[PATCH v2 2/2] arm64: dts: Add Mediatek SoC MT2712 and evaluation board dts and Makefile

Marc Zyngier marc.zyngier at arm.com
Fri Jun 9 06:50:56 PDT 2017


On 09/06/17 14:41, YT Shen wrote:
> On Wed, 2017-05-31 at 13:38 +0100, Marc Zyngier wrote:
>> On 31/05/17 12:39, YT Shen wrote:
>>> This adds basic chip support for Mediatek 2712
>>>
>>> Signed-off-by: YT Shen <yt.shen at mediatek.com>
>>> ---
>>>  arch/arm64/boot/dts/mediatek/Makefile       |   1 +
>>>  arch/arm64/boot/dts/mediatek/mt2712-evb.dts |  39 +++++++
>>>  arch/arm64/boot/dts/mediatek/mt2712e.dtsi   | 166 ++++++++++++++++++++++++++++
>>>  3 files changed, 206 insertions(+)
>>>  create mode 100644 arch/arm64/boot/dts/mediatek/mt2712-evb.dts
>>>  create mode 100644 arch/arm64/boot/dts/mediatek/mt2712e.dtsi
>>>
>>> diff --git a/arch/arm64/boot/dts/mediatek/Makefile b/arch/arm64/boot/dts/mediatek/Makefile
>>> index 9fbfd32..fcc0604 100644
>>> --- a/arch/arm64/boot/dts/mediatek/Makefile
>>> +++ b/arch/arm64/boot/dts/mediatek/Makefile
>>> @@ -1,3 +1,4 @@
>>> +dtb-$(CONFIG_ARCH_MEDIATEK) += mt2712-evb.dtb
>>>  dtb-$(CONFIG_ARCH_MEDIATEK) += mt6755-evb.dtb
>>>  dtb-$(CONFIG_ARCH_MEDIATEK) += mt6795-evb.dtb
>>>  dtb-$(CONFIG_ARCH_MEDIATEK) += mt8173-evb.dtb
>>> diff --git a/arch/arm64/boot/dts/mediatek/mt2712-evb.dts b/arch/arm64/boot/dts/mediatek/mt2712-evb.dts
>>> new file mode 100644
>>> index 0000000..e526c0f
>>> --- /dev/null
>>> +++ b/arch/arm64/boot/dts/mediatek/mt2712-evb.dts
>>> @@ -0,0 +1,39 @@
>>> +/*
>>> + * Copyright (c) 2017 MediaTek Inc.
>>> + * Author: YT Shen <yt.shen at mediatek.com>
>>> + *
>>> + * SPDX-License-Identifier: (GPL-2.0 OR MIT)
>>> + */
>>> +
>>> +/dts-v1/;
>>> +#include "mt2712e.dtsi"
>>> +
>>> +/ {
>>> +	model = "MediaTek MT2712 evaluation board";
>>> +	compatible = "mediatek,mt2712-evb", "mediatek,mt2712";
>>> +
>>> +	aliases {
>>> +		serial0 = &uart0;
>>> +		serial1 = &uart1;
>>> +		serial2 = &uart2;
>>> +		serial3 = &uart3;
>>> +		serial4 = &uart4;
>>> +		serial5 = &uart5;
>>> +	};
>>> +
>>> +	memory at 40000000 {
>>> +		device_type = "memory";
>>> +		reg = <0 0x40000000 0 0x80000000>;
>>> +	};
>>> +
>>> +	chosen {
>>> +		stdout-path = "serial0:921600n8";
>>> +		linux,initrd-start = <0x45000000>;
>>> +		linux,initrd-end   = <0x4a000000>;
>>> +	};
>>> +};
>>> +
>>> +&uart0 {
>>> +	status = "okay";
>>> +};
>>> +
>>> diff --git a/arch/arm64/boot/dts/mediatek/mt2712e.dtsi b/arch/arm64/boot/dts/mediatek/mt2712e.dtsi
>>> new file mode 100644
>>> index 0000000..6df0da9
>>> --- /dev/null
>>> +++ b/arch/arm64/boot/dts/mediatek/mt2712e.dtsi
>>> @@ -0,0 +1,166 @@
>>> +/*
>>> + * Copyright (c) 2017 MediaTek Inc.
>>> + * Author: YT Shen <yt.shen at mediatek.com>
>>> + *
>>> + * SPDX-License-Identifier: (GPL-2.0 OR MIT)
>>> + */
>>> +
>>> +#include <dt-bindings/interrupt-controller/irq.h>
>>> +#include <dt-bindings/interrupt-controller/arm-gic.h>
>>> +
>>> +/ {
>>> +	compatible = "mediatek,mt2712";
>>> +	interrupt-parent = <&sysirq>;
>>> +	#address-cells = <2>;
>>> +	#size-cells = <2>;
>>> +
>>> +	cpus {
>>> +		#address-cells = <1>;
>>> +		#size-cells = <0>;
>>> +
>>> +		cpu-map {
>>> +			cluster0 {
>>> +				core0 {
>>> +					cpu = <&cpu0>;
>>> +				};
