linux-kernel - Re: [RFC PATCH 12/36] platform: arm64: Move ec devices to an ec subdirectory

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Message-ID: <514df895-e9bc-4855-b18d-29b1949f67cf@arm.com>
Date: Wed, 6 Aug 2025 19:03:13 +0100
From: James Morse <james.morse@....com>
To: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 Rob Herring <robh@...nel.org>, Ben Horgan <ben.horgan@....com>,
 Rohit Mathew <rohit.mathew@....com>,
 Shanker Donthineni <sdonthineni@...dia.com>, Zeng Heng
 <zengheng4@...wei.com>, Lecopzer Chen <lecopzerc@...dia.com>,
 Carl Worth <carl@...amperecomputing.com>,
 shameerali.kolothum.thodi@...wei.com,
 D Scott Phillips OS <scott@...amperecomputing.com>, lcherian@...vell.com,
 bobo.shaobowang@...wei.com, tan.shaopeng@...itsu.com,
 baolin.wang@...ux.alibaba.com, Jamie Iles <quic_jiles@...cinc.com>,
 Xin Hao <xhao@...ux.alibaba.com>, peternewman@...gle.com,
 dfustini@...libre.com, amitsinght@...vell.com,
 David Hildenbrand <david@...hat.com>, Rex Nie <rex.nie@...uarmicro.com>,
 Dave Martin <dave.martin@....com>, Koba Ko <kobak@...dia.com>
Subject: Re: [RFC PATCH 12/36] platform: arm64: Move ec devices to an ec
 subdirectory

Hi Jonathan,

On 21/07/2025 17:32, Jonathan Cameron wrote:
> On Fri, 11 Jul 2025 18:36:24 +0000
> James Morse <james.morse@....com> wrote:
> 
>> commit 363c8aea257 "platform: Add ARM64 platform directory" added a
>> subdirectory for arm64 platform devices, but claims that all such
>> devices must be 'EC like'.
>>
>> The arm64 MPAM driver manages an MMIO interface that appears in memory
>> controllers, caches, IOMMU and connection points on the interconnect.
>> It doesn't fit into any existing subsystem.
>>
>> It would be convenient to use this subdirectory for drivers for other
>> arm64 platform devices which aren't closely coupled to the architecture
>> code and don't fit into any existing subsystem.
>>
>> Move the existing code and maintainer entries to be under
>> drivers/platform/arm64/ec. The MPAM driver will be added under
>> drivers/platform/arm64/mpam.

>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 4bac4ea21b64..bea01d413666 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -3549,15 +3549,15 @@ S:	Maintained
>>  F:	arch/arm64/boot/Makefile
>>  F:	scripts/make_fit.py
>>  
>> -ARM64 PLATFORM DRIVERS
>> -M:	Hans de Goede <hansg@...nel.org>
>> +ARM64 EC PLATFORM DRIVERS
>> +M:	Hans de Goede <hdegoede@...hat.com>
> 
> Smells like a rebase error as Hans' email address chagned
> to the kernel.org one in the 6.16 cycle.

Bother - yes, that's exactly what happened.


>>  M:	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
>>  R:	Bryan O'Donoghue <bryan.odonoghue@...aro.org>
>>  L:	platform-driver-x86@...r.kernel.org
>>  S:	Maintained
>>  Q:	https://patchwork.kernel.org/project/platform-driver-x86/list/
>>  T:	git git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git
>> -F:	drivers/platform/arm64/
>> +F:	drivers/platform/arm64/ec

> Other than that looks sensible to me but obviously needs tags from Hans or Ilpo.


Thanks,

James