linux-kernel - Re: [PATCH v2 2/2] arm64: dts: mt8173: Add I2C device node

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Date:	Mon, 8 Jun 2015 19:10:37 +0800
From:	Eddie Huang <eddie.huang@...iatek.com>
To:	Sascha Hauer <s.hauer@...gutronix.de>
CC:	Matthias Brugger <matthias.bgg@...il.com>,
	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v2 2/2] arm64: dts: mt8173: Add I2C device node

Hi Sascha,

On Mon, 2015-06-08 at 09:27 +0200, Sascha Hauer wrote:
> Hi Eddie,
> 
> On Mon, Jun 01, 2015 at 09:08:27PM +0800, Eddie Huang wrote:
> > Add MT8173 I2C device nodes, include I2C controllers and pins.
> > MT8173 has six I2C controllers, from i2c0 to i2c6, exclude i2c5.
> > The 6th I2C controller register base doesn't next to 5th I2C,
> > and there is a hardware between 5th and 6th I2C controller. So
> > SoC designer name 6th controller as "i2c6", not "i2c5".
> > 
> > Signed-off-by: Eddie Huang <eddie.huang@...iatek.com>
> > ---
> >  arch/arm64/boot/dts/mediatek/mt8173.dtsi | 119 +++++++++++++++++++++++++++++++
> >  1 file changed, 119 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/mediatek/mt8173.dtsi b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> > index b52ec43..7003ed2 100644
> > --- a/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> > +++ b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> > @@ -158,6 +158,53 @@
> >  			interrupts = <GIC_SPI 145 IRQ_TYPE_LEVEL_HIGH>,
> >  						<GIC_SPI 146 IRQ_TYPE_LEVEL_HIGH>,
> >  						<GIC_SPI 147 IRQ_TYPE_LEVEL_HIGH>;
> > +			i2c0_pins_a: i2c0@0 {
> > +				pins1 {
> > +					pinmux = <MT8173_PIN_45_SDA0__FUNC_SDA0>,
> > +						 <MT8173_PIN_46_SCL0__FUNC_SCL0>;
> > +					bias-disable;
> > +				};
> > +			};
> 
> The pinmux nodes should be in the board dts, not in the SoC dtsi.
> 

These pins are fixed, and all boards using MT8173 SoC I2C controller
should use these pins. To reduce spread these to many board dts files,
so I put i2c pins in SoC dtsi.

Eddie
Thanks


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