Re: [PATCH RFC v7 4/6] dma: mpc512x: add device tree binding document

On Wed, Feb 12, 2014 at 17:25 +0400, Alexander Popov wrote:

From: Gerhard Sittig <redacted>

introduce a device tree binding document for the MPC512x DMA controller

Signed-off-by: Gerhard Sittig <redacted>
[ a13xp0p0v88-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org: turn this into a separate patch ]

As stated in the previous iteration, this one no longer is good
enough.  As time has passed, we have moved forward and learned
something.  We would not write a binding like this today.
Admittedly I went dormant (did not provide an update) since v6.

There are several issues.
- The MPC512x DMA completely lacks a binding document, so one
  should get added.
- The MPC8308 hardware is similar and can re-use the MPC512x
  binding, which should be stated.
- The Linux implementation currently has no OF based channel
  lookup support, so '#dma-cells' is "a future feature".  I guess
  the binding can and should already discuss the feature,
  regardless of whether all implementations support it.


virtually yours
Gerhard Sittig
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