gpio: exar: refactor the driver

From: Bartosz Golaszewski <[email protected]>

I just wanted to convert the driver to using simpler IDA API but ended up quickly converting it to using regmap. Unfortunately I don't have the HW to test it so marking the patches that introduce functional change as RFT and Cc'ing the original author.

v1 -> v2:
- add new regmap helper: regmap_assign_bits()
- fix lvl vs sel register access
- set value in direction_output callback

v2 -> v3:
- drop the regmap helper from series

Note: I didn't use the fancy method of offset calculation Andy and David suggested because this series broke the driver according to Jan - let's get it right before we modify it any more. I found a couple problems that could maybe cause the crash. Jan: could you give it another spin?

Bartosz Golaszewski (7):
gpio: exar: add a newline after the copyright notice
gpio: exar: include idr.h
gpio: exar: switch to a simpler IDA interface
gpio: exar: use a helper variable for &pdev->dev
gpio: exar: unduplicate address and offset computation
gpio: exar: switch to using regmap
gpio: exar: use devm action for freeing the IDA and drop remove()

 drivers/gpio/Kconfig     |   1 +
 drivers/gpio/gpio-exar.c | 154 +++++++++++++++++++--------------------
 2 files changed, 77 insertions(+), 78 deletions(-)

2.29.1

Sorry for the noise, I noticed that I included Mark again when I started sending this series.

Bartosz