gpio: rcar: Optimize GPIO pin state read on R-Car Gen3

Currently, the R-Car GPIO driver treats R-Car Gen2 and R-Car Gen3 GPIO
controllers the same.  However, there exist small differences, like the
behavior of the General Input Register (INDT):
  - On R-Car Gen1, R-Car Gen2, and RZ/G1, INDT only reflects the state
    of an input pin if the GPIO is configured for input,
  - On R-Car Gen3 and RZ/G2, INDT always reflects the state of the input
    pins.
Hence to accommodate all variants, the driver does not use the INDT
register to read the status of a GPIO line when configured for output,
at the expense of doing 2 or 3 register reads instead of 1.

Given register accesses are slow, change the .get() and .get_multiple()
callbacks to always use INDT to read pin state on SoCs where this is
supported.

Signed-off-by: Geert Uytterhoeven <[email protected]>
Reviewed-by: Yoshihiro Shimoda <[email protected]>
Tested-by: Wolfram Sang <[email protected]>
Reviewed-by: Linus Walleij <[email protected]>
Signed-off-by: Bartosz Golaszewski <[email protected]>

0 files changed, 0 insertions, 0 deletions