKNOWN,
+	ACPI_DP_TYPE_INTEGER,
+	ACPI_DP_TYPE_STRING,
+	ACPI_DP_TYPE_REFERENCE,
+	ACPI_DP_TYPE_TABLE,
+	ACPI_DP_TYPE_ARRAY,
+	ACPI_DP_TYPE_CHILD,
+};
+
+struct acpi_dp {
+	enum acpi_dp_type type;
+	const char *name;
+	struct acpi_dp *next;
+	union {
+		struct acpi_dp *child;
+		struct acpi_dp *array;
+	};
+	union {
+		uint64_t integer;
+		const char *string;
+	};
+};
+
 #define ACPI_DESCRIPTOR_LARGE		(1 << 7)
 #define ACPI_DESCRIPTOR_INTERRUPT	(ACPI_DESCRIPTOR_LARGE | 9)
 #define ACPI_DESCRIPTOR_GPIO		(ACPI_DESCRIPTOR_LARGE | 12)
@@ -337,8 +361,6 @@ void acpi_device_add_power_res(
  * }
  */
 
-struct acpi_dp;
-
 /* Start a new Device Property table with provided ACPI reference */
 struct acpi_dp *acpi_dp_new_table(const char *ref);
 
@@ -370,6 +392,11 @@ struct acpi_dp *acpi_dp_add_gpio(struct acpi_dp *dp, const char *name,
 struct acpi_dp *acpi_dp_add_child(struct acpi_dp *dp, const char *name,
 				  struct acpi_dp *child);
 
+/* Add a list of Device Properties, returns the number of properties added */
+size_t acpi_dp_add_property_list(struct acpi_dp *dp,
+				 const struct acpi_dp *property_list,
+				 size_t property_count);
+
 /* Write Device Property hierarchy and clean up resources */
 void acpi_dp_write(struct acpi_dp *table);