linux-kernel - Re: [PATCH 2/2] ARM64: mt8173: dts Add MT8173 cpufreq driver support

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Message-ID: <20150423125358.GA29702@leverpostej>
Date:	Thu, 23 Apr 2015 13:53:58 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	"pi-cheng.chen" <pi-cheng.chen@...aro.org>
Cc:	Viresh Kumar <viresh.kumar@...aro.org>,
	Mike Turquette <mturquette@...aro.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	"Joe.C" <yingjoe.chen@...iatek.com>,
	Eddie Huang <eddie.huang@...iatek.com>,
	Howard Chen <ibanezchen@...il.com>,
	"fan.chen@...iatek.com" <fan.chen@...iatek.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"linux-mediatek@...ts.infradead.org" 
	<linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH 2/2] ARM64: mt8173: dts Add MT8173 cpufreq driver support

On Mon, Apr 20, 2015 at 10:27:27AM +0100, pi-cheng.chen wrote:
> This patch adds voltage supplies and clocks used by MT8173 cpufreq driver.
> 
> Signed-off-by: pi-cheng.chen <pi-cheng.chen@...aro.org>

This series has no bindings for these properties.

> ---
>  arch/arm64/boot/dts/mediatek/mt8173-evb.dts | 9 +++++++++
>  arch/arm64/boot/dts/mediatek/mt8173.dtsi    | 6 ++++++
>  2 files changed, 15 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt8173-evb.dts b/arch/arm64/boot/dts/mediatek/mt8173-evb.dts
> index 96e141c..7a00cfe 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8173-evb.dts
> +++ b/arch/arm64/boot/dts/mediatek/mt8173-evb.dts
> @@ -330,3 +330,12 @@
>  	status = "okay";
>  	clock-frequency = <100000>;
>  };
> +
> +&cpu0 {
> +	proc-supply = <&mt6397_vpca15_reg>;
> +};
> +
> +&cpu2 {
> +	proc-supply = <&da9211_vcpu_reg>;
> +	sram-supply = <&mt6397_vsramca7_reg>;
> +};


Why do only two CPUs have these properties, and why does one need an
sram-supply?

> diff --git a/arch/arm64/boot/dts/mediatek/mt8173.dtsi b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> index d9cc84e..b8a5454 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> @@ -51,6 +51,9 @@
>  			device_type = "cpu";
>  			compatible = "arm,cortex-a53";
>  			reg = <0x000>;
> +			clocks = <&infracfg INFRA_CA53SEL>,
> +				 <&apmixedsys APMIXED_MAINPLL>;
> +			clock-names = "cpu", "intermediate";
>  		};
>  
>  		cpu1: cpu@1 {
> @@ -65,6 +68,9 @@
>  			compatible = "arm,cortex-a57";
>  			reg = <0x100>;
>  			enable-method = "psci";
> +			clocks = <&infracfg INFRA_CA57SEL>,
> +				 <&apmixedsys APMIXED_MAINPLL>;
> +			clock-names = "cpu", "intermediate";
>  		};

We should really describe this information per-cpu rather than assuming
that it's the same for siblings. Arbitrarily making one CPU in each
cluster (or other arbitrary grouping) special for the binding is silly.

Mark.
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