linux-kernel - Re: [PATCH 1/3] serial_core: Add helper for matching against linux,stdout-path

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Message-ID: <506F0E25.6080309@gmail.com>
Date:	Fri, 05 Oct 2012 11:43:17 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Sascha Hauer <s.hauer@...gutronix.de>
CC:	linux-serial@...r.kernel.org, Alan Cox <alan@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	linux-kernel@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/3] serial_core: Add helper for matching against linux,stdout-path

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@...gutronix.de>
> ---
>  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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