Reuse the existing console write implementation for implementing
DT-based and command-line-based earlycon support.
Signed-off-by: Andreas Färber <afaerber@xxxxxxx>
---
Documentation/kernel-parameters.txt | 6 ++++++
drivers/tty/serial/meson_uart.c | 13 +++++++++++++
2 files changed, 19 insertions(+)
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 602065c..90801ac 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1030,6 +1030,12 @@ Such letter suffixes can also be entirely omitted.
the driver will use only 32-bit accessors to read/write
the device registers.
+ meson_serial,<addr>
+ Start an early, polled-mode console on a 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..6f89567 100644
--- a/drivers/tty/serial/meson_uart.c
+++ b/drivers/tty/serial/meson_uart.c
@@ -548,6 +548,19 @@ static int __init meson_serial_console_init(void)
}
console_initcall(meson_serial_console_init);
+static int __init
+meson_serial_early_console_setup(struct earlycon_device *device, const char *opt)
+{
+ if (!device->port.membase)
+ return -ENODEV;
+
+ device->con->write = meson_serial_console_write;
+ return 0;
+}
+EARLYCON_DECLARE(meson_serial, meson_serial_early_console_setup);
+OF_EARLYCON_DECLARE(meson_serial, "amlogic,meson-uart",
+ meson_serial_early_console_setup);
+
#define MESON_SERIAL_CONSOLE (&meson_serial_console)
#else
#define MESON_SERIAL_CONSOLE NULL
--
2.6.2
--
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