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gpio: mockup: Adjust documentation to the code

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First of all one of the parameter missed 'mockup' in its name,
Second, the semantics of the integer pairs depends on the sign
of the base (the first value in the pair).

Update documentation to reflect the real code behaviour.

Fixes: 2fd1abe99e ("Documentation: gpio: add documentation for gpio-mockup")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
This commit is contained in:
Andy Shevchenko 2021-03-15 18:59:40 +02:00 committed by Bartosz Golaszewski
parent e5391a02bc
commit 81dd500b1c
1 changed files with 6 additions and 5 deletions
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11
Documentation/admin-guide/gpio/gpio-mockup.rst
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@ -17,17 +17,18 @@ module.
gpio_mockup_ranges
This parameter takes an argument in the form of an array of integer
pairs. Each pair defines the base GPIO number (if any) and the number
of lines exposed by the chip. If the base GPIO is -1, the gpiolib
will assign it automatically.
pairs. Each pair defines the base GPIO number (non-negative integer)
and the first number after the last of this chip. If the base GPIO
is -1, the gpiolib will assign it automatically. while the following
parameter is the number of lines exposed by the chip.
Example: gpio_mockup_ranges=-1,8,-1,16,405,4
Example: gpio_mockup_ranges=-1,8,-1,16,405,409
The line above creates three chips. The first one will expose 8 lines,
the second 16 and the third 4. The base GPIO for the third chip is set
to 405 while for two first chips it will be assigned automatically.
gpio_named_lines
gpio_mockup_named_lines
This parameter doesn't take any arguments. It lets the driver know that
GPIO lines exposed by it should be named.