Signed-off-by: Nicolas Saenz Julienne <nicolassaenzj@xxxxxxxxx>
---
Documentation/kernel-parameters.txt | 6 ++++++
drivers/tty/serial/meson_uart.c | 22 ++++++++++++++++++++++
2 files changed, 28 insertions(+)
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 551ecf0..1661af4 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1025,6 +1025,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
the driver will use only 32-bit accessors to read/write
the device registers.
+ meson,<addr>
+ Start an early, polled-mode console on an meson serial
+ port at the specified address. The serial port
+ must already be setup and configured. Options are not
+ yet supported.
+
msm_serial,<addr>
Start an early, polled-mode console on an msm serial
port at the specified address. The serial port
diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c
index b12a37b..f6ff2fa 100644
--- a/drivers/tty/serial/meson_uart.c
+++ b/drivers/tty/serial/meson_uart.c
@@ -548,6 +548,28 @@ static int __init meson_serial_console_init(void)
}
console_initcall(meson_serial_console_init);
+static void meson_early_console_write(struct console *con, const char *s,
+ unsigned n)
+{
+ struct earlycon_device *dev = con->data;
+
+ uart_console_write(&dev->port, s, n, meson_console_putchar);
+}
+
+static int __init meson_early_console_setup(struct earlycon_device *device,
+ const char *opt)
+{
+ if (!device->port.membase)
+ return -ENODEV;
+
+ device->con->write = meson_early_console_write;
+ return 0;
+}
+
+EARLYCON_DECLARE(meson, meson_early_console_setup);
+OF_EARLYCON_DECLARE(meson, "amlogic,meson-uart",
+ meson_early_console_setup);
+
#define MESON_SERIAL_CONSOLE (&meson_serial_console)
#else
#define MESON_SERIAL_CONSOLE NULL
--
2.5.0
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