linux-kernel - Re: [PATCH 3/4] arm64: dts: rockchip: Add base DT for rk3528 SoC

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Message-ID: <Zq-AFWYaqu7zGuz-@ziyaolaptop.my.domain>
Date: Sun, 4 Aug 2024 21:20:21 +0800
From: Yao Zi <ziyao@...root.org>
To: Krzysztof Kozlowski <krzk@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>,
	Chris Morgan <macromorgan@...mail.com>,
	Jonas Karlman <jonas@...boo.se>, Tim Lunn <tim@...thertop.org>,
	Andy Yan <andyshrk@....com>,
	Muhammed Efe Cetin <efectn@...tonmail.com>,
	Jagan Teki <jagan@...eble.ai>, Dragan Simic <dsimic@...jaro.org>,
	Ondrej Jirman <megi@....cz>
Cc: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org
Subject: Re: [PATCH 3/4] arm64: dts: rockchip: Add base DT for rk3528 SoC

On Sun, Aug 04, 2024 at 12:05:11PM +0200, Krzysztof Kozlowski wrote:
> On 03/08/2024 14:55, Yao Zi wrote:
> > This initial device tree describes CPU, interrupts and UART on the chip
> > and is able to boot into basic kernel with only UART. Cache information
> > is omitted for now as there is no precise documentation. Support for
> > other features will be added later.
> > 
> > Signed-off-by: Yao Zi <ziyao@...root.org>
> > ---
> >  arch/arm64/boot/dts/rockchip/rk3528.dtsi | 182 +++++++++++++++++++++++
> >  1 file changed, 182 insertions(+)
> >  create mode 100644 arch/arm64/boot/dts/rockchip/rk3528.dtsi
> > 
> > diff --git a/arch/arm64/boot/dts/rockchip/rk3528.dtsi b/arch/arm64/boot/dts/rockchip/rk3528.dtsi
> > new file mode 100644
> > index 000000000000..77687d9e7e80
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/rockchip/rk3528.dtsi
> > @@ -0,0 +1,182 @@
> > +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> > +/*
> > + * Copyright (c) 2022 Rockchip Electronics Co., Ltd.
> > + * Copyright (c) 2024 Yao Zi <ziyao@...root.org>
> > + */
> > +
> > +#include <dt-bindings/interrupt-controller/arm-gic.h>
> > +#include <dt-bindings/interrupt-controller/irq.h>
> > +
> > +/ {
> > +	compatible = "rockchip,rk3528";
> > +
> > +	interrupt-parent = <&gic>;
> > +	#address-cells = <2>;
> > +	#size-cells = <2>;
> > +
> > +	aliases {
> > +		serial0 = &uart0;
> > +		serial1 = &uart1;
> > +		serial2 = &uart2;
> > +		serial3 = &uart3;
> > +		serial4 = &uart4;
> > +		serial5 = &uart5;
> > +		serial6 = &uart6;
> > +		serial7 = &uart7;
> > +	};
> > +
> > +	cpus {
> > +		#address-cells = <1>;
> > +		#size-cells = <0>;
> > +
> > +		cpu-map {
> > +			cluster0 {
> > +				core0 {
> > +					cpu = <&cpu0>;
> > +				};
> > +				core1 {
> > +					cpu = <&cpu1>;
> > +				};
> > +				core2 {
> > +					cpu = <&cpu2>;
> > +				};
> > +				core3 {
> > +					cpu = <&cpu3>;
> > +				};
> > +			};
> > +		};
> > +
> > +		cpu0: cpu@0 {
> > +			device_type = "cpu";
> > +			compatible = "arm,cortex-a53";
> > +			reg = <0x0>;
> > +			enable-method = "psci";
> > +		};
> > +
> > +		cpu1: cpu@1 {
> > +			device_type = "cpu";
> > +			compatible = "arm,cortex-a53";
> > +			reg = <0x1>;
> > +			enable-method = "psci";
> > +		};
> > +
> > +		cpu2: cpu@2 {
> > +			device_type = "cpu";
> > +			compatible = "arm,cortex-a53";
> > +			reg = <0x2>;
> > +			enable-method = "psci";
> > +		};
> > +
> > +		cpu3: cpu@3 {
> > +			device_type = "cpu";
> > +			compatible = "arm,cortex-a53";
> > +			reg = <0x3>;
> > +			enable-method = "psci";
> > +		};
> > +	};
> > +
> > +	psci {
> > +		compatible = "arm,psci-1.0", "arm,psci-0.2";
> > +		method = "smc";
> > +	};
> > +
> > +	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)>;
> > +	};
> > +
> > +	xin24m: xin24m {
> 
> Please use name for all fixed clocks which matches current format
> recommendation: 'clock-([0-9]+|[a-z0-9-]+)+'

Will be fixed in next revision.

> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/clock/fixed-clock.yaml?h=v6.11-rc1
> 
> > +		compatible = "fixed-clock";
> > +		#clock-cells = <0>;
> > +		clock-frequency = <24000000>;
> > +		clock-output-names = "xin24m";
> > +	};
> > +
> > +	gic: interrupt-controller@...01000 {
> 
> Why this all is outside of SoC?

Just as Heiko says, device tree for all other Rockchip SoCs don't have
a "soc" node. I didn't know why before but just follow the style.

If you prefer add a soc node, I am willing to.

Best regards,
Yao Zi