1 files changed, 22 insertions, 0 deletions

diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index f729be981da0..5bbb809ee197 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -285,6 +285,28 @@ static inline int uart_poll_timeout(struct uart_port *port)
 /*
  * Console helpers.
  */
+struct earlycon_device {
+        struct console *con;
+        struct uart_port port;
+        char options[16];               /* e.g., 115200n8 */
+        unsigned int baud;
+};
+int setup_earlycon(char *buf, const char *match,
+                   int (*setup)(struct earlycon_device *, const char *));
+
+extern int of_setup_earlycon(unsigned long addr,
+                             int (*setup)(struct earlycon_device *, const char *));
+
+#define EARLYCON_DECLARE(name, func) \
+static int __init name ## _setup_earlycon(char *buf) \
+{ \
+        return setup_earlycon(buf, __stringify(name), func); \
+} \
+early_param("earlycon", name ## _setup_earlycon);
+
+#define OF_EARLYCON_DECLARE(name, compat, fn)                           \
+        _OF_DECLARE(earlycon, name, compat, fn, void *)
+
 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
                                    struct console *c);
 void uart_parse_options(char *options, int *baud, int *parity, int *bits,