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Date:   Thu, 14 Oct 2021 17:32:34 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Sam Shih <sam.shih@...iatek.com>, Rob Herring <robh+dt@...nel.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Fabien Parent <fparent@...libre.com>,
        Seiya Wang <seiya.wang@...iatek.com>,
        Sean Wang <sean.wang@...iatek.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Cc:     John Crispin <john@...ozen.org>, Ryder Lee <Ryder.Lee@...iatek.com>
Subject: Re: [PATCH v6 3/3] arm64: dts: mediatek: add basic mt7986b support



On 14/10/2021 09:44, Sam Shih wrote:
> Add basic chip support for Mediatek mt7986b, include
> basic uart nodes, rng node and watchdog node.
> 
> Add cpu node, timer node, gic node, psci and reserved-memory node
> for ARM Trusted Firmware.
> 
> Signed-off-by: Sam Shih <sam.shih@...iatek.com>
> 
> ---
> v6: separate basic part into a single patch series
> v5: follow reviewr's comment: removed clock freqency node in timer due to
>      we have set CNTFRQ_EL0 in ATF firmware, and also corrected GICD range
> v4: added missing gic register bases, and fixed range of GICR
> v3: used the stdout-path instead of console=ttyS0
> v2: modified clock and uart node due to clock driver updated
> ---
>   arch/arm64/boot/dts/mediatek/Makefile        |   1 +
>   arch/arm64/boot/dts/mediatek/mt7986b-rfb.dts |  26 ++++
>   arch/arm64/boot/dts/mediatek/mt7986b.dtsi    | 149 +++++++++++++++++++
>   3 files changed, 176 insertions(+)
>   create mode 100644 arch/arm64/boot/dts/mediatek/mt7986b-rfb.dts
>   create mode 100644 arch/arm64/boot/dts/mediatek/mt7986b.dtsi
> 
> diff --git a/arch/arm64/boot/dts/mediatek/Makefile b/arch/arm64/boot/dts/mediatek/Makefile
> index e6c3a73b9e4a..d555e43d1ccc 100644
> --- a/arch/arm64/boot/dts/mediatek/Makefile
> +++ b/arch/arm64/boot/dts/mediatek/Makefile
> @@ -8,6 +8,7 @@ dtb-$(CONFIG_ARCH_MEDIATEK) += mt6797-x20-dev.dtb
>   dtb-$(CONFIG_ARCH_MEDIATEK) += mt7622-rfb1.dtb
>   dtb-$(CONFIG_ARCH_MEDIATEK) += mt7622-bananapi-bpi-r64.dtb
>   dtb-$(CONFIG_ARCH_MEDIATEK) += mt7986a-rfb.dtb
> +dtb-$(CONFIG_ARCH_MEDIATEK) += mt7986b-rfb.dtb
>   dtb-$(CONFIG_ARCH_MEDIATEK) += mt8167-pumpkin.dtb
>   dtb-$(CONFIG_ARCH_MEDIATEK) += mt8173-elm.dtb
>   dtb-$(CONFIG_ARCH_MEDIATEK) += mt8173-elm-hana.dtb
> diff --git a/arch/arm64/boot/dts/mediatek/mt7986b-rfb.dts b/arch/arm64/boot/dts/mediatek/mt7986b-rfb.dts
> new file mode 100644
> index 000000000000..95a202505bb2
> --- /dev/null
> +++ b/arch/arm64/boot/dts/mediatek/mt7986b-rfb.dts
> @@ -0,0 +1,26 @@
> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +/*
> + * Copyright (C) 2021 MediaTek Inc.
> + * Author: Sam.Shih <sam.shih@...iatek.com>
> + */
> +
> +/dts-v1/;
> +#include "mt7986b.dtsi"
> +
> +/ {
> +	model = "MediaTek MT7986b RFB";
> +	compatible = "mediatek,mt7986b-rfb";
> +
> +	aliases {
> +		serial0 = &uart0;
> +	};
> +
> +	chosen {
> +		stdout-path = "serial0:115200n8";
> +		bootargs = "earlycon=uart8250,mmio32,0x11002000 swiotlb=512";
> +	};
> +};
> +
> +&uart0 {
> +	status = "okay";
> +};

We are missing a memory node here. I wonder how the board was able to boot 
without memory. Did you test this series?

