Message-Id: <1C87B1C1-122F-491C-9D3A-1FE1EF6F2B87@gmail.com>
Date:   Thu, 27 Apr 2023 10:28:06 +0100
From:   Christian Hewitt <christianshewitt@...il.com>
To:     Xianwei Zhao <xianwei.zhao@...ogic.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        LKML <linux-kernel@...r.kernel.org>,
        AML <linux-amlogic@...ts.infradead.org>,
        devicetree <devicetree@...r.kernel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Kevin Hilman <khilman@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Subject: Re: [PATCH V2] arm64: dts: add support for C3 based Amlogic AW409


> On 27 Apr 2023, at 9:58 am, Xianwei Zhao <xianwei.zhao@...ogic.com> wrote:
> 
> Amlogic C3 is an advanced edge AI processor designed for smart IP camera
> applications.
> 
> Add basic support for the C3 based Amlogic AW409 board, which describes
> the following components: CPU, GIC, IRQ, Timer, UART. It's capable of
> booting up into the serial console.
> 
> Signed-off-by: Xianwei Zhao <xianwei.zhao@...ogic.com>
> 
> ---
> V1 -> V2: Remove new arch, and use ARCH_MESON;
>         Modify node name, and delete superfluous blank lines.
> ---
> arch/arm64/boot/dts/amlogic/Makefile          |  1 +
> .../amlogic/amlogic-c3-c302x-aw409-256m.dts   | 29 +++++++
> arch/arm64/boot/dts/amlogic/amlogic-c3.dtsi   | 86 +++++++++++++++++++
> 3 files changed, 116 insertions(+)
> create mode 100644 arch/arm64/boot/dts/amlogic/amlogic-c3-c302x-aw409-256m.dts
> create mode 100644 arch/arm64/boot/dts/amlogic/amlogic-c3.dtsi
> 
> diff --git a/arch/arm64/boot/dts/amlogic/Makefile b/arch/arm64/boot/dts/amlogic/Makefile
> index cd1c5b04890a..bcec872c2444 100644
> --- a/arch/arm64/boot/dts/amlogic/Makefile
> +++ b/arch/arm64/boot/dts/amlogic/Makefile
> @@ -74,3 +74,4 @@ dtb-$(CONFIG_ARCH_MESON) += meson-sm1-odroid-hc4.dtb
> dtb-$(CONFIG_ARCH_MESON) += meson-sm1-sei610.dtb
> dtb-$(CONFIG_ARCH_MESON) += meson-sm1-x96-air-gbit.dtb
> dtb-$(CONFIG_ARCH_MESON) += meson-sm1-x96-air.dtb
> +dtb-$(CONFIG_ARCH_MESON) += amlogic-c3-c302x-aw409-256m.dtb

^ please keep the list alpha-sorted, and 256m is described in the dts
so there is no need to include it in the board filename. I would also
expect meson-c3* to align with existing filenames, but I’ll let others
comment on naming rules.

Christian

> diff --git a/arch/arm64/boot/dts/amlogic/amlogic-c3-c302x-aw409-256m.dts b/arch/arm64/boot/dts/amlogic/amlogic-c3-c302x-aw409-256m.dts
> new file mode 100644
> index 000000000000..edce8850b338
> --- /dev/null
> +++ b/arch/arm64/boot/dts/amlogic/amlogic-c3-c302x-aw409-256m.dts
> @@ -0,0 +1,29 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Copyright (c) 2021 Amlogic, Inc. All rights reserved.
> + */
> +
> +/dts-v1/;
> +
> +#include "amlogic-c3.dtsi"
> +
> +/ {
> +	model = "Amlogic C302 aw409 Development Board";
> +	compatible = "amlogic,aw409", "amlogic,c3";
> +	interrupt-parent = <&gic>;
> +	#address-cells = <2>;
> +	#size-cells = <2>;
> +
> +	aliases {
> +		serial0 = &uart_b;
> +	};
> +
> +	memory@0 {
> +		device_type = "memory";
> +		reg = <0x0 0x0 0x0 0x10000000>;
> +	};
> +};
> +
> +&uart_b {
> +	status = "okay";
> +};
> diff --git a/arch/arm64/boot/dts/amlogic/amlogic-c3.dtsi b/arch/arm64/boot/dts/amlogic/amlogic-c3.dtsi
> new file mode 100644
> index 000000000000..93b335aef605
> --- /dev/null
> +++ b/arch/arm64/boot/dts/amlogic/amlogic-c3.dtsi
> @@ -0,0 +1,86 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Copyright (c) 2021 Amlogic, Inc. All rights reserved.
> + */
> +
> +#include <dt-bindings/interrupt-controller/irq.h>
> +#include <dt-bindings/interrupt-controller/arm-gic.h>
> +#include <dt-bindings/gpio/gpio.h>
> +
> +/ {
> +	cpus {
> +		#address-cells = <2>;
> +		#size-cells = <0>;
> +
> +		cpu0: cpu@0 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a35";
> +			reg = <0x0 0x0>;
> +			enable-method = "psci";
> +		};
> +
> +		cpu1: cpu@1 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a35";
> +			reg = <0x0 0x1>;
> +			enable-method = "psci";
> +		};
> +	};
> +
> +	timer {
> +		compatible = "arm,armv8-timer";
> +		interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>;
> +	};
> +
> +	psci {
> +		compatible = "arm,psci-1.0";
> +		method = "smc";
> +	};
> +
> +	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;
> +
> +		gic: interrupt-controller@...01000 {
> +			compatible = "arm,gic-400";
> +			#interrupt-cells = <3>;
> +			#address-cells = <0>;
> +			interrupt-controller;
> +			reg = <0x0 0xfff01000 0 0x1000>,
> +			      <0x0 0xfff02000 0 0x2000>,
> +			      <0x0 0xfff04000 0 0x2000>,
> +			      <0x0 0xfff06000 0 0x2000>;
> +			interrupts = <GIC_PPI 9 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_HIGH)>;
> +		};
> +
> +		apb4: bus@...00000 {
> +			compatible = "simple-bus";
> +			reg = <0x0 0xfe000000 0x0 0x480000>;
> +			#address-cells = <2>;
> +			#size-cells = <2>;
> +			ranges = <0x0 0x0 0x0 0xfe000000 0x0 0x480000>;
> +
> +			uart_b: serial@...00 {
> +				compatible = "amlogic,meson-g12a-uart";
> +				reg = <0x0 0x7a000 0x0 0x18>;
> +				interrupts = <GIC_SPI 169 IRQ_TYPE_EDGE_RISING>;
> +				status = "disabled";
> +				clocks = <&xtal>, <&xtal>, <&xtal>;
> +				clock-names = "xtal", "pclk", "baud";
> +			};
> +
> +		};
> +	};
> +};
> 
> base-commit: ae68fb187b59bc8645974320808ab2d7c41b1833
> -- 
> 2.37.1
> 
> 
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> linux-amlogic@...ts.infradead.org
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