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The current simplify lpc32xx gpio driver implementation assume a
maximum of 32 GPIO per port; there are a total of 22 GPI, 24 GPO
and 6 GPIO to managed on port 3.
Update the driver to fix the following:
1) When requesting GPI_xx and GPO_xx on port 3 (xx is the same number)
the second call to "gpio_request" will return -EBUSY.
2) The status of GPO_xx pin report the status of the
corresponding GPI_xx pin when using the "gpio status" command.
3) The gpio driver may setup the direction register for the wrong
gpio when calling "gpio_direction_input" (GPI_xx) or
"gpio_direction_output" (GPO_xx) on port 3; the call to the
direction is require to use the "gpio status" command.
The following change were done in the driver:
1) port3 GPI are cache in a separate 32 bits in the array.
2) port3 direction register written only for GPIO pins.
3) port3 GPO & GPIO (as output) are read using "p3_outp_state".
4) LPC32XX_GPI_P3_GRP updated to match the change.
Signed-off-by: Sylvain Lemieux <slemieux@tycoint.com>
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