[PATCH v2] Add some help using the gpio commands at runtime

[Sascha Hauer]

On Fri, Oct 22, 2010 at 03:24:00PM +0200, Juergen Beisert wrote:
> From: Juergen Beisert <jbe at pengutronix.de>
> Subject: [PATCH] Add some help using the gpio commands at runtime
> 
> Last time I used the gpio commands I was somehow confused about the behaviour
> of the 'gpio_get_value' command. So, I decided to add some doc for it. Here's
> the result.
> 
> Signed-off-by: Juergen Beisert <jbe at pengutronix.de>
> 
> ---
>  Documentation/commands.dox |    1 
>  commands/gpio.c            |   61 
> +++++++++++++++++++++++++++++++++++++++++++++

Your mailer breaks lines. (Fixed while applying)

Sascha


>  2 files changed, 62 insertions(+)
> 
> Index: barebox-2010.10.0/Documentation/commands.dox
> ===================================================================
> --- barebox-2010.10.0.orig/Documentation/commands.dox
> +++ barebox-2010.10.0/Documentation/commands.dox
> @@ -10,6 +10,7 @@
>  @li @subpage edit_command
>  @li @subpage erase_command
>  @li @subpage export_command
> + at li @subpage gpio_for_users
>  @li @subpage tftp_command
>  @li @subpage loadenv_command
>  @li @subpage mount_command
> Index: barebox-2010.10.0/commands/gpio.c
> ===================================================================
> --- barebox-2010.10.0.orig/commands/gpio.c
> +++ barebox-2010.10.0/commands/gpio.c
> @@ -120,3 +120,64 @@ BAREBOX_CMD_START(gpio_direction_output)
>  	BAREBOX_CMD_HELP(cmd_gpio_direction_output_help)
>  BAREBOX_CMD_END
>  
> +/**
> + at page gpio_for_users Runtime GPIO handling
> +
> + at section regular_gpio General usage information
> +
> +These commands are available if the symbol @b CONFIG_GENERIC_GPIO and
> + at b CONFIG_CMD_GPIO are enabled in the Kconfig.
> +
> + at note All gpio related commands take a number to identify the pad. This
> +number is architecture dependent. There may be no intuitional correlation
> +between available pads and the GPIO numbers to be used in the commands. Due
> +to this it's also possible the numbers change between @b barebox releases.
> +
> + at section gpio_dir_out Switch a pad into an output GPIO
> + at verbatim
> +gpio_direction_output <gpio_no> <initial_value>
> + at endverbatim
> +- @b gpio_no Architecture dependent GPIO number
> +- @b initial_value Output value the pad should emit
> +
> + at note To avoid glitches on the pad's line, the routines will first setting up
> +the pad's value and after that switching the pad itself to output (if the
> +silicon is able to do so)
> +
> + at note If the pad is already configured into a non GPIO mode (if available)
> +this command may fail (silently)
> +
> + at section gpio_dir_in Switch a pad into an input GPIO
> + at verbatim
> +gpio_direction_input <gpio_no>
> + at endverbatim
> +- @b gpio_no Architecture dependent GPIO number
> +
> + at note If the pad is already configured into a non GPIO mode (if available)
> +this command may fail (silently)
> +
> + at section gpio_get_value Read in the value of an GPIO input pad
> + at verbatim
> +gpio_get_value <gpio_no>
> + at endverbatim
> +
> +Reads in the current pad's line value from the given GPIO number. It returns
> +the value as a shell return code. There is no visible output at stdout. You
> +can check the return value by using "echo $?"
> +
> + at note If the return code is not '0' or '1' it's meant as an error code.
> +
> + at note If the pad is not configured for GPIO mode this command may fail
> +(silently) and returns garbage
> +
> + at section gpio_set_value Set a new value to a GPIO output pad
> + at verbatim
> +gpio_set_value <gpio_no> <value>
> + at endverbatim
> +- @b gpio_no Architecture dependent GPIO number
> +- @b value Output value the pad should emit
> +
> +Sets a new output @b value to the pad with GPIO number @b gpio_no
> +
> + at note If the pad is not configured for GPIO mode this command may fail 
> (silently)
> +*/
> 
> 
> 
> -- 
> Pengutronix e.K.                              | Juergen Beisert             |
> Linux Solutions for Science and Industry      | Phone: +49-8766-939 228     |
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> 
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