linux-kernel - Re: [PATCH 4/8] arm64: dts: morello: Add support for soc dts

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Message-ID: <0ebfe23b-be90-4007-babe-02fc6476869a@arm.com>
Date: Thu, 19 Dec 2024 17:20:09 +0000
From: Vincenzo Frascino <vincenzo.frascino@....com>
To: Krzysztof Kozlowski <krzk@...nel.org>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Cc: Sudeep Holla <sudeep.holla@....com>, Rob Herring <robh@...nel.org>
Subject: Re: [PATCH 4/8] arm64: dts: morello: Add support for soc dts



On 14/12/2024 10:12, Krzysztof Kozlowski wrote:
> On 13/12/2024 17:32, Vincenzo Frascino wrote:
>> The Morello architecture is an experimental extension to Armv8.2-A,
>> which extends the AArch64 state with the principles proposed in
>> version 7 of the Capability Hardware Enhanced RISC Instructions
>> (CHERI) ISA.
>>
>> Introduce Morello SoC dts.
> 
> So Morello is an architecture, not a board or platform? You cannot have
> both...
> 
> 

So, Morello is an architecture an SoC and a platform.

To distinguish them I propose:
- arm,morello for # the SoC
- arm,morello-sdp # for the platform.

sdp: Software Development Platform.

> 
> 
>>
>> Cc: Sudeep Holla <sudeep.holla@....com>
>> Cc: Rob Herring <robh@...nel.org>
>> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>
>> ---
>>  arch/arm64/boot/dts/arm/morello-soc.dts | 267 ++++++++++++++++++++++++
>>  1 file changed, 267 insertions(+)
>>  create mode 100644 arch/arm64/boot/dts/arm/morello-soc.dts
>>
>> diff --git a/arch/arm64/boot/dts/arm/morello-soc.dts b/arch/arm64/boot/dts/arm/morello-soc.dts
>> new file mode 100644
>> index 000000000000..3c5247121e4d
>> --- /dev/null
>> +++ b/arch/arm64/boot/dts/arm/morello-soc.dts
>> @@ -0,0 +1,267 @@
>> +// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
>> +/*
>> + * Copyright (c) 2021-2024, Arm Limited. All rights reserved.
>> +
>> + */
>> +
>> +/dts-v1/;
>> +#include "morello.dtsi"
>> +
>> +/ {
>> +	model = "Arm Morello System Development Platform";
>> +
>> +	chosen {
>> +		stdout-path = "serial0:115200n8";
>> +	};
>> +
>> +	reserved-memory {
>> +		#address-cells = <2>;
>> +		#size-cells = <2>;
>> +		ranges;
>> +
>> +		secure-firmware@...00000 {
>> +			reg = <0 0xff000000 0 0x01000000>;
>> +			no-map;
>> +		};
>> +	};
>> +
>> +	cpus {
>> +		#address-cells = <2>;
>> +		#size-cells = <0>;
>> +		cpu0: cpu0@0 {
>> +			compatible = "arm,neoverse-n1";
>> +			reg = <0x0 0x0>;
>> +			device_type = "cpu";
>> +			enable-method = "psci";
>> +			clocks = <&scmi_dvfs 0>;
>> +		};
>> +		cpu1: cpu1@100 {
>> +			compatible = "arm,neoverse-n1";
>> +			reg = <0x0 0x100>;
>> +			device_type = "cpu";
>> +			enable-method = "psci";
>> +			clocks = <&scmi_dvfs 0>;
>> +		};
>> +		cpu2: cpu2@...00 {
>> +			compatible = "arm,neoverse-n1";
>> +			reg = <0x0 0x10000>;
>> +			device_type = "cpu";
>> +			enable-method = "psci";
>> +			clocks = <&scmi_dvfs 1>;
>> +		};
>> +		cpu3: cpu3@...00 {
>> +			compatible = "arm,neoverse-n1";
>> +			reg = <0x0 0x10100>;
>> +			device_type = "cpu";
>> +			enable-method = "psci";
>> +			clocks = <&scmi_dvfs 1>;
>> +		};
>> +	};
>> +
>> +	/* The first bank of memory, memory map is actually provided by UEFI. */
>> +	memory@...00000 {
>> +		device_type = "memory";
>> +		/* [0x80000000-0xffffffff] */
>> +		reg = <0x00000000 0x80000000 0x0 0x7F000000>;
>> +	};
>> +
>> +	memory@...0000000 {
>> +		device_type = "memory";
>> +		/* [0x8080000000-0x83f7ffffff] */
>> +		reg = <0x00000080 0x80000000 0x3 0x78000000>;
>> +	};
>> +
>> +	smmu_pcie: iommu@...00000 {
> 
> This all is weird. MMIO nodes outside of soc, soc pieces defined in DTS
> instead of DTSI.
> 
> Please look first how all other DTS and DTSI are done. Also carefully
> read DTS coding style.
> 
>

All right, will do.


> 
> Best regards,
> Krzysztof

-- 
Regards,
Vincenzo