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Date:   Sat, 11 Aug 2018 02:07:54 +0800
From:   Jianxin Pan <jianxin.pan@...ogic.com>
To:     Jerome Brunet <jbrunet@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        <linux-amlogic@...ts.infradead.org>
CC:     Rob Herring <robh+dt@...nel.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, Carlo Caione <carlo@...one.org>,
        Jian Hu <jian.hu@...ogic.com>,
        Yixun Lan <yixun.lan@...ogic.com>,
        Hanjie Lin <hanjie.lin@...ogic.com>,
        Victor Wan <victor.wan@...ogic.com>
Subject: Re: [PATCH 2/2] arm64: dts: meson-g12a: add initial g12a s905d2 SoC
 DT support

On 8/10/2018 7:58 PM, Jerome Brunet wrote:
> On Thu, 2018-08-09 at 16:22 +0800, Jianxin Pan wrote:
>> Try to add basic DT support for the Amlogic's Meson-G12A S905D2 SoC,
>> which describe components as follows: Reserve Memory, CPU, GIC, IRQ,
>> Timer, UART. It's capable of booting up into the serial console.
>>
>> Signed-off-by: Jianxin <jianxin.pan@...ogic.com>
> 
> Could please fix your signoff here ? Your last name went missing
> 
OK, I will fix this mistake. Thank you for your review.

>> ---
>>  arch/arm64/boot/dts/amlogic/Makefile            |   1 +
>>  arch/arm64/boot/dts/amlogic/meson-g12a-u200.dts |  22 +++
>>  arch/arm64/boot/dts/amlogic/meson-g12a.dtsi     | 174 ++++++++++++++++++++++++
>>  3 files changed, 197 insertions(+)
>>  create mode 100644 arch/arm64/boot/dts/amlogic/meson-g12a-u200.dts
>>  create mode 100644 arch/arm64/boot/dts/amlogic/meson-g12a.dtsi
>>
>> diff --git a/arch/arm64/boot/dts/amlogic/Makefile b/arch/arm64/boot/dts/amlogic/Makefile
>> index a97c0e2..c31f29d6 100644
>> --- a/arch/arm64/boot/dts/amlogic/Makefile
>> +++ b/arch/arm64/boot/dts/amlogic/Makefile
>> @@ -1,5 +1,6 @@
>>  # SPDX-License-Identifier: GPL-2.0
>>  dtb-$(CONFIG_ARCH_MESON) += meson-axg-s400.dtb
>> +dtb-$(CONFIG_ARCH_MESON) += meson-g12a-u200.dtb
>>  dtb-$(CONFIG_ARCH_MESON) += meson-gxbb-nanopi-k2.dtb
>>  dtb-$(CONFIG_ARCH_MESON) += meson-gxbb-nexbox-a95x.dtb
>>  dtb-$(CONFIG_ARCH_MESON) += meson-gxbb-odroidc2.dtb
>> diff --git a/arch/arm64/boot/dts/amlogic/meson-g12a-u200.dts b/arch/arm64/boot/dts/amlogic/meson-g12a-u200.dts
>> new file mode 100644
>> index 0000000..d267a37
>> --- /dev/null
>> +++ b/arch/arm64/boot/dts/amlogic/meson-g12a-u200.dts
>> @@ -0,0 +1,22 @@
>> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
>> +/*
>> + * Copyright (c) 2018 Amlogic, Inc. All rights reserved.
>> + */
>> +
>> +/dts-v1/;
>> +
>> +#include "meson-g12a.dtsi"
>> +
>> +/ {
>> +	compatible = "amlogic,u200", "amlogic,g12a";
>> +	model = "Amlogic Meson G12A U200 Development Board";
>> +
>> +	aliases {
>> +		serial0 = &uart_AO;
>> +	};
>> +};
>> +
>> +&uart_AO {
>> +	status = "okay";
>> +};
>> +
>> diff --git a/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi b/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi
>> new file mode 100644
>> index 0000000..64a0f2e
>> --- /dev/null
>> +++ b/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi
>> @@ -0,0 +1,174 @@
>> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
>> +/*
>> + * Copyright (c) 2018 Amlogic, Inc. All rights reserved.
