linux-kernel - Re: [PATCH v6 3/7] clocksource: stm32-lptimer: add support for stm32mp25

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Message-ID: <aBsR7W15mPQiTjCc@mai.linaro.org>
Date: Wed, 7 May 2025 09:55:25 +0200
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: Fabrice Gasnier <fabrice.gasnier@...s.st.com>
Cc: lee@...nel.org, alexandre.torgue@...s.st.com, tglx@...utronix.de,
	ukleinek@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
	jic23@...nel.org, robh@...nel.org, catalin.marinas@....com,
	will@...nel.org, devicetree@...r.kernel.org, wbg@...nel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-iio@...r.kernel.org, linux-pwm@...r.kernel.org,
	olivier.moysan@...s.st.com
Subject: Re: [PATCH v6 3/7] clocksource: stm32-lptimer: add support for
 stm32mp25

On Tue, Apr 29, 2025 at 02:51:29PM +0200, Fabrice Gasnier wrote:
> On stm32mp25, DIER (former IER) must only be modified when the lptimer
> is enabled. On earlier SoCs, it must be only be modified when it is
> disabled. There's also a new DIEROK flag, to ensure register access
> has completed.
> Add a new "set_evt" routine to be used on stm32mp25, called depending
> on the version register, read by the MFD core (LPTIM_VERR).
> 
> Signed-off-by: Patrick Delaunay <patrick.delaunay@...s.st.com>
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...s.st.com>
> ---
> Changes in V6:
> - Fixed warning reported by kernel test robot in
>   https://lore.kernel.org/oe-kbuild-all/202504261456.aCATBoYN-lkp@intel.com/
>   use FIELD_GET() macro
> Changes in V5:
> - Added a delay after timer enable, it needs two clock cycles.
> Changes in V4:
> - Daniel suggests to encapsulate IER write into a separate function
>   that manages the enabling/disabling of the LP timer. In addition,
>   DIEROK and ARROK flags checks have been added. So adopt a new routine
>   to set the event into ARR register and enable the interrupt.
> Changes in V2:
> - rely on fallback compatible as no specific .data is associated to the
>   driver. Use version data from MFD core.
> - Added interrupt enable register access update in (missed in V1)
> ---

Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>
-- 

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