linux-phytec-ti

Input: matrix-keypad: Enhance pinctrl support

Update matrix-keypad driver to set the state of the pins to:
- "sleep" on suspend
- "default" on resume

By optionally putting the pins into sleep state in the suspend callback
we can accomplish two things.
- minimize current leakage from pins and thus save power,
- prevent the IP from driving pins output in an uncontrolled manner,
which may happen if the power domain drops the domain regulator.

When using any of the GPIOs in a matrix-keypad for wakeup the pins must
be set to the appropriate state to allow this dependent on the board.

Signed-off-by: Hebbar, Gururaja <gururaja.hebbar@ti.com>
Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>