[PATCH v3 0/4] gpio: driver for the RPi3 GPIO expander

On Tue, Jan 16, 2018 at 1:45 PM, Baruch Siach [off-list ref] wrote:

The Raspberry Pi 3 has a GPIO expander that controls, among others, the
activity LED, and the camera connector GPIOs. The GPIO expander on an I2C bus
that is not directly controlled from the ARM core. The VC4 firmware controls
the I2C bus, and allows the ARM core to set/get GPIO settings over its mailbox
interface.

This series adds support for the RPi3 expander.

The driver is ported from the downstream kernel at
https://github.com/raspberrypi/linux/, branch rpi-4.9.y.

Changes in v3:

  * Kconfig tweaks
  * Check rpi_exp_gpio_get_polarity() return value
  * Redundant header removal
  * Redundant platform_set_drvdata() call removal
  * Small coding style changes

All is looking pretty good. I see Rob had some last minute comments,
but please rebase and repost post v4.16-rc1 so we can get this merged,
we need to get this upstream.

Yours,
Linus Walleij