Subject: [PATCH 3/5] arm: shmobile: r7s72100: add nodes for i2c controllers to dtsi

From: [email-masked] (Wolfram Sang)
Date: Tue, 17 Dec 2013 23:13:09 +0100

Hi,

On Tue, Dec 17, 2013 at 10:55:31PM +0100, Laurent Pinchart wrote:
> Hi Wolfram,
> 
> Thank you for the patch.
> 
> On Tuesday 17 December 2013 22:44:36 Wolfram Sang wrote:
> > From: Wolfram Sang <[email-masked]>
> > 
> > I decided to put the pinmuxing into the dtsi file since there is only
> > one pinmux posiibility which one probably wants to have when using the
> > bus.

I tried to explain here why the pin-groups are in the dtsi.

> > +		riic0_pins: i2c0 {
> > +			renesas,groups = "riic0_scl_p1_0", "riic0_sda_p1_1";
> > +			renesas,function = "riic0";
> > +		};
> > +
> > +		riic1_pins: i2c1 {
> > +			renesas,groups = "riic1_scl_p1_2", "riic1_sda_p1_3";
> > +			renesas,function = "riic1";
> > +		};
> > +
> > +		riic2_pins: i2c2 {
> > +			renesas,groups = "riic2_scl_p1_4", "riic2_sda_p1_5";
> > +			renesas,function = "riic2";
> > +		};
> > +
> > +		riic3_pins: i2c3 {
> > +			renesas,groups = "riic3_scl_p1_6", "riic3_sda_p1_7";
> > +			renesas,function = "riic3";
> > +		};
> 
> The SoC allows other options for the I2C pin groups. Instead of declaring all 
> possible groups here, I think we should thus only add the groups that are 
> really used to the board .dts files.

Really? Couldn't find any. This is why I included it here: since it is
the only option, people probably want to use it when they activate the
bus.

> > +		clock-frequency = <100000>;
> 
> Isn't that a board-specific property ?

It is meant as a sane default. Can be overridden.

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