linux-kernel - [patch 24/26] timekeeping: Provide adjtimex() for PTP clocks

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Message-ID: <20250513145138.095772163@linutronix.de>
Date: Tue, 13 May 2025 17:13:39 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: netdev@...r.kernel.org,
 Richard Cochran <richardcochran@...il.com>,
 Christopher Hall <christopher.s.hall@...el.com>,
 David Zage <david.zage@...el.com>,
 John Stultz <jstultz@...gle.com>,
 Frederic Weisbecker <frederic@...nel.org>,
 Anna-Maria Behnsen <anna-maria@...utronix.de>,
 Miroslav Lichvar <mlichvar@...hat.com>,
 Werner Abt <werner.abt@...nberg-usa.com>,
 David Woodhouse <dwmw2@...radead.org>,
 Stephen Boyd <sboyd@...nel.org>,
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>,
 Kurt Kanzenbach <kurt@...utronix.de>,
 Nam Cao <namcao@...utronix.de>,
 Alex Gieringer <gieri@...utronix.de>
Subject: [patch 24/26] timekeeping: Provide adjtimex() for PTP clocks

The behaviour is close to clock_adtime(CLOCK_REALTIME) with the
following differences:

  1) ADJ_SETOFFSET adjusts the PTP clock offset
  
  2) ADJ_TAI is not supported

  3) Leap seconds are not supported

  4) PPS is not supported

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 kernel/time/timekeeping.c |   16 ++++++++++++++++
 1 file changed, 16 insertions(+)
---
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -2862,10 +2862,26 @@ static int ptp_clock_set(const clockid_t
 	return 0;
 }
 
+static int ptp_clock_adj(const clockid_t id, struct __kernel_timex *txc)
+{
+	struct tk_data *tkd = ptp_get_tk_data(id);
+	struct adjtimex_result result = { };
+
+	if (!tkd)
+		return -ENODEV;
+
+	/*
+	 * @result is ignored for now as there are neither hrtimers nor a
+	 * RTC related to these PTP clocks.
+	 */
+	return __do_adjtimex(tkd, txc, &result);
+}
+
 const struct k_clock clock_ptp = {
 	.clock_getres		= ptp_get_res,
 	.clock_get_timespec	= ptp_get_timespec,
 	.clock_set		= ptp_clock_set,
+	.clock_adj		= ptp_clock_adj,
 };
 
 static __init void tk_ptp_setup(void)