console-server: Add UART Mux Support

This commit adds support for uart-muxes which can be controlled via
gpios.

Change-Id: I91a4de1962554adf4302a2a59d2b371f492dc21d
Signed-off-by: Alexander Hansen <alexander.hansen@9elements.com>
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>
diff --git a/console-mux.h b/console-mux.h
new file mode 100644
index 0000000..7b2942a
--- /dev/null
+++ b/console-mux.h
@@ -0,0 +1,26 @@
+/**
+ * Copyright © 2024 9elements
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+struct config;
+struct console;
+struct console_server;
+
+int console_server_mux_init(struct console_server *server);
+void console_server_mux_fini(struct console_server *server);
+int console_mux_init(struct console *console, struct config *config);
+int console_mux_activate(struct console *console);