On Mon, Sep 21, 2015 at 06:09:15PM -0700, Linus Walleij wrote: > On Fri, Aug 14, 2015 at 7:11 AM, Markus Pargmann <m...@pengutronix.de> wrote: > > > Signed-off-by: Markus Pargmann <m...@pengutronix.de> > > This has too terse commit description. I don't understand the patch or > what it is supposed to do.
Sorry, indeed, this requires a commit description. I would add something like this: In '/sys/class/gpio/' GPIOs can be exported by using their GPIO number. If the exported GPIO has a name, it will show up as a new directory in '/sys/class/gpio/<GPIO_NAME>'. It is somehow inconsistent to use a number for exporting and the name for accessing the GPIO. This patch adds the possibility to use the GPIO name to export it. This introduces a consistent behaviour for exporting and accessing a GPIO from userspace. The mechanism of parsing the GPIO name is a fallback mechanism. This ensures backwards compatibility of the gpio interface. If the string passed to '/sys/class/gpio/export' can not be parsed as number, it tries to match a GPIO name. The same behaviour is implemented for the 'unexport' file. The implementation uses the previously defined gpio_name_to_desc(). Thanks, Markus -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
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