[PATCH v2 00/17] new locomo driver set

[dbaryshkov@gmail.com (Dmitry Eremin-Solenikov)]

Sharp Zaurus SL-5500 and SL-5600 use special companion Gate Array.
With this patchset I tried to modernise and restructure the LoCoMo drivers.

* Use platform bus and mfd core code
* Use GPIO API instead of custom locomo GPIO code
* Use irqdomains to manage IRQs
* Split mixed locomolcd driver to lcd and backlight parts
* Implement IRQ handling in GPIO driver
* Implement SPI driver used as a host for mmc_spi device to control SD cards

V1 was submitted about a half of a year ago. Major changes:
* Use gpiod_* in most of places
* Use regmap for accessing registers instead of manual RMW cycles
* Split dac driver from core module to i2c bus and separate IIO driver
* Replaced mdelay() calls with usleep_range or msleep where it was suitable
* Rewrote SPI driver to use core transfer_one() interface