linux-kernel - Re: [linux-sunxi] [PATCH v4 5/5] ARM: sunxi: dts: Add PS2 nodes for A20 lime2 board

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Date:	Tue, 20 Jan 2015 21:07:40 +0100
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Iain Paton <ipaton0@...il.com>
Cc:	linux-sunxi@...glegroups.com,
	Vishnu Patekar <vishnupatekar0510@...il.com>,
	dmitry.torokhov@...il.com, hdegoede@...hat.com,
	ijc+devicetree@...lion.org.uk,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-input@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [linux-sunxi] [PATCH v4 5/5] ARM: sunxi: dts: Add PS2 nodes for
 A20 lime2 board

On Tue, Jan 20, 2015 at 05:02:06PM +0000, Iain Paton wrote:
> On 16/01/15 14:03, Vishnu Patekar wrote:
> > Signed-off-by: VishnuPatekar <vishnupatekar0510@...il.com>
> > ---
> >  arch/arm/boot/dts/sun7i-a20-olinuxino-lime2.dts |   12 ++++++++++++
> >  1 file changed, 12 insertions(+)
> > 
> > diff --git a/arch/arm/boot/dts/sun7i-a20-olinuxino-lime2.dts b/arch/arm/boot/dts/sun7i-a20-olinuxino-lime2.dts
> > index ed364d5..3365f12 100644
> > --- a/arch/arm/boot/dts/sun7i-a20-olinuxino-lime2.dts
> > +++ b/arch/arm/boot/dts/sun7i-a20-olinuxino-lime2.dts
> > @@ -113,6 +113,18 @@
> >  			status = "okay";
> >  		};
> >  
> > +		ps20: ps2@...2a000 {
> > +			pinctrl-names = "default";
> > +			pinctrl-0 = <&ps20_pins_a>;
> > +			status = "okay";
> > +		};
> > +
> > +		ps21: ps2@...2a400 {
> > +			pinctrl-names = "default";
> > +			pinctrl-0 = <&ps21_pins_a>;
> > +			status = "okay";
> > +		};
> > +
> >  		i2c0: i2c@...2ac00 {
> >  			pinctrl-names = "default";
> >  			pinctrl-0 = <&i2c0_pins_a>;
> > 
> 
> As the Lime2 doesn't actually have any PS2 connectors on the board, 
> I'd prefer that these are not enabled unconditionally. Doing so 
> only makes it more difficult for people who want to use these pins 
> for other functions.
> 
> Device tree overlays seem to be close to being merged, perhaps we 
> could leave enabling this to an overlay?

I already had the exact same reasoning, and this was even removed at
some point. For some reason, it was added back, and I don't really
know why.

Maxime


-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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