Subject: Re: [PATCH v2 3/6] arm64: dts: fsl: Add device tree for S32V234-EVB

From: Shawn Guo <[email-masked]>
Date: Mon, 19 Aug 2019 10:58:17 +0200

On Fri, Aug 09, 2019 at 11:29:12AM +0000, Stefan-gabriel Mirea wrote:
> From: Stoica Cosmin-Stefan <[email-masked]>
> 
> Add initial version of device tree for S32V234-EVB, including nodes for the
> 4 Cortex-A53 cores, AIPS bus with UART modules, ARM architected timer and
> Generic Interrupt Controller (GIC).
> 
> Keep SoC level separate from board level to let future boards with this SoC
> share common properties, while the dts files will keep board-dependent
> properties.
> 
> Signed-off-by: Stoica Cosmin-Stefan <[email-masked]>
> Signed-off-by: Mihaela Martinas <[email-masked]>
> Signed-off-by: Dan Nica <[email-masked]>
> Signed-off-by: Larisa Grigore <[email-masked]>
> Signed-off-by: Phu Luu An <[email-masked]>
> Signed-off-by: Stefan-Gabriel Mirea <[email-masked]>
> ---
>  arch/arm64/boot/dts/freescale/Makefile        |   2 +
>  .../boot/dts/freescale/fsl-s32v234-evb.dts    |  24 ++++

The 'fsl-' prefix can be saved here, so that we can distinguish three
families by starting string: imx??? for i.MX, fsl-??? for LayerScape,
and s32??? for S32.

>  .../arm64/boot/dts/freescale/fsl-s32v234.dtsi | 130 ++++++++++++++++++
>  3 files changed, 156 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/freescale/fsl-s32v234-evb.dts
>  create mode 100644 arch/arm64/boot/dts/freescale/fsl-s32v234.dtsi
> 
> diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
> index c043aca66572..3af29b58a833 100644
> --- a/arch/arm64/boot/dts/freescale/Makefile
> +++ b/arch/arm64/boot/dts/freescale/Makefile
> @@ -26,3 +26,5 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mq-librem5-devkit.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx8mq-zii-ultra-rmb3.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx8mq-zii-ultra-zest.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx8qxp-mek.dtb
> +
> +dtb-$(CONFIG_ARCH_S32) += fsl-s32v234-evb.dtb
> diff --git a/arch/arm64/boot/dts/freescale/fsl-s32v234-evb.dts b/arch/arm64/boot/dts/freescale/fsl-s32v234-evb.dts
> new file mode 100644
> index 000000000000..92bf6c5563a3
> --- /dev/null
> +++ b/arch/arm64/boot/dts/freescale/fsl-s32v234-evb.dts
> @@ -0,0 +1,24 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright 2015-2016 Freescale Semiconductor, Inc.
> + * Copyright 2016-2017 NXP
> + */
> +
> +/dts-v1/;
> +#include "fsl-s32v234.dtsi"
> +
> +/ {
> +	compatible = "fsl,s32v234-evb", "fsl,s32v234";
> +
> +	chosen {
> +		stdout-path = "serial0:115200n8";
> +	};
> +};
> +
> +&uart0 {
> +	status = "okay";
> +};
> +
> +&uart1 {
> +	status = "okay";
> +};
> diff --git a/arch/arm64/boot/dts/freescale/fsl-s32v234.dtsi b/arch/arm64/boot/dts/freescale/fsl-s32v234.dtsi
> new file mode 100644
> index 000000000000..6d686d3ba997
> --- /dev/null
> +++ b/arch/arm64/boot/dts/freescale/fsl-s32v234.dtsi
> @@ -0,0 +1,130 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright 2015-2016 Freescale Semiconductor, Inc.
> + * Copyright 2016-2018 NXP
> + */
> +
> +/memreserve/ 0x80000000 0x00010000;
> +
> +/ {
> +	model = "Freescale S32V234";

The 'model' is usually used in board level DTS to describe the board.

