acpi: Support generation of a scope

Add a function to write a scope to the generated ACPI code.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: Fix build failures on Sandbox]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/include/acpi/acpigen.h b/include/acpi/acpigen.h
index c6644bc..4a60612 100644
--- a/include/acpi/acpigen.h
+++ b/include/acpi/acpigen.h
@@ -31,6 +31,7 @@
 	DWORD_PREFIX		= 0x0c,
 	STRING_PREFIX		= 0x0d,
 	QWORD_PREFIX		= 0x0e,
+	SCOPE_OP		= 0x10,
 	BUFFER_OP		= 0x11,
 	PACKAGE_OP		= 0x12,
 	METHOD_OP		= 0x14,
@@ -262,6 +263,14 @@
 void acpigen_write_name(struct acpi_ctx *ctx, const char *namepath);
 
 /**
+ * acpigen_write_scope() - Write a scope
+ *
+ * @ctx: ACPI context pointer
+ * @scope: Scope to write (e.g. "\\_SB.ABCD")
+ */
+void acpigen_write_scope(struct acpi_ctx *ctx, const char *scope);
+
+/**
  * acpigen_write_uuid() - Write a UUID
  *
  * This writes out a UUID in the format used by ACPI, with a BUFFER_OP prefix.