>>> +				core1 {
>>> +					cpu = <&cpu1>;
>>> +				};
>>> +			};
>>> +
>>> +			cluster1 {
>>> +				core0 {
>>> +					cpu = <&cpu2>;
>>> +				};
>>> +			};
>>> +		};
>>> +
>>> +		cpu0: cpu at 0 {
>>> +			device_type = "cpu";
>>> +			compatible = "arm,cortex-a35";
>>> +			reg = <0x000>;
>>> +		};
>>> +
>>> +		cpu1: cpu at 1 {
>>> +			device_type = "cpu";
>>> +			compatible = "arm,cortex-a35";
>>> +			reg = <0x001>;
>>> +			enable-method = "psci";
>>> +		};
>>> +
>>> +		cpu2: cpu at 200 {
>>> +			device_type = "cpu";
>>> +			compatible = "arm,cortex-a72";
>>> +			reg = <0x200>;
>>> +			enable-method = "psci";
>>> +		};
>>> +	};
>>> +
>>> +	psci {
>>> +		compatible = "arm,psci-0.2";
>>> +		method = "smc";
>>> +	};
>>> +
>>> +	uart_clk: dummy26m {
>>> +		compatible = "fixed-clock";
>>> +		clock-frequency = <26000000>;
>>> +		#clock-cells = <0>;
>>> +	};
>>> +
>>> +	timer {
>>> +		compatible = "arm,armv8-timer";
>>> +		interrupt-parent = <&gic>;
>>> +		interrupts = <GIC_PPI 13
>>> +			      (GIC_CPU_MASK_SIMPLE(6) | IRQ_TYPE_LEVEL_LOW)>,
>>
>> Why 6? I only count 3 cores...
> OK, will change to GIC_CPU_MASK_RAW(0x13)
> 
> Sorry for the late reply.
>>
>>> +			     <GIC_PPI 14
>>> +			      (GIC_CPU_MASK_SIMPLE(6) | IRQ_TYPE_LEVEL_LOW)>,
>>> +			     <GIC_PPI 11
>>> +			      (GIC_CPU_MASK_SIMPLE(6) | IRQ_TYPE_LEVEL_LOW)>,
>>> +			     <GIC_PPI 10
>>> +			      (GIC_CPU_MASK_SIMPLE(6) | IRQ_TYPE_LEVEL_LOW)>;
>>> +	};
>>> +
>>> +	soc {
>>> +		#address-cells = <2>;
>>> +		#size-cells = <2>;
>>> +		compatible = "simple-bus";
>>> +		ranges;
>>> +
>>> +		uart5: serial at 1000f000 {
>>> +			compatible = "mediatek,mt2712-uart",
>>> +				     "mediatek,mt6577-uart";
>>> +			reg = <0 0x1000f000 0 0x400>;
>>> +			interrupts = <GIC_SPI 127 IRQ_TYPE_LEVEL_LOW>;
>>> +			clocks = <&uart_clk>;
>>> +			status = "disabled";
>>> +		};
>>> +
>>> +		sysirq: interrupt-controller at 10220a80 {
>>> +			compatible = "mediatek,mt2712-sysirq",
>>> +				     "mediatek,mt6577-sysirq";
>>> +			interrupt-controller;
>>> +			#interrupt-cells = <3>;
>>> +			interrupt-parent = <&gic>;
>>> +			reg = <0 0x10220a80 0 0x40>;
>>> +		};
>>> +
>>> +		gic: interrupt-controller at 10510000 {
>>> +			compatible = "arm,gic-400";
>>> +			#interrupt-cells = <3>;
>>> +			interrupt-parent = <&gic>;
>>> +			interrupt-controller;
>>> +			reg = <0 0x10510000 0 0x1000>,
>>> +			      <0 0x10520000 0 0x1000>,
>>
>> If that's truly a GIC400, then the above is wrong (the CPU interface is
>> spread over 8kB).
>>
>> I also suspect that the first 4kB are aliased over
>> 0x10520000:0x1052f000, and the second over 0x10530000:0x1053f000 (in the
>> true SBSA tradition). If that's the case, then the size is actually 128kB.
> The chip information at hand is not enough for me to answer this
> question, if I have further document will check this part.
> 
>>
>>> +			      <0 0x10540000 0 0x2000>,
>>> +			      <0 0x10560000 0 0x2000>;
>>
>> Please check GICV as well, which probably behaves the same way.
> The reg entry I changed to 
>   reg = <0 0x10510000 0 0x1000>,
>         <0 0x10520000 0 0x20000>,
>         <0 0x10540000 0 0x20000>,
>         <0 0x10560000 0 0x20000>;
>   is that correct?

