linux-kernel - [PATCH 09/20] clocksource/drivers/vf-pit: Register the clocksource from the driver

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Message-ID: <20250705160129.3688026-9-daniel.lezcano@linaro.org>
Date: Sat,  5 Jul 2025 18:01:15 +0200
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: daniel.lezcano@...aro.org,
	tglx@...utronix.de
Cc: ghennadi.procopciuc@....nxp.com,
	S32@....com,
	linux-kernel@...r.kernel.org
Subject: [PATCH 09/20] clocksource/drivers/vf-pit: Register the clocksource from the driver

The function clocksource_mmio_init() uses its own global static
clocksource variable making no possible to have several instances of a
clocksource using this function. In order to support that, let's add
the clocksource structure to the pit structure and use the
clocksource_register_hz() function instead.

Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 drivers/clocksource/timer-vf-pit.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/clocksource/timer-vf-pit.c b/drivers/clocksource/timer-vf-pit.c
index be71c215d641..066d0d2600f4 100644
--- a/drivers/clocksource/timer-vf-pit.c
+++ b/drivers/clocksource/timer-vf-pit.c
@@ -44,6 +44,11 @@ static inline struct pit_timer *ced_to_pit(struct clock_event_device *ced)
 	return container_of(ced, struct pit_timer, ced);
 }
 
+static inline struct pit_timer *cs_to_pit(struct clocksource *cs)
+{
+	return container_of(cs, struct pit_timer, cs);
+}
+
 static inline void pit_timer_enable(struct pit_timer *pit)
 {
 	writel(PITTCTRL_TEN | PITTCTRL_TIE, pit->clkevt_base + PITTCTRL);
@@ -64,6 +69,13 @@ static u64 notrace pit_read_sched_clock(void)
 	return ~readl(clksrc_base + PITCVAL);
 }
 
+static u64 pit_timer_clocksource_read(struct clocksource *cs)
+{
+	struct pit_timer *pit = cs_to_pit(cs);
+
+	return ~(u64)readl(pit->clksrc_base + PITCVAL);
+}
+
 static int __init pit_clocksource_init(struct pit_timer *pit, void __iomem *base,
 				       unsigned long rate)
 {
@@ -73,6 +85,11 @@ static int __init pit_clocksource_init(struct pit_timer *pit, void __iomem *base
 	 * for anyone else who needs them.
 	 */
 	pit->clksrc_base = base + PIT_CH(2);
+	pit->cs.name = "vf-pit";
+	pit->cs.rating = 300;
+	pit->cs.read = pit_timer_clocksource_read;
+	pit->cs.mask = CLOCKSOURCE_MASK(32);
+	pit->cs.flags = CLOCK_SOURCE_IS_CONTINUOUS;
 
 	/* set the max load value and start the clock source counter */
 	writel(0, pit->clksrc_base + PITTCTRL);
@@ -83,8 +100,7 @@ static int __init pit_clocksource_init(struct pit_timer *pit, void __iomem *base
 
 	sched_clock_register(pit_read_sched_clock, 32, rate);
 
-	return clocksource_mmio_init(pit->clksrc_base + PITCVAL, "vf-pit", rate,
-				     300, 32, clocksource_mmio_readl_down);
+	return clocksource_register_hz(&pit->cs, rate);
 }
 
 static int pit_set_next_event(unsigned long delta, struct clock_event_device *ced)
-- 
2.43.0