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From: Danny Milosavljevic <dannym-bxPqe3T81XXwRsdMLXbzog@public.gmane.org>
To: Julian Calaby <julian.calaby-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: andre.przywara-5wv7dgnIgG8@public.gmane.org,
	Maxime Ripard
	<maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>,
	Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>,
	linux-sunxi <linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>,
	Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>,
	"Mailing List,
	Arm"
	<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
	"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Catalin Marinas <catalin.marinas-5wv7dgnIgG8@public.gmane.org>,
	Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>,
	Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Pawel Moll <pawel.moll-5wv7dgnIgG8@public.gmane.org>,
	Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
	Ian Campbell
	<ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org>,
	Kumar Gala <galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
	devicetree <devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: Re: [PATCH 11/11] arm64: dts: add Pine64 support
Date: Tue, 9 Feb 2016 21:33:21 +0100	[thread overview]
Message-ID: <20160209213321.7ab6beba@scratchpost.org> (raw)
In-Reply-To: <CAGRGNgWTMVYExfWZceoY2UKVYq=3g6EnhYBqt9GOFk0Yh6j+4g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>

Hi,

On Mon, 8 Feb 2016 11:55:43 +1100
Julian Calaby <julian.calaby-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 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

  parent reply	other threads:[~2016-02-09 20:33 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1454348370-3816-1-git-send-email-andre.przywara@arm.com>
     [not found] ` <1454348370-3816-1-git-send-email-andre.przywara-5wv7dgnIgG8@public.gmane.org>
2016-02-01 17:39   ` [PATCH 05/11] drivers: pinctrl: add driver for Allwinner A64 SoC Andre Przywara
2016-02-01 18:27     ` Karsten Merker
2016-02-01 18:45       ` [linux-sunxi] " Karsten Merker
     [not found]         ` <20160201184505.GB14737-Hlt6eto4P0pdWf7zwHaZWbNAH6kLmebB@public.gmane.org>
2016-02-01 23:02           ` André Przywara
     [not found]       ` <20160201182754.GA14737-Hlt6eto4P0pdWf7zwHaZWbNAH6kLmebB@public.gmane.org>
2016-02-01 22:49         ` André Przywara
     [not found]           ` <56AFE0EC.8080207-5wv7dgnIgG8@public.gmane.org>
2016-02-02  1:58             ` Siarhei Siamashka
2016-02-02 14:24               ` [linux-sunxi] " Andre Przywara
2016-02-02 17:37               ` Maxime Ripard
2016-02-02 10:00             ` Maxime Ripard
2016-02-02 10:09               ` Chen-Yu Tsai
2016-02-02 16:53               ` Andre Przywara
     [not found]                 ` <56B0DF26.10203-5wv7dgnIgG8@public.gmane.org>
2016-02-04 16:51                   ` Maxime Ripard
2016-02-08 15:54                     ` Rob Herring
2016-02-08 15:58                       ` Andre Przywara
     [not found]                         ` <56B8BB1A.8010705-5wv7dgnIgG8@public.gmane.org>
2016-02-09 17:12                           ` Maxime Ripard
2016-02-01 17:39   ` [PATCH 07/11] clk: sunxi: add generic allwinner,sunxi name Andre Przywara
2016-02-08 15:57     ` Rob Herring
2016-02-08 16:06       ` Andre Przywara
2016-02-01 17:39   ` [PATCH 10/11] arm64: dts: add Allwinner A64 SoC .dtsi Andre Przywara
2016-02-01 19:05     ` [linux-sunxi] " Karsten Merker
     [not found]       ` <20160201190521.GC14737-Hlt6eto4P0pdWf7zwHaZWbNAH6kLmebB@public.gmane.org>
2016-02-01 23:03         ` André Przywara
     [not found]     ` <1454348370-3816-11-git-send-email-andre.przywara-5wv7dgnIgG8@public.gmane.org>
2016-02-02 16:24       ` Jens Kuske
2016-02-02 16:46         ` [linux-sunxi] " Andre Przywara
     [not found]           ` <56B0DD67.3060802-5wv7dgnIgG8@public.gmane.org>
2016-02-02 17:40             ` Jens Kuske
2016-02-05  8:55             ` Chen-Yu Tsai
2016-02-05  8:50       ` Maxime Ripard
2016-02-08  9:42         ` Andre Przywara
     [not found]           ` <56B8630B.8060608-5wv7dgnIgG8@public.gmane.org>
2016-02-23 18:45             ` Maxime Ripard
2016-02-01 17:39   ` [PATCH 11/11] arm64: dts: add Pine64 support Andre Przywara
2016-02-01 19:22     ` [linux-sunxi] " Karsten Merker
     [not found]       ` <20160201192257.GD14737-Hlt6eto4P0pdWf7zwHaZWbNAH6kLmebB@public.gmane.org>
2016-02-01 23:04         ` André Przywara
     [not found]     ` <1454348370-3816-12-git-send-email-andre.przywara-5wv7dgnIgG8@public.gmane.org>
2016-02-05  9:03       ` Maxime Ripard
2016-02-05 10:04         ` Andre Przywara
2016-02-08  0:55           ` [linux-sunxi] " Julian Calaby
     [not found]             ` <CAGRGNgWTMVYExfWZceoY2UKVYq=3g6EnhYBqt9GOFk0Yh6j+4g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-02-09 20:33               ` Danny Milosavljevic [this message]
     [not found]           ` <56B47391.1040709-5wv7dgnIgG8@public.gmane.org>
2016-02-11 10:32             ` Maxime Ripard

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