devicetrees may have a linux,stdout-path property in the chosen node describing the console device. This adds a helper function to match a device against this property so a driver can call add_preferred_console for a matching device.
Signed-off-by: Sascha Hauer <[email protected]> --- drivers/tty/serial/serial_core.c | 30 ++++++++++++++++++++++++++++++ include/linux/serial_core.h | 3 +++ 2 files changed, 33 insertions(+) diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index a21dc8e..f4a9f26 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -33,6 +33,7 @@ #include <linux/serial_core.h> #include <linux/delay.h> #include <linux/mutex.h> +#include <linux/of.h> #include <asm/irq.h> #include <asm/uaccess.h> @@ -2540,6 +2541,35 @@ void uart_insert_char(struct uart_port *port, unsigned int status, } EXPORT_SYMBOL_GPL(uart_insert_char); +#ifdef CONFIG_OF +/** + * of_uart_is_stdoutpath - check if this device matches the linux,stdout-path + * property + * + * Check if this device matches the linux,stdout-path property + * in the chosen node. return true if yes, false otherwise. + */ +int of_uart_is_stdoutpath(struct device *dev) +{ + struct device_node *dn; + const char *name; + + name = of_get_property(of_chosen, "linux,stdout-path", NULL); + if (name == NULL) + return 0; + + dn = of_find_node_by_path(name); + if (!dn) + return 0; + + if (dn == dev->of_node) + return 1; + + return 0; +} +EXPORT_SYMBOL_GPL(of_uart_is_stdoutpath); +#endif + EXPORT_SYMBOL(uart_write_wakeup); EXPORT_SYMBOL(uart_register_driver); EXPORT_SYMBOL(uart_unregister_driver); diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index 0253c20..35a61f6 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -560,6 +560,9 @@ static inline int uart_handle_break(struct uart_port *port) (cflag) & CRTSCTS || \ !((cflag) & CLOCAL)) +/* check if a device matches the linux,stdout-path property */ +int of_uart_is_stdoutpath(struct device *dev); + #endif #endif /* LINUX_SERIAL_CORE_H */ -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
