New warning in gpiolib.c

[Phil Elwell <phil@xxxxxxxxxxxxxxx>]

Hi,

While running the latest 6.14 release candidate I noticed lot of log
spam such as this:

[    1.315766] gpio gpiochip0: gpiochip_add_data_with_key:
get_direction failed: -22

It appears to have been added recently, with the intention that this
will eventually become a fatal error once all GPIO drivers have been
"fixed". However, I think the error return here can be appropriate and
useful.

The GPIO API is lacking a "none of the above" direction, for use with
pins which can be configured for alternate functions (UART, I2C, SPI,
etc.). Is it considered preferable to lie in such situations and say
that the pin is an input? If so, wouldn't that make it impossible to
detect the genuinely invalid (as far as the API is concerned) case of
querying the value of a pin without first making it an input?

Thanks,

Phil