>> + */
>> +
>> +#include <dt-bindings/gpio/gpio.h>
>> +#include <dt-bindings/interrupt-controller/irq.h>
>> +#include <dt-bindings/interrupt-controller/arm-gic.h>
>> +
>> +/ {
> 
> Could you please order the subnodes alphabetically ?
> 
> In general, we should try to order nodes by addresses when there is one and
> alphabetically when there is none. This is something we have to fix for the AXG
> as well.
> 
> 
OK, I will fix this in g12a first.>> +	compatible = "amlogic,g12a";
>> +
>> +	interrupt-parent = <&gic>;
>> +	#address-cells = <2>;
>> +	#size-cells = <2>;
>> +
>> +	reserved-memory {
>> +		#address-cells = <2>;
>> +		#size-cells = <2>;
>> +		ranges;
>> +
>> +		/* Alternate 3 MiB reserved for ARM Trusted Firmware (BL31) */
> 
> It's the only one (for now at least) so it's not really an alternate, isn't it ?
> 
Yes, the reserved memory for BL31 is a must. I will remove 'Alternate' in V2. 
>> +		secmon_reserved: secmon@...0000 {
>> +			reg = <0x0 0x05000000 0x0 0x300000>;
>> +			no-map;
>> +		};
>> +	};
>> +
>> +	cpus {
>> +		#address-cells = <0x2>;
>> +		#size-cells = <0x0>;
>> +
>> +		cpu0: cpu@0 {
>> +			device_type = "cpu";
>> +			compatible = "arm,cortex-a53", "arm,armv8";
>> +			reg = <0x0 0x0>;
>> +			enable-method = "psci";
>> +			next-level-cache = <&l2>;
>> +		};
>> +
>> +		cpu1: cpu@1 {
>> +			device_type = "cpu";
>> +			compatible = "arm,cortex-a53", "arm,armv8";
>> +			reg = <0x0 0x1>;
>> +			enable-method = "psci";
>> +			next-level-cache = <&l2>;
>> +		};
>> +
>> +		cpu2: cpu@2 {
>> +			device_type = "cpu";
>> +			compatible = "arm,cortex-a53", "arm,armv8";
>> +			reg = <0x0 0x2>;
>> +			enable-method = "psci";
>> +			next-level-cache = <&l2>;
>> +		};
>> +
>> +		cpu3: cpu@3 {
>> +			device_type = "cpu";
>> +			compatible = "arm,cortex-a53", "arm,armv8";
>> +			reg = <0x0 0x3>;
>> +			enable-method = "psci";
>> +			next-level-cache = <&l2>;
>> +		};
>> +
>> +		l2: l2-cache0 {
>> +			compatible = "cache";
>> +		};
>> +	};
>> +
>> +	psci {
>> +		compatible = "arm,psci-1.0";
>> +		method = "smc";
>> +	};
>> +
>> +	timer {
>> +		compatible = "arm,armv8-timer";
>> +		interrupts = <GIC_PPI 13
>> +			(GIC_CPU_MASK_RAW(0xff) | IRQ_TYPE_LEVEL_LOW)>,
>> +			     <GIC_PPI 14
>> +			(GIC_CPU_MASK_RAW(0xff) | IRQ_TYPE_LEVEL_LOW)>,
>> +			     <GIC_PPI 11
>> +			(GIC_CPU_MASK_RAW(0xff) | IRQ_TYPE_LEVEL_LOW)>,
>> +			     <GIC_PPI 10
>> +			(GIC_CPU_MASK_RAW(0xff) | IRQ_TYPE_LEVEL_LOW)>;
>> +	};
>> +
>> +	xtal: xtal-clk {
>> +		compatible = "fixed-clock";
>> +		clock-frequency = <24000000>;
>> +		clock-output-names = "xtal";
>> +		#clock-cells = <0>;
>> +	};
>> +
>> +	soc {
>> +		compatible = "simple-bus";
>> +		#address-cells = <2>;
>> +		#size-cells = <2>;
>> +		ranges;
> 
> Could you please order the different bus by ascending addresses ?
