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Subject: Re: [PATCH 4/4] arm64: dts: add support for A1 based Amlogic AD401
To:     Jianxin Pan <jianxin.pan@amlogic.com>,
        Kevin Hilman <khilman@baylibre.com>,
        linux-amlogic@lists.infradead.org
Cc:     Rob Herring <robh+dt@kernel.org>, Carlo Caione <carlo@caione.org>,
        Jerome Brunet <jbrunet@baylibre.com>,
        Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
        devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org, Jian Hu <jian.hu@amlogic.com>,
        Hanjie Lin <hanjie.lin@amlogic.com>,
        Xingyu Chen <xingyu.chen@amlogic.com>,
        Victor Wan <victor.wan@amlogic.com>,
        Qiufang Dai <qiufang.dai@amlogic.com>,
        Tao Zeng <tao.zeng@amlogic.com>
References: <1567493475-75451-1-git-send-email-jianxin.pan@amlogic.com>
 <1567493475-75451-5-git-send-email-jianxin.pan@amlogic.com>
From:   Neil Armstrong <narmstrong@baylibre.com>
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Organization: Baylibre
Message-ID: <97a462d6-d98e-f778-96d5-bacd4801df6b@baylibre.com>
Date:   Tue, 3 Sep 2019 09:42:47 +0200
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In-Reply-To: <1567493475-75451-5-git-send-email-jianxin.pan@amlogic.com>
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Sender: linux-kernel-owner@vger.kernel.org
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Hi,

On 03/09/2019 08:51, Jianxin Pan wrote:
> Add basic support for the Amlogic A1 based Amlogic AD401 board:
> 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 Pan <jianxin.pan@amlogic.com>
> ---
>  arch/arm64/boot/dts/amlogic/Makefile           |   1 +
>  arch/arm64/boot/dts/amlogic/meson-a1-ad401.dts |  30 ++++++
>  arch/arm64/boot/dts/amlogic/meson-a1.dtsi      | 121 +++++++++++++++++++++++++
>  3 files changed, 152 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/amlogic/meson-a1-ad401.dts
>  create mode 100644 arch/arm64/boot/dts/amlogic/meson-a1.dtsi
> 
> diff --git a/arch/arm64/boot/dts/amlogic/Makefile b/arch/arm64/boot/dts/amlogic/Makefile
> index edbf128..1720c45 100644
> --- a/arch/arm64/boot/dts/amlogic/Makefile
> +++ b/arch/arm64/boot/dts/amlogic/Makefile
> @@ -36,3 +36,4 @@ dtb-$(CONFIG_ARCH_MESON) += meson-gxm-rbox-pro.dtb
>  dtb-$(CONFIG_ARCH_MESON) += meson-gxm-vega-s96.dtb
>  dtb-$(CONFIG_ARCH_MESON) += meson-sm1-sei610.dtb
>  dtb-$(CONFIG_ARCH_MESON) += meson-sm1-khadas-vim3l.dtb
> +dtb-$(CONFIG_ARCH_MESON) += meson-a1-ad401.dtb
> diff --git a/arch/arm64/boot/dts/amlogic/meson-a1-ad401.dts b/arch/arm64/boot/dts/amlogic/meson-a1-ad401.dts
> new file mode 100644
> index 00000000..3c05cc0
> --- /dev/null
> +++ b/arch/arm64/boot/dts/amlogic/meson-a1-ad401.dts
> @@ -0,0 +1,30 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Copyright (c) 2019 Amlogic, Inc. All rights reserved.
> + */
> +
> +/dts-v1/;
> +
> +#include "meson-a1.dtsi"
> +
> +/ {
> +	compatible = "amlogic,ad401", "amlogic,a1";
> +	model = "Amlogic Meson A1 AD401 Development Board";
> +
> +	aliases {
> +		serial0 = &uart_AO_B;
> +	};
> +	chosen {
> +		stdout-path = "serial0:115200n8";
> +	};
> +	memory@0 {
> +		device_type = "memory";
> +		linux,usable-memory = <0x0 0x0 0x0 0x8000000>;

I'll prefer usage of reg, it's handled the same but linux,usable-memory
is not documented.

