linux-kernel - Re: [PATCH 4/4] arm64: dts: qcom: msm8916: add bindings for i2c1, i2c3, i2c5

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Message-ID: <20171109171456.6t3nhig6t4bnkc77@workotop.localdomain>
Date:   Thu, 9 Nov 2017 12:14:56 -0500
From:   Damien Riegel <damien.riegel@...oirfairelinux.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>, kernel@...oirfairelinux.com
Subject: Re: [PATCH 4/4] arm64: dts: qcom: msm8916: add bindings for i2c1,
 i2c3, i2c5

Hi Bjorn,


On Thu, Nov 09, 2017 at 09:00:16AM -0800, Bjorn Andersson wrote:
> On Wed 01 Nov 10:53 PDT 2017, Damien Riegel wrote:
> 
> I think it's better to use the word "nodes" (add nodes...)

Will reword that.

> 
> > Signed-off-by: Damien Riegel <damien.riegel@...oirfairelinux.com>
> > ---
> >  arch/arm64/boot/dts/qcom/msm8916-pins.dtsi | 72 ++++++++++++++++++++++++++++++
> >  arch/arm64/boot/dts/qcom/msm8916.dtsi      | 45 +++++++++++++++++++
> >  2 files changed, 117 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/msm8916-pins.dtsi b/arch/arm64/boot/dts/qcom/msm8916-pins.dtsi
> > index c67ad8ed8b60..1cec5b30ed6e 100644
> > --- a/arch/arm64/boot/dts/qcom/msm8916-pins.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/msm8916-pins.dtsi
> > @@ -270,6 +270,30 @@
> >  		};
> >  	};
> >  
> > +	i2c1_default: i2c1_default {
> > +		pinmux {
> > +			function = "blsp_i2c1";
> > +			pins = "gpio2", "gpio3";
> > +		};
> > +		pinconf {
> > +			pins = "gpio2", "gpio3";
> > +			drive-strength = <16>;
> > +			bias-disable;
> > +		};
> 
> pinconf is typically board specific, so please leave these out from the
> base dtsi.

I don't mind dropping that, but pinconf for i2c{2,4,6} is already in
msm8916-pins.dtsi, so we should either drop them all, or add pinconf for
i2c{1,3,5} for consistency. And if I read the pinctrl driver correctly,
I2C cannot be routed to other pins, the only properties that users may
want to modify are drive-strength and bias. Let me know which option you
prefer.


> > diff --git a/arch/arm64/boot/dts/qcom/msm8916.dtsi b/arch/arm64/boot/dts/qcom/msm8916.dtsi
> > index de25bd6070f5..bdc4cb6f66d4 100644
> > --- a/arch/arm64/boot/dts/qcom/msm8916.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/msm8916.dtsi
> > @@ -455,6 +455,21 @@
> >  			status = "disabled";
> >  		};
> >  
> > +		blsp_i2c1: i2c@...5000 {
> > +			compatible = "qcom,i2c-qup-v2.2.1";
> > +			reg = <0x078b5000 0x600>;
> 
> Size is 0x500.

Will update that (and will also do that for patch 3)

> > +			interrupts = <GIC_SPI 95 0>;
> > +			clocks = <&gcc GCC_BLSP1_AHB_CLK>,
> > +				 <&gcc GCC_BLSP1_QUP1_I2C_APPS_CLK>;
> > +			clock-names = "iface", "core";
> > +			pinctrl-names = "default", "sleep";
> > +			pinctrl-0 = <&i2c1_default>;
> > +			pinctrl-1 = <&i2c1_sleep>;
> 
> Please omit the pinctrl-* properties from the base dtsi (when it's not
> hard coded things for the platform).
> 
> > +			#address-cells = <1>;
> > +			#size-cells = <0>;
> > +			status = "disabled";
> > +		};
> > +
> >  		blsp_i2c2: i2c@...6000 {
> >  			compatible = "qcom,i2c-qup-v2.2.1";
> >  			reg = <0x078b6000 0x600>;
> 
> Otherwise this looks good!

Thank you for the review,
-- 
Damien