> 
> 
OK, I will change it in v2. Thank you.
>> +
>> +		apb: apb@...00000 {
>> +			compatible = "simple-bus";
>> +			reg = <0x0 0xffe00000 0x0 0x200000>;
>> +			#address-cells = <2>;
>> +			#size-cells = <2>;
>> +			ranges = <0x0 0x0 0x0 0xffe00000 0x0 0x200000>;
>> +		};
>> +
>> +		cbus: bus@...00000 {
>> +			compatible = "simple-bus";
>> +			reg = <0x0 0xffd00000 0x0 0x25000>;
>> +			#address-cells = <2>;
>> +			#size-cells = <2>;
>> +			ranges = <0x0 0x0 0x0 0xffd00000 0x0 0x25000>;
>> +
>> +		};
>> +
>> +		gic: interrupt-controller@...01000 {
>> +			compatible = "arm,gic-400";
>> +			reg = <0x0 0xffc01000 0 0x1000>,
>> +			      <0x0 0xffc02000 0 0x2000>,
>> +			      <0x0 0xffc04000 0 0x2000>,
>> +			      <0x0 0xffc06000 0 0x2000>;
>> +			interrupt-controller;
>> +			interrupts = <GIC_PPI 9
>> +				(GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_HIGH)>;
>> +			#interrupt-cells = <3>;
>> +			#address-cells = <0>;
>> +		};
>> +
>> +		hiubus: bus@...3c000 {
>> +			compatible = "simple-bus";
>> +			reg = <0x0 0xff63c000 0x0 0x1c00>;
>> +			#address-cells = <2>;
>> +			#size-cells = <2>;
>> +			ranges = <0x0 0x0 0x0 0xff63c000 0x0 0x1c00>;
>> +
>> +		};
>> +
>> +		periphs: periphs@...34000 {
>> +			compatible = "simple-bus";
>> +			reg = <0x0 0xff634000 0x0 0x2000>;
>> +			#address-cells = <2>;
>> +			#size-cells = <2>;
>> +			ranges = <0x0 0x0 0x0 0xff634000 0x0 0x2000>;
>> +		};
>> +
>> +		aobus: bus@...00000 {
>> +			compatible = "simple-bus";
>> +			reg = <0x0 0xff800000 0x0 0x100000>;
>> +			#address-cells = <2>;
>> +			#size-cells = <2>;
>> +			ranges = <0x0 0x0 0x0 0xff800000 0x0 0x100000>;
>> +
>> +			uart_AO: serial@...0 {
>> +				compatible = "amlogic,meson-gx-uart", "amlogic,meson-ao-uart";
>> +				reg = <0x0 0x3000 0x0 0x18>;
>> +				interrupts = <GIC_SPI 193 IRQ_TYPE_EDGE_RISING>;
>> +				clocks = <&xtal>, <&xtal>, <&xtal>;
>> +				clock-names = "xtal", "pclk", "baud";
>> +				status = "disabled";
>> +			};
>> +
>> +			uart_AO_B: serial@...0 {
>> +				compatible = "amlogic,meson-gx-uart", "amlogic,meson-ao-uart";
>> +				reg = <0x0 0x4000 0x0 0x18>;
>> +				interrupts = <GIC_SPI 197 IRQ_TYPE_EDGE_RISING>;
>> +				clocks = <&xtal>, <&xtal>, <&xtal>;
>> +				clock-names = "xtal", "pclk", "baud";
>> +				status = "disabled";
>> +			};
>> +
>> +		};
>> +	};
>> +};
> 
> 
> .
> 

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