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If there is a gpio range mapping for the pin, then print out the gpio chip and line index for the pin in the debugfs 'pins' file with the format: "[line-index]:[gpio-label]" Here is example output on the BeagleBoard.org PocketBeagle (AM3358): /sys/kernel/debug/pinctrl/44e10800.pinmux-pinctrl-single/pins pin 25 (PIN25) 25:gpio-32-63 44e10864 00000037 pinctrl-single pin 26 (PIN26) 26:gpio-32-63 44e10868 00000037 pinctrl-single pin 27 (PIN27) 27:gpio-32-63 44e1086c 00000037 pinctrl-single pin 28 (PIN28) 0:? 44e10870 00000036 pinctrl-single pin 29 (PIN29) 0:? 44e10874 00000006 pinctrl-single pin 30 (PIN30) 28:gpio-32-63 44e10878 00000027 pinctrl-single pin 31 (PIN31) 29:gpio-32-63 44e1087c 00000037 pinctrl-single pin 32 (PIN32) 30:gpio-32-63 44e10880 00000037 pinctrl-single pin 33 (PIN33) 31:gpio-32-63 44e10884 00000037 pinctrl-single pin 34 (PIN34) 0:gpio-64-95 44e10888 00000037 pinctrl-single pin 35 (PIN35) 1:gpio-64-95 44e1088c 00000037 pinctrl-single Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com> Suggested-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Drew Fustini <drew@beagleboard.org> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Link: https://lore.kernel.org/r/20200722122751.266440-1-drew@beagleboard.org Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.