linux-kernel - Re: [PATCH v4 2/7] clocksource/drivers: Add EcoNet Timer HPT driver

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Message-ID: <7c08cc9e-f39f-490c-85fe-5738656380e5@linaro.org>
Date: Tue, 6 May 2025 10:54:09 +0200
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: Caleb James DeLisle <cjd@...ns.fr>
Cc: linux-mips@...r.kernel.org, tglx@...utronix.de, robh@...nel.org,
 krzk+dt@...nel.org, conor+dt@...nel.org, tsbogend@...ha.franken.de,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 benjamin.larsson@...exis.eu, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v4 2/7] clocksource/drivers: Add EcoNet Timer HPT driver

On 05/05/2025 20:09, Caleb James DeLisle wrote:
> 
> On 05/05/2025 18:36, Daniel Lezcano wrote:
>> On Wed, Apr 30, 2025 at 01:34:28PM +0000, Caleb James DeLisle wrote:
>>> Introduce a clocksource driver for the so-called high-precision timer 
>>> (HPT)
>>> in the EcoNet EN751221 MIPS SoC.
>> As a new driver, please document the timer (up - down ?, SPI/PPI, etc
>> ...) that will help to understand the code more easily, especially the
>> reg_* functions (purposes?).
> 
> 
> Sure thing, I can elaborate the comment in the header of
> timer-econet-en751221.c. Let me know if you'd like it described
> somewhere else as well, such as the help of config ECONET_EN751221_TIMER.

It is ok in the changelog, so it is possible to get the description when 
looking for the patch introducing the new timer.

[ ... ]

>>> +
>>> +    cpuhp_setup_state(CPUHP_AP_MIPS_GIC_TIMER_STARTING,
>>> +              "clockevents/en75/timer:starting",
>>> +              cevt_init_cpu, NULL);
>> cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, ... ) ?
> 
> I see that Ingenic does this. This is the only timer so until it's up,
> sleeping causes a hang. If sleeping is prior to CPUHP_AP_ONLINE_DYN is
> considered a bug then this should be okay, but I'm not informed enough
> to say whether that is the case so I'll follow your guidance here.

Hmm, hard to say without the platform. May be just give a try with 
CPUHP_AP_ONLINE_DYN to check if it works otherwise stick on 
CPUHP_AP_MIPS_GIC_TIMER_STARTING as it is already defined ?

[ ... ]


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