linux-kernel - Re: [PATCH 2/2] arm64: dts: berlin4ct: enable all i2c nodes for the STB board

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Message-ID: <20151123104958.09420cee@xhacker>
Date:	Mon, 23 Nov 2015 10:49:58 +0800
From:	Jisheng Zhang <jszhang@...vell.com>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
CC:	<robh+dt@...nel.org>, <pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
	<catalin.marinas@....com>, <will.deacon@....com>,
	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] arm64: dts: berlin4ct: enable all i2c nodes for the
 STB board

Dear Sebastian,

On Fri, 20 Nov 2015 22:19:32 +0100
Sebastian Hesselbarth wrote:

> On 20.11.2015 10:47, Jisheng Zhang wrote:
> > Enable all i2c nodes for the Marvell berlin BG4CT STB board.
> > 
> > Signed-off-by: Jisheng Zhang <jszhang@...vell.com>
> > ---
> >  arch/arm64/boot/dts/marvell/berlin4ct-stb.dts | 50 +++++++++++++++++++++++++++
> >  1 file changed, 50 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/marvell/berlin4ct-stb.dts b/arch/arm64/boot/dts/marvell/berlin4ct-stb.dts
> > index 348c37e..9e8e2e0 100644
> > --- a/arch/arm64/boot/dts/marvell/berlin4ct-stb.dts
> > +++ b/arch/arm64/boot/dts/marvell/berlin4ct-stb.dts
> > @@ -61,6 +61,56 @@
> >  	};
> >  };
> >  
> > +&avio_pinctrl {
> > +	twsi1_pmux: twsi1-pmux {
> > +		groups = "TX_EDDC_SCL", "TX_EDDC_SDA";
> > +		function = "tx_eddc";
> > +	};  
> 
> Please keep the pinmux sub-nodes in the SoC dtsi as long
> as they are not strictly board specific, i.e. gpios.

Hmm, seems all boards configure this pin for EDDC usage, so it's fine
to move to soc

> 
> > +};
> > +
> > +&i2c0 {
> > +	status = "okay";
> > +	pinctrl-0 = <&twsi0_pmux>;
> > +	pinctrl-names = "default";  
> 
> If there is only one (or a default) pinctrl-0 option for i2c0,
> you can also move it to the SoC dtsi.

Some board may not use i2c0, i2c2, i2c3 host and use the pin as gpio for other
purpose. Considering the above twsi1_pmux usage, what's the better solution?
move twsi1_pmux to soc's dtsi and leave i2c0, i2c2, i2c3 pinctrl in board dts?

> 
> > +};
> > +
> > +&i2c1 {
> > +	status = "okay";
> > +	pinctrl-0 = <&twsi1_pmux>;
> > +	pinctrl-names = "default";  
> 
> ditto.
> 
> > +};
> > +
> > +&i2c2 {
> > +	status = "okay";
> > +	pinctrl-0 = <&twsi2_pmux>;
> > +	pinctrl-names = "default";  
> 
> ditto.
> 
> > +};
> > +
> > +&i2c3 {
> > +	status = "okay";
> > +	pinctrl-0 = <&twsi3_pmux>;
> > +	pinctrl-names = "default";  
> 
> ditto.
> 
> > +};
> > +
> > +&soc_pinctrl {
> > +	twsi0_pmux: twsi0-pmux {
> > +		groups = "TW0_SCL", "TW0_SDA";
> > +		function = "tw0";
> > +	};  
> 
> Same comment about moving pinmux nodes to SoC dtsi.
> 
> > +};
> > +
> > +&system_pinctrl {
> > +	twsi2_pmux: twsi2-pmux {
> > +		groups = "SM_TW2_SCL", "SM_TW2_SDA";
> > +		function = "tw2";
> > +	};
> > +
> > +	twsi3_pmux: twsi3-pmux {
> > +		groups = "SM_TW3_SCL", "SM_TW3_SDA";
> > +		function = "tw3";
> > +	};  
> 
> ditto.
> 
> Sebastian
> 
> > +};
> > +
> >  &uart0 {
> >  	status = "okay";
> >  };
> >   
> 

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