From: Alexandre Belloni <alexandre.belloni@bootlin.com>
To: Wolfram Sang <wsa+renesas@sang-engineering.com>,
linux-rtc@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
Miquel Raynal <miquel.raynal@bootlin.com>
Subject: Re: Q: use 1s irqs to overcome alarm minute granularity?
Date: Tue, 25 Feb 2025 11:47:44 +0100 [thread overview]
Message-ID: <2025022510474487653067@mail.local> (raw)
In-Reply-To: <Z72ZFf-3Z78O44nm@ninjato>
Hi,
On 25/02/2025 11:19:01+0100, Wolfram Sang wrote:
> so alarms of the Renesas RZ-N1 RTC can only have one-minute-granularity.
> However, it does have a one-second-interrupt. Has it been tried already
> for some driver to use such an interrupt to emulate second-granularity
> of the alarm? My searches did not yield results so far.
>
> So the idea is, of course, to the let the alarm fire on the minutes.
> Then, enable the second-update irqs until reading the seconds matches
> the requested seconds of the alarm.
I'd say this is probably useless because you will already be awake
anyway so I don't see the clear benefit.
>
> It would not only gain us a better resolution for alarms, but also
> allows for enabling UIE.
This is already something you can do. I admit this has become super
convoluted since Jon switched UIEs to be handled using the alarm
interrupt...
--
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
next prev parent reply other threads:[~2025-02-25 10:47 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-25 10:19 Q: use 1s irqs to overcome alarm minute granularity? Wolfram Sang
2025-02-25 10:24 ` Biju Das
2025-02-25 10:28 ` Wolfram Sang
2025-02-25 10:47 ` Alexandre Belloni [this message]
2025-02-25 10:54 ` Wolfram Sang
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