[PATCH 0/6] staging: bcm2835-firmware-gpio: Initial staging commit

[Stefan Wahren]

Hi Michael,

> Michael Zoran <mzoran at crowfest.net> 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-blob.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