On Mon, 8 Oct 2018 22:23:21 +0200, Lubomir Rintel wrote: > HiMax HX8837 is a display controller used on OLPC platforms. It controlls > backlight and is able to capture and freeze a frame when the LCD controller > (and the rest of the plaform) is powered off. > > This driver is based on the same code as drivers/staging/olpc_dcon. > I modernized it to use managed GPIO, device-tree bindings, sysfs attribtue > groups, essentially fixing the staging driver's TODO. > > Why I am not removing the staging driver now is because I've hobbled off > some functionality too (with an intent to bring add it back eventually): > > * I've removed parts that talk directly to the OLPC EC to turn off/on the > power. A separate patch will make the EC expose a regulator interface > that should be used instead. > > * Some work is likely needed to make XO 1 and XO 1.5 work. Both platforms > are DT-based and could use the same bindings, but I haven't checked > whether the cs5535 and vx855 GPIO drivers are good enough. > > What is there is the backlight control and the sysfs attributes to control > the freeze/unfreeze.. > > I've also renamed the driver to use the actual chip name instead of the > original name that I found too generic. This way the staging driver can be > used on XO 1 and XO 1.5 for the time being, while my XO 1.75 can utilize > this one. > > Signed-off-by: Lubomir Rintel <lkundrak@xxxxx> > --- > Changes since v1: > - Use interrupt bindings instead of gpio for the IRQ > - Update the statement on XO 1/1.5 support in the commit message > > drivers/misc/Kconfig | 16 + > drivers/misc/Makefile | 1 + > drivers/misc/hx8837.c | 741 ++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 758 insertions(+) > create mode 100644 drivers/misc/hx8837.c > Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
