On 10/05/2012 11:12 AM, Sascha Hauer wrote:
> 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.
Consoles can be on devices other than uarts, so this should really be
of_device_is_stdout_path() and in the DT core.
>
> Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
> ---
> 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)
I know I said use struct device, but since only device_node ptr is
needed you should just use that. Then the function is usable if you only
have the device_node ptr.
> + 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);
Need an empty version for !CONFIG_OF?
Rob
> +
> #endif
>
> #endif /* LINUX_SERIAL_CORE_H */
>
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