On Fri, 2017-03-17 at 18:24 +0100, Stefan Wahren wrote: > Hi Michael, > > > Michael Zoran <mzoran@xxxxxxxxxxxx> hat am 17. März 2017 um 17:48 > > geschrieben: > > > > > > On Fri, 2017-03-17 at 17:31 +0100, Stefan Wahren wrote: > > > Hi Michael, > > > > > > > > > Am 17.03.2017 um 16:22 schrieb Michael Zoran: > > > > The firmware now has a mailbox API for performing generalized > > > > gpio > > > > through > > > > the firmware. This driver builds upon a driver written by Dave > > > > Stevenson > > > > that was written specifically for the expander on the RPI 3, > > > > but I > > > > have > > > > generalized for generic GPIO through the firmware. > > > > > > > > With this change I was able to test VC4 on a RPI 3 running in > > > > arm64 > > > > with > > > > a pure mainline tree from the staging branch. > > > > > > > > The firmware gpio numbers are currently documented at: > > > > https://github.com/raspberrypi/firmware/blob/master/extra/dt-bl > > > > ob.d > > > > ts > > > > > > > > > > > > > > could you please explain why this driver should go to staging? > > > > I can think of a few reasons: > > > > 1. The mailbox API is still very new and a work in progress. I'm > > sure > > it's probably going to change some. > > > > 2. It fits in with the VideoCore subsystem idea in that it doesn't > > talk > > directly to hardware. Submitting it to staging would allow us to > > get > > VC4 working sooner to unblock proper testing on a RPI 3. > > > > 3. I have some ideas for this driver for future work that I'm still > > thinking about but I'm not ready yet to submit any changes. > > > > before running into the wrong direction i suggest to send at least 1 > RFC series to the GPIO and the DT mailing list. > > If you interested i can send you my comments to this series. > > Stefan Sure I'm interested in comments, but keep in mind I generalized the driver really, really fast. We probably need to change the name of the driver and the comment block at the top. I also noticed when the driver loads it's complaining about no GPIO parent so it certainly needs work. I was hoping people would be happy that we have some way to get some VC4 support on mainline. I still think this belongs with VideoCore rather then the general kernel tree. And for now VideoCore is in staging. _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
