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Subject[PATCH -next 04/12] of: earlycon: Add options string handling
Date
commit 7914a7c5651a5 ("of: support passing console options with
stdout-path") added options string support to the stdout-path property.

Handle the options string for earlycon as well.

Requires: "libfdt: Teach fdt_path_offset() about ':' path separator"
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
---
drivers/of/fdt.c | 8 ++++++--
drivers/tty/serial/earlycon.c | 9 +++++++--
include/linux/serial_core.h | 3 ++-
3 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 5b67c6a..bdb74a8 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -765,7 +765,7 @@ extern struct of_device_id __earlycon_of_table[];
int __init early_init_dt_scan_chosen_serial(void)
{
int offset;
- const char *p;
+ const char *p, *options;
int l;
const struct of_device_id *match = __earlycon_of_table;
const void *fdt = initial_boot_params;
@@ -782,6 +782,10 @@ int __init early_init_dt_scan_chosen_serial(void)
if (!p || !l)
return -ENOENT;

+ options = strchr(p, ':');
+ if (options)
+ options++;
+
/* Get the node specified by stdout-path */
offset = fdt_path_offset(fdt, p);
if (offset < 0)
@@ -798,7 +802,7 @@ int __init early_init_dt_scan_chosen_serial(void)
if (!addr)
return -ENXIO;

- of_setup_earlycon(addr, match);
+ of_setup_earlycon(addr, match, options);
return 0;
}
return -ENODEV;
diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
index 04aa22c..436ac88 100644
--- a/drivers/tty/serial/earlycon.c
+++ b/drivers/tty/serial/earlycon.c
@@ -218,7 +218,8 @@ static int __init param_setup_earlycon(char *buf)
early_param("earlycon", param_setup_earlycon);

int __init of_setup_earlycon(unsigned long addr,
- const struct of_device_id *match)
+ const struct of_device_id *match,
+ const char *options)
{
int err;
struct uart_port *port = &early_console_dev.port;
@@ -229,8 +230,12 @@ int __init of_setup_earlycon(unsigned long addr,
port->uartclk = BASE_BAUD * 16;
port->membase = earlycon_map(addr, SZ_4K);

+ if (options) {
+ strlcpy(early_console_dev.options, options,
+ sizeof(early_console_dev.options));
+ }
earlycon_init(&early_console_dev, match->name);
- err = setup(&early_console_dev, NULL);
+ err = setup(&early_console_dev, options);
if (err < 0)
return err;
if (!early_console_dev.con->write)
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index a2db5bd..ebbcd43 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -346,7 +346,8 @@ struct earlycon_id {

extern int setup_earlycon(char *buf);
extern int of_setup_earlycon(unsigned long addr,
- const struct of_device_id *match);
+ const struct of_device_id *match,
+ const char *options);

#define EARLYCON_DECLARE(_name, func) \
static const struct earlycon_id __earlycon_##_name \
--
2.3.1


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