Only you (or whoever integrated GIC400 on the platform) can know that.
I'd say that it is likely to be correct based on what's below, but
that's only an educated guess.

> 
> The platform boot to shell successfully.  The boot message shows
> additional different two lines:
> ...
> [    0.000000] GIC: Adjusting CPU interface base to 0x000000001052f000
> [    0.000000] GIC: Using split EOI/Deactivate mode
> ...

Seems OK to me.

>>
>>> +			interrupts = <GIC_PPI 9
>>> +				(GIC_CPU_MASK_SIMPLE(6) | IRQ_TYPE_LEVEL_HIGH)>;
>>
>> Same thing here with 6 CPUs.
> Will change to GIC_CPU_MASK_RAW(0x13)
> 
>>
>>> +		};
>>> +
>>> +		uart0: serial at 11002000 {
>>> +			compatible = "mediatek,mt2712-uart",
>>> +				     "mediatek,mt6577-uart";
>>> +			reg = <0 0x11002000 0 0x400>;
>>> +			interrupts = <GIC_SPI 91 IRQ_TYPE_LEVEL_LOW>;
>>> +			clocks = <&uart_clk>;
>>> +			status = "disabled";
>>> +		};
>>> +
>>> +		uart1: serial at 11003000 {
>>> +			compatible = "mediatek,mt2712-uart",
>>> +				     "mediatek,mt6577-uart";
>>> +			reg = <0 0x11003000 0 0x400>;
>>> +			interrupts = <GIC_SPI 92 IRQ_TYPE_LEVEL_LOW>;
>>> +			clocks = <&uart_clk>;
>>> +			status = "disabled";
>>> +		};
>>> +
>>> +		uart2: serial at 11004000 {
>>> +			compatible = "mediatek,mt2712-uart",
>>> +				     "mediatek,mt6577-uart";
>>> +			reg = <0 0x11004000 0 0x400>;
>>> +			interrupts = <GIC_SPI 93 IRQ_TYPE_LEVEL_LOW>;
>>> +			clocks = <&uart_clk>;
>>> +			status = "disabled";
>>> +		};
>>> +
>>> +		uart3: serial at 11005000 {
>>> +			compatible = "mediatek,mt2712-uart",
>>> +				     "mediatek,mt6577-uart";
>>> +			reg = <0 0x11005000 0 0x400>;
>>> +			interrupts = <GIC_SPI 94 IRQ_TYPE_LEVEL_LOW>;
>>> +			clocks = <&uart_clk>;
>>> +			status = "disabled";
>>> +		};
>>> +
>>> +		uart4: serial at 11019000 {
>>> +			compatible = "mediatek,mt2712-uart",
>>> +				     "mediatek,mt6577-uart";
>>> +			reg = <0 0x11019000 0 0x400>;
>>> +			interrupts = <GIC_SPI 126 IRQ_TYPE_LEVEL_LOW>;
>>> +			clocks = <&uart_clk>;
>>> +			status = "disabled";
>>> +		};
>>> +	};
>>> +};
>>> +
>>>
>>
>> No PMU wired on this system?
> After checking, there is a PMU on the system, but not verified yet.
> And the plan for this patch series does not include PMU, is it
> necessary?

Well, it is an important part of the system, and given that it comes
directly with the CPU cores, it'd be good to have it. But as always,
that's up to you.

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...



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