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Commit 4d118c9a authored by Peter Hurley's avatar Peter Hurley Committed by Greg Kroah-Hartman
Browse files

of: earlycon: Add options string handling 



Pass-through any options string in the 'stdout-path' property to the
earlycon "driver" setup.

Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarPeter Hurley <peter@hurleysoftware.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 05d96132

drivers/of/fdt.c

+6 −5
Original line number Diff line number Diff line
@@ -800,7 +800,7 @@ static inline void early_init_dt_check_for_initrd(unsigned long node) 
static int __init early_init_dt_scan_chosen_serial(void)

{

	int offset;

	const char *p;

	const char *p, *q, *options = NULL;

	int l;

	const struct earlycon_id *match;

	const void *fdt = initial_boot_params;
@@ -817,11 +817,12 @@ static int __init early_init_dt_scan_chosen_serial(void) 
	if (!p || !l)

		return -ENOENT;



	/* Remove console options if present */

	l = strchrnul(p, ':') - p;

	q = strchrnul(p, ':');

	if (*q != '\0')

		options = q + 1;



	/* Get the node specified by stdout-path */

	offset = fdt_path_offset_namelen(fdt, p, l);

	offset = fdt_path_offset_namelen(fdt, p, q - p);

	if (offset < 0)

		return -ENODEV;
@@ -838,7 +839,7 @@ static int __init early_init_dt_scan_chosen_serial(void) 
		if (addr == OF_BAD_ADDR)

			return -ENXIO;



		of_setup_earlycon(addr, match);

		of_setup_earlycon(addr, match, options);

		return 0;

	}

	return -ENODEV;

drivers/tty/serial/earlycon.c

+7 −2
Original line number Diff line number Diff line
@@ -218,7 +218,8 @@ early_param("earlycon", param_setup_earlycon); 
#ifdef CONFIG_OF_EARLY_FLATTREE



int __init of_setup_earlycon(unsigned long addr,

			     const struct earlycon_id *match)

			     const struct earlycon_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 = match->setup(&early_console_dev, NULL);

	err = match->setup(&early_console_dev, options);

	if (err < 0)

		return err;

	if (!early_console_dev.con->write)

include/linux/serial_core.h

+2 −1
Original line number Diff line number Diff line
@@ -359,7 +359,8 @@ extern const struct earlycon_id __earlycon_table_end[]; 
#define EARLYCON_DECLARE(_name, fn)	OF_EARLYCON_DECLARE(_name, "", fn)



extern int setup_earlycon(char *buf);

extern int of_setup_earlycon(unsigned long addr, const struct earlycon_id *match);

extern int of_setup_earlycon(unsigned long addr, const struct earlycon_id *match,

			     const char *options);



struct uart_port *uart_get_console(struct uart_port *ports, int nr,

				   struct console *c);