acpi: Add support for SSDT generation

Some devices need to generate code for the Secondary System Descriptor
Table (SSDT). Add a method to handle this.

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>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/core/acpi.c b/drivers/core/acpi.c
index 8ae6157..4497b5c 100644
--- a/drivers/core/acpi.c
+++ b/drivers/core/acpi.c
@@ -18,6 +18,7 @@
 /* Type of method to call */
 enum method_t {
 	METHOD_WRITE_TABLES,
+	METHOD_FILL_SSDT,
 };
 
 /* Prototype for all methods */
@@ -51,6 +52,8 @@ acpi_method acpi_get_method(struct udevice *dev, enum method_t method)
 		switch (method) {
 		case METHOD_WRITE_TABLES:
 			return aops->write_tables;
+		case METHOD_FILL_SSDT:
+			return aops->fill_ssdt;
 		}
 	}
 
@@ -84,6 +87,17 @@ int acpi_recurse_method(struct acpi_ctx *ctx, struct udevice *parent,
 	return 0;
 }
 
+int acpi_fill_ssdt(struct acpi_ctx *ctx)
+{
+	int ret;
+
+	log_debug("Writing SSDT tables\n");
+	ret = acpi_recurse_method(ctx, dm_root(), METHOD_FILL_SSDT);
+	log_debug("Writing SSDT finished, err=%d\n", ret);
+
+	return ret;
+}
+
 int acpi_write_dev_tables(struct acpi_ctx *ctx)
 {
 	int ret;