linux-kernel - Re: [PATCH v5 6/7] clocksource/drivers/exynos

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Message-ID: <f1c5a4b6-3e75-418d-b7d8-7899dcd28ca3@linaro.org>
Date: Mon, 17 Nov 2025 12:46:24 +0100
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: William McVicker <willmcvicker@...gle.com>,
 Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Russell King <linux@...linux.org.uk>,
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
 Thomas Gleixner <tglx@...utronix.de>, Krzysztof Kozlowski <krzk@...nel.org>,
 Alim Akhtar <alim.akhtar@...sung.com>, Ingo Molnar <mingo@...nel.org>,
 Peter Griffin <peter.griffin@...aro.org>,
 Youngmin Nam <youngmin.nam@...sung.com>, Donghoon Yu <hoony.yu@...sung.com>,
 Rob Herring <robh@...nel.org>, Saravana Kannan <saravanak@...gle.com>,
 John Stultz <jstultz@...gle.com>, Tudor Ambarus <tudor.ambarus@...aro.org>,
 André Draszik <andre.draszik@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, linux-samsung-soc@...r.kernel.org,
 kernel-team@...roid.com, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 6/7] clocksource/drivers/exynos_mct: Add module support


Hi Will,

On 10/24/25 17:53, William McVicker wrote:
> On 10/24/2025, Marek Szyprowski wrote:
>> On 23.10.2025 22:52, Will McVicker wrote:
>>> From: Donghoon Yu <hoony.yu@...sung.com>

[ ... ]
>> Sorry, but this still won't work on legacy ARM 32bit systems with MCT as
>> the only clocksource, which needs a driver available very early (that's
>> why it used TIMER_OF_DECLAREmacro). You need to make it conditional
>> under CONFIG_ARM:
> 
> Can we rely on the bootloader to setup the MCT timer and then hand-off at boot
> once the driver is initialized?
> 
> Daniel was working on a solution to transparently handle calling
> TIMER_OF_DECLARE() when a timer driver can be configured as both a module or
> built-in here:
> 
>    https://lore.kernel.org/all/20250625085715.889837-1-daniel.lezcano@linaro.org/
> 
> Daniel, do you have plans to finish that? In the meantime, can we go with the
> `#if CONFIG_ARM` solution?

I have a plan to finish that but it is low in my priority list. So I 
guess we can go for the CONFIG_ARM solution in the meantime.



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