Regards,
Matthias

> diff --git a/arch/arm64/boot/dts/mediatek/mt7986b.dtsi b/arch/arm64/boot/dts/mediatek/mt7986b.dtsi
> new file mode 100644
> index 000000000000..2b8e0a382398
> --- /dev/null
> +++ b/arch/arm64/boot/dts/mediatek/mt7986b.dtsi
> @@ -0,0 +1,149 @@
> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +/*
> + * Copyright (C) 2021 MediaTek Inc.
> + * Author: Sam.Shih <sam.shih@...iatek.com>
> + */
> +
> +#include <dt-bindings/interrupt-controller/irq.h>
> +#include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +/ {
> +	compatible = "mediatek,mt7986b";
> +	interrupt-parent = <&gic>;
> +	#address-cells = <2>;
> +	#size-cells = <2>;
> +
> +	system_clk: dummy40m {
> +		compatible = "fixed-clock";
> +		clock-frequency = <40000000>;
> +		#clock-cells = <0>;
> +	};
> +
> +	cpus {
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +		cpu0: cpu@0 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a53";
> +			enable-method = "psci";
> +			reg = <0x0>;
> +			#cooling-cells = <2>;
> +		};
> +
> +		cpu1: cpu@1 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a53";
> +			enable-method = "psci";
> +			reg = <0x1>;
> +			#cooling-cells = <2>;
> +		};
> +
> +		cpu2: cpu@2 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a53";
> +			enable-method = "psci";
> +			reg = <0x2>;
> +			#cooling-cells = <2>;
> +		};
> +
> +		cpu3: cpu@3 {
> +			device_type = "cpu";
> +			enable-method = "psci";
> +			compatible = "arm,cortex-a53";
> +			reg = <0x3>;
> +			#cooling-cells = <2>;
> +		};
> +	};
> +
> +	psci {
> +		compatible  = "arm,psci-0.2";
> +		method      = "smc";
> +	};
> +
> +	reserved-memory {
> +		#address-cells = <2>;
> +		#size-cells = <2>;
> +		ranges;
> +		/* 192 KiB reserved for ARM Trusted Firmware (BL31) */
> +		secmon_reserved: secmon@...00000 {
> +			reg = <0 0x43000000 0 0x30000>;
> +			no-map;
> +		};
> +	};
> +
> +	timer {
> +		compatible = "arm,armv8-timer";
> +		interrupt-parent = <&gic>;
> +		interrupts = <GIC_PPI 13 IRQ_TYPE_LEVEL_LOW>,
> +			     <GIC_PPI 14 IRQ_TYPE_LEVEL_LOW>,
> +			     <GIC_PPI 11 IRQ_TYPE_LEVEL_LOW>,
> +			     <GIC_PPI 10 IRQ_TYPE_LEVEL_LOW>;
> +	};
> +
> +	soc {
> +		#address-cells = <2>;
> +		#size-cells = <2>;
> +		compatible = "simple-bus";
> +		ranges;
> +
> +		gic: interrupt-controller@...0000 {
> +			compatible = "arm,gic-v3";
> +			#interrupt-cells = <3>;
> +			interrupt-parent = <&gic>;
> +			interrupt-controller;
> +			reg = <0 0x0c000000 0 0x10000>,  /* GICD */
> +			      <0 0x0c080000 0 0x80000>,  /* GICR */
> +			      <0 0x0c400000 0 0x2000>,   /* GICC */
> +			      <0 0x0c410000 0 0x1000>,   /* GICH */
> +			      <0 0x0c420000 0 0x2000>;   /* GICV */
> +			interrupts = <GIC_PPI 9 IRQ_TYPE_LEVEL_HIGH>;
> +		};
> +
> +		watchdog: watchdog@...1c000 {
> +			compatible = "mediatek,mt7986-wdt",
> +				     "mediatek,mt6589-wdt";
> +			reg = <0 0x1001c000 0 0x1000>;
> +			interrupts = <GIC_SPI 110 IRQ_TYPE_LEVEL_HIGH>;
> +			#reset-cells = <1>;
> +			status = "disabled";
> +		};
> +
> +		trng: trng@...0f000 {
> +			compatible = "mediatek,mt7986-rng",
> +				     "mediatek,mt7623-rng";
> +			reg = <0 0x1020f000 0 0x100>;
> +			clocks = <&system_clk>;
> +			clock-names = "rng";
> +			status = "disabled";
> +		};
> +
> +		uart0: serial@...02000 {
> +			compatible = "mediatek,mt7986-uart",
> +				     "mediatek,mt6577-uart";
> +			reg = <0 0x11002000 0 0x400>;
> +			interrupts = <GIC_SPI 123 IRQ_TYPE_LEVEL_HIGH>;
> +			clocks = <&system_clk>;
> +			status = "disabled";
> +		};
> +
> +		uart1: serial@...03000 {
> +			compatible = "mediatek,mt7986-uart",
> +				     "mediatek,mt6577-uart";
> +			reg = <0 0x11003000 0 0x400>;
> +			interrupts = <GIC_SPI 124 IRQ_TYPE_LEVEL_HIGH>;
> +			clocks = <&system_clk>;
> +			status = "disabled";
> +		};
> +
> +		uart2: serial@...04000 {
> +			compatible = "mediatek,mt7986-uart",
> +				     "mediatek,mt6577-uart";
> +			reg = <0 0x11004000 0 0x400>;
> +			interrupts = <GIC_SPI 125 IRQ_TYPE_LEVEL_HIGH>;
> +			clocks = <&system_clk>;
> +			status = "disabled";
> +		};
> +
> +	};
> +
> +};
> 

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