linux-kernel - [tip: timers/core] clocksource/drivers/imx-sysctr: Add internal clock divider handle

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Date:   Mon, 26 Aug 2019 22:52:13 -0000
From:   tip-bot2 for Anson Huang <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Anson Huang <Anson.Huang@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: [tip: timers/core] clocksource/drivers/imx-sysctr: Add internal clock
 divider handle

The following commit has been merged into the timers/core branch of tip:

Commit-ID:     4419e19d8117dda6bccfbc62090e766f469ff20a
Gitweb:        https://git.kernel.org/tip/4419e19d8117dda6bccfbc62090e766f469ff20a
Author:        Anson Huang <Anson.Huang@....com>
AuthorDate:    Thu, 15 Aug 2019 20:38:42 -04:00
Committer:     Daniel Lezcano <daniel.lezcano@...aro.org>
CommitterDate: Tue, 27 Aug 2019 00:31:39 +02:00

clocksource/drivers/imx-sysctr: Add internal clock divider handle

The system counter block guide states that the base clock is
internally divided by 3 before use, that means the clock input of
system counter defined in DT should be base clock which is normally
from OSC, and then internally divided by 3 before use.

Signed-off-by: Anson Huang <Anson.Huang@....com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 drivers/clocksource/timer-imx-sysctr.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/clocksource/timer-imx-sysctr.c b/drivers/clocksource/timer-imx-sysctr.c
index fd7d680..b7c80a3 100644
--- a/drivers/clocksource/timer-imx-sysctr.c
+++ b/drivers/clocksource/timer-imx-sysctr.c
@@ -20,6 +20,8 @@
 #define SYS_CTR_EN		0x1
 #define SYS_CTR_IRQ_MASK	0x2
 
+#define SYS_CTR_CLK_DIV		0x3
+
 static void __iomem *sys_ctr_base;
 static u32 cmpcr;
 
@@ -134,6 +136,9 @@ static int __init sysctr_timer_init(struct device_node *np)
 	if (ret)
 		return ret;
 
+	/* system counter clock is divided by 3 internally */
+	to_sysctr.of_clk.rate /= SYS_CTR_CLK_DIV;
+
 	sys_ctr_base = timer_of_base(&to_sysctr);
 	cmpcr = readl(sys_ctr_base + CMPCR);
 	cmpcr &= ~SYS_CTR_EN;