linux-kernel - Re: [PATCH 0/3] ARM: DTS: create common dtsi for Peach pit and pi boards

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Message-ID: <CABxcv=nTfkRkpz_zZuxYHznjDuNgpiKO+FD4MnHi2C_2e32eqA@mail.gmail.com>
Date:	Thu, 26 Jun 2014 17:21:16 +0200
From:	Javier Martinez Canillas <javier@...hile0.org>
To:	Naveen Krishna Chatradhi <ch.naveen@...sung.com>
Cc:	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	linux-iio <linux-iio@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Douglas Anderson <dianders@...omium.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Naveen Krishna <naveenkrishna.ch@...il.com>,
	"cpgs ." <cpgs@...sung.com>
Subject: Re: [PATCH 0/3] ARM: DTS: create common dtsi for Peach pit and pi boards

Hello Naveen,

On Thu, Jun 26, 2014 at 2:19 PM, Naveen Krishna Chatradhi
<ch.naveen@...sung.com> wrote:
> This patchset does the following
> 1. Create a common dtsi file cros-exynos-peach.dtsi for
>    exynos5420-peach-pit.dts and exynos5800-peach-pi.dts

There was some previous discussion in this list about what's the best
approach to handle common DTS chunks, please take a look to
http://patchwork.ozlabs.org/patch/362633/.

In summary, there is a common .dtsi file for Daisy based boards
(arch/arm/boot/dts/exynos5250-cros-common.dtsi) but it seems it turned
out to do more harm than good since having a single .dtsi for all the
common DTS chunks is not quite flexible. As more boards gets
introduced you have to start moving stuff from the common .dtsi file
to the board .dts.

The same was tried to do for OMAP2+ boards and it turned out that you
need to either a) create a hierarchy of .dtsi files to model all the
different board combinations that have similar fragments or b) split
out isolated DTS fragments on an .dtsi and include a set of this
fragments.

 For an example of a) you can take a look to
arch/arm/boot/dts/omap3-overo* and for b) to
arch/arm/boot/dts/omap-gpmc-smsc9*.dtsi.

For a Peach Pit/Pi specific example of b) you can look at the recent
arch/arm/boot/dts/cros-ec-keyboard.dtsi file that Doug added for Peach
Pit/Pi keyboard.

Personally I think that b) is a more flexible and reusable approach.
So, maybe instead of creating a cros-exynos-peach.dts to contain all
the common DT nodes you can add a cros-ec-thermistor.dsti file that
only includes the ADC based Thermistor nodes?

Thanks a lot and best regards,
Javier

> 2. Adds the ADC based Thermistor nodes and enables them in peach_pit.dts
>    and peach_pi.dts
> 3. Adds the ADC based Thermistor nodes for Exynos5250 based Snow
> 4. Corrects the vendor prefix for thermistors in exynos4412-trats2.dts
>
> Naveen Krishna Chatradhi (3):
>   ARM: DTS: use new compatible string for thermistors in trats2
>   ARM: DTS: Add NTC thermistor nodes to Exynos5250 based Snow
>   ARM: DTS: Add common dts file for Peach PIT and PI along with ADC
>     nodes
>
>  arch/arm/boot/dts/cros-exynos-peach.dtsi   |   41 ++++++++++++++++++++++++++++
>  arch/arm/boot/dts/exynos4412-trats2.dts    |    4 +--
>  arch/arm/boot/dts/exynos5250-snow.dts      |   34 +++++++++++++++++++++++
>  arch/arm/boot/dts/exynos5420-peach-pit.dts |    6 ++++
>  arch/arm/boot/dts/exynos5800-peach-pi.dts  |    6 ++++
>  5 files changed, 89 insertions(+), 2 deletions(-)
>  create mode 100644 arch/arm/boot/dts/cros-exynos-peach.dtsi
>
> --
> 1.7.9.5
>
> --
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