> +	compatible = "fsl,s32v234";
> +	interrupt-parent = <&gic>;
> +	#address-cells = <2>;
> +	#size-cells = <2>;
> +
> +	aliases {
> +		serial0 = &uart0;
> +		serial1 = &uart1;
> +	};
> +
> +	cpus {
> +		#address-cells = <2>;
> +		#size-cells = <0>;
> +
> +		cpu0: cpu@0 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a53";
> +			reg = <0x0 0x0>;
> +			enable-method = "spin-table";
> +			cpu-release-addr = <0x0 0x80000000>;
> +			next-level-cache = <&cluster0_l2_cache>;
> +		};

Please have a newline between nodes.

> +		cpu1: cpu@1 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a53";
> +			reg = <0x0 0x1>;
> +			enable-method = "spin-table";
> +			cpu-release-addr = <0x0 0x80000000>;
> +			next-level-cache = <&cluster0_l2_cache>;
> +		};
> +		cpu2: cpu@100 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a53";
> +			reg = <0x0 0x100>;
> +			enable-method = "spin-table";
> +			cpu-release-addr = <0x0 0x80000000>;
> +			next-level-cache = <&cluster1_l2_cache>;
> +		};
> +		cpu3: cpu@101 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a53";
> +			reg = <0x0 0x101>;
> +			enable-method = "spin-table";
> +			cpu-release-addr = <0x0 0x80000000>;
> +			next-level-cache = <&cluster1_l2_cache>;
> +		};
> +
> +		cluster0_l2_cache: l2-cache0 {
> +			compatible = "cache";
> +		};
> +
> +		cluster1_l2_cache: l2-cache1 {
> +			compatible = "cache";
> +		};
> +	};
> +
> +	soc {
> +		#address-cells = <2>;
> +		#size-cells = <2>;
> +		compatible = "simple-bus";
> +		interrupt-parent = <&gic>;
> +		ranges;
> +
> +		aips0: aips-bus@40000000 {
> +			compatible = "simple-bus";
> +			#address-cells = <2>;
> +			#size-cells = <2>;
> +			interrupt-parent = <&gic>;
> +			reg = <0x0 0x40000000 0x0 0x7D000>;
> +			ranges;
> +
> +			uart0: serial@40053000 {
> +				compatible = "fsl,s32-linflexuart";
> +				reg = <0x0 0x40053000 0x0 0x1000>;
> +				interrupts = <0 59 1>;

Please use GIC_SPI and IRQ_TYPE_xxx defines to make it more readable.

> +				status = "disabled";
> +			};
> +		};
> +
> +		aips1: aips-bus@40080000 {
> +			compatible = "simple-bus";
> +			#address-cells = <2>;
> +			#size-cells = <2>;
> +			interrupt-parent = <&gic>;
> +			reg = <0x0 0x40080000 0x0 0x70000>;
> +			ranges;
> +
> +			uart1: serial@400bc000 {
> +				compatible = "fsl,s32-linflexuart";
> +				reg = <0x0 0x400bc000 0x0 0x1000>;
> +				interrupts = <0 60 1>;
> +				status = "disabled";
> +			};
> +		};
> +	};
> +
> +	timer {
> +		compatible = "arm,armv8-timer";
> +		interrupts = <1 13 0xf08>,
> +			     <1 14 0xf08>,
> +			     <1 11 0xf08>,
> +			     <1 10 0xf08>;
> +		/* clock-frequency might be modified by u-boot, depending on the
> +		 * chip version.
> +		 */
> +		clock-frequency = <10000000>;
> +	};
> +
> +	gic: interrupt-controller@7d001000 {
> +		compatible = "arm,cortex-a15-gic", "arm,cortex-a9-gic";
> +		#interrupt-cells = <3>;
> +		#address-cells = <0>;
> +		interrupt-controller;
> +		reg = <0 0x7d001000 0 0x1000>,
> +		      <0 0x7d002000 0 0x2000>,
> +		      <0 0x7d004000 0 0x2000>,
> +		      <0 0x7d006000 0 0x2000>;
> +		interrupts = <1 9 0xf04>;
> +	};

We usually put these core platform devices prior to 'soc' node.

Shawn

> +};
> -- 
> 2.22.0

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