linux-kernel - Re: [PATCH] ARM64: dts: rockchip: add core dtsi file for RK3399 SoCs

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Date:	Thu, 21 Apr 2016 18:47:20 +0800
From:	"Huang, Tao" <huangtao@...k-chips.com>
To:	Mark Rutland <mark.rutland@....com>,
	Jianqun Xu <jay.xu@...k-chips.com>, will.deacon@....com,
	marc.zyngier@....com
Cc:	robh+dt@...nel.org, pawel.moll@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	catalin.marinas@....com, heiko@...ech.de, davidriley@...omium.org,
	dianders@...omium.org, jwerner@...omium.org, smbarber@...omium.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM64: dts: rockchip: add core dtsi file for RK3399 SoCs

Hi, Mark:
On 2016年04月21日 18:19, Mark Rutland wrote:
> On Thu, Apr 21, 2016 at 11:58:12AM +0800, Jianqun Xu wrote:
>> +		cpu_l0: cpu@0 {
>> +			device_type = "cpu";
>> +			compatible = "arm,cortex-a53", "arm,armv8";
>> +			reg = <0x0 0x0>;
>> +			enable-method = "psci";
>> +			#cooling-cells = <2>; /* min followed by max */
>> +			clocks = <&cru ARMCLKL>;
>> +		};
>> +		cpu_b0: cpu@100 {
>> +			device_type = "cpu";
>> +			compatible = "arm,cortex-a72", "arm,armv8";
>> +			reg = <0x0 0x100>;
>> +			enable-method = "psci";
>> +			#cooling-cells = <2>; /* min followed by max */
>> +			clocks = <&cru ARMCLKB>;
>> +		};
>> +
>> +	arm-pmu {
>> +		compatible = "arm,armv8-pmuv3";
>> +		interrupts = <GIC_PPI 7 IRQ_TYPE_LEVEL_LOW>;
>> +	};
> This is wrong, and must go. There should be a separate node for the PMU
> of each microarchitecture, with the appropriate compatible string to
> represent that (see the juno dts).
You are right. The first version we wrote is:
    pmu_a53 {
        compatible = "arm,cortex-a53-pmu";
        interrupts = <GIC_PPI 7 IRQ_TYPE_LEVEL_LOW>;
        interrupt-affinity = <&cpu_l0>,
                     <&cpu_l1>,
                     <&cpu_l2>,
                     <&cpu_l3>;
    };

    pmu_a72 {
        compatible = "arm,cortex-a72-pmu";
        interrupts = <GIC_PPI 7 IRQ_TYPE_LEVEL_LOW>;
        interrupt-affinity = <&cpu_b0>,
                     <&cpu_b1>;
    };
but unfortunately, the arm pmu driver do not support PPI in two cluster
well,
so we have to replace with this implementation.
> In this case things are messier as the same PPI number is being used
> across clusters. Marc (Cc'd) has been working on PPI partitions, which
> should allow us to support that.
Great! So what we can do right now? Wait this feature, and delete
arm-pmu node?

Thanks,
Huang, Tao