lkml.org 
[lkml]   [2016]   [Feb]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [linux-sunxi] Re: [PATCH 11/11] arm64: dts: add Pine64 support
Hi,

On Mon, 8 Feb 2016 11:55:43 +1100
Julian Calaby <julian.calaby@gmail.com> wrote:

> I believe that device tree overlays are the generally recommended method.

I agree. But last time I tried, the device tree compiler didn't
support overlays - neither in Debian nor in the in-kernel dtc ("-@" is
unsupported; last tried with linux-4.3-rc7).

And even if you could compile them, the platform has to support specifying which
overlays to use in the first place (for example as a Linux cmdline option).

For example Beaglebone Black (TI Sitara) does. I don't know whether sunxi does.

Also, the overlay dts files are very different from normal dts files, see
<http://www.patternagents.com/news/2015/01/29/devicetree-overlays.html>.

The original Linux device tree changeset patchset also introduced an in-kernel
interface for loading/unloading of DT overlays at runtime. AFAIK, this is still
not available to user space.

More info at <https://lwn.net/Articles/616859/>.

(I tried some 4 months ago - it wasn't integrated enough.
So now I just patch the main dts every time - which I probably shouldn't)

Regards,
Danny

\
 
 \ /
  Last update: 2016-02-09 22:21    [W:0.082 / U:0.016 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site