Re: i.MX27 SLCDC driver

On Fri, Aug 17, 2012 at 2:07 AM, Gaëtan Carlier [off-list ref] wrote:

Hello,
I would like to write the driver for SmartLCD controller of i.MX27. This
kind of interface needs a LCD with an embedded graphic controller partially
controlled by GPIO. I want to link it with an OLED DD12832.

How have I to write this driver : One driver for SLCDC and one driver for
DD12832 ? How to link them together ?

Maybe use similar philosophy than soc-camera ?

Please use DRM if you can. That way your SLCDC controller is a "crtc"
and your OLED panel is a combination "encoder" and "connector". The
DRM subsystem isn't by far the best solution since it is designed
around PCI-class graphics cards and the split is intended for those
and not for more tightly-knit LCDC+display combinations, but it does
split things the way you're thinking and with a little extra code it
will do exactly what you want if a little less efficient than your
attached driver.

I was sure Sascha had a driver for this already;
http://git.pengutronix.de/?p=imx/linux-2.6.git;a=commit;hÃ33f47fa185edfd1c9d889fc8af040dd557b02c
- it should not be too hard to add your panel and the specific gpio
control as an encoder/connector. Maybe with a user this can actually
go upstream.

-- 
Matt Sealey [off-list ref]
Product Development Analyst, Genesi USA, Inc.