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From: Igor Velkov <iav@iav.lv>
To: John Stultz <jstultz@google.com>,
	Thomas Gleixner <tglx@kernel.org>,
	Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Stephen Boyd <sboyd@kernel.org>,
	linux-rtc@vger.kernel.org, linux-kernel@vger.kernel.org,
	Igor Velkov <iav@iav.lv>
Subject: alarmtimer: no way to choose the RTC on boards with two wakeup RTCs
Date: Sat, 10 Oct 2026 07:04:18 +0300	[thread overview]
Message-ID: <179160505804429.3363580.alarmtimer-rtc@iav.lv> (raw)

Hi,

alarmtimer_rtc_add_device() binds to the first registered RTC that has
RTC_FEATURE_ALARM and a wakeup-capable parent, and keeps it. With two such
RTCs the choice follows probe order: ODROID-N2/N2+ (pcf8563 and meson-vrtc),
ODROID-HC4 with its RTC add-on, and 11 rockchip boards in v7.3 DT with a
hym8563/pcf8563 next to an RK808-family PMIC RTC. On HC4 meson-vrtc wins.

I found no DT property, command-line option or sysfs knob to make the choice
explicit. Is there an intended way? If not, where would such a setting
belong, and under what name?

Igor

                 reply	other threads:[~2026-10-10  4:04 UTC|newest]

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