> +	};
> +};
> +
> +&uart_AO_B {
> +	status = "okay";
> +	/*pinctrl-0 = <&uart_ao_a_pins>;*/
> +	/*pinctrl-names = "default";*/

Please remove these lines instead of commenting them.

> +};
> diff --git a/arch/arm64/boot/dts/amlogic/meson-a1.dtsi b/arch/arm64/boot/dts/amlogic/meson-a1.dtsi
> new file mode 100644
> index 00000000..b98d648
> --- /dev/null
> +++ b/arch/arm64/boot/dts/amlogic/meson-a1.dtsi
> @@ -0,0 +1,121 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Copyright (c) 2019 Amlogic, Inc. All rights reserved.
> + */
> +
> +#include <dt-bindings/interrupt-controller/irq.h>
> +#include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +/ {
> +	compatible = "amlogic,a1";
> +
> +	interrupt-parent = <&gic>;
> +	#address-cells = <2>;
> +	#size-cells = <2>;
> +
> +	cpus {
> +		#address-cells = <0x2>;
> +		#size-cells = <0x0>;
> +
> +		cpu0: cpu@0 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a35";
> +			reg = <0x0 0x0>;
> +			enable-method = "psci";
> +			next-level-cache = <&l2>;
> +		};
> +
> +		cpu1: cpu@1 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a35";
> +			reg = <0x0 0x1>;
> +			enable-method = "psci";
> +			next-level-cache = <&l2>;
> +		};
> +
> +		l2: l2-cache0 {
> +			compatible = "cache";
> +		};
> +	};
> +	psci {
> +		compatible = "arm,psci-1.0";
> +		method = "smc";
> +	};
> +
> +	reserved-memory {
> +		#address-cells = <2>;
> +		#size-cells = <2>;
> +		ranges;

Isn't there secmon reserved memory ?

> +
> +		linux,cma {
> +			compatible = "shared-dma-pool";
> +			reusable;
> +			size = <0x0 0x800000>;
> +			alignment = <0x0 0x400000>;
> +			linux,cma-default;
> +		};
> +	};
> +
> +	sm: secure-monitor {
> +		compatible = "amlogic,meson-gxbb-sm";
> +	};
> +
> +	soc {
> +		compatible = "simple-bus";
> +		#address-cells = <2>;
> +		#size-cells = <2>;
> +		ranges;
> +
> +		uart_AO: serial@fe001c00 {
> +			compatible = "amlogic,meson-gx-uart",
> +				     "amlogic,meson-ao-uart";
> +			reg = <0x0 0xfe001c00 0x0 0x18>;
> +			interrupts = <GIC_SPI 25 IRQ_TYPE_EDGE_RISING>;
> +			clocks = <&xtal>, <&xtal>, <&xtal>;
> +			clock-names = "xtal", "pclk", "baud";
> +			status = "disabled";
> +		};
> +
> +		uart_AO_B: serial@fe002000 {
> +			compatible = "amlogic,meson-gx-uart",
> +				     "amlogic,meson-ao-uart";
> +				     reg = <0x0 0xfe002000 0x0 0x18>;
> +			interrupts = <GIC_SPI 26 IRQ_TYPE_EDGE_RISING>;
> +			clocks = <&xtal>, <&xtal>, <&xtal>;
> +			clock-names = "xtal", "pclk", "baud";
> +			status = "disabled";
> +		};
> +
> +		gic: interrupt-controller@ff901000 {
> +			compatible = "arm,gic-400";
> +			reg = <0x0 0xff901000 0x0 0x1000>,
> +			      <0x0 0xff902000 0x0 0x2000>,
> +			      <0x0 0xff904000 0x0 0x2000>,
> +			      <0x0 0xff906000 0x0 0x2000>;
> +			interrupt-controller;
> +			interrupts = <GIC_PPI 9
> +				(GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_HIGH)>;
> +			#interrupt-cells = <3>;
> +			#address-cells = <0>;
> +		};
> +	};
> +
> +	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>;
> +	};
> +};
> 

Thanks,
Neil