From: Anson Huang <Anson.Huang@nxp•com>
To: robh+dt@kernel•org, mark.rutland@arm•com, shawnguo@kernel•org,
s.hauer@pengutronix•de, kernel@pengutronix•de,
festevam@gmail•com, daniel.lezcano@linaro•org,
tglx@linutronix•de, leonard.crestez@nxp•com,
daniel.baluta@nxp•com, ping.bai@nxp•com, jun.li@nxp•com,
l.stach@pengutronix•de, abel.vesa@nxp•com, ccaione@baylibre•com,
andrew.smirnov@gmail•com, angus@akkea•ca, agx@sigxcpu•org,
devicetree@vger•kernel.org, linux-arm-kernel@lists•infradead.org,
linux-kernel@vger•kernel.org
Cc: Linux-imx@nxp•com
Subject: [PATCH V6 1/4] clocksource: imx-sysctr: Add internal clock divider handle
Date: Thu, 15 Aug 2019 20:38:42 -0400 [thread overview]
Message-ID: <1565915925-21009-1-git-send-email-Anson.Huang@nxp.com> (raw)
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@nxp•com>
---
No changes.
---
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;
--
2.7.4
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next reply other threads:[~2019-08-16 0:58 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-16 0:38 Anson Huang [this message]
2019-08-16 0:38 ` [PATCH V6 2/4] arm64: dts: imx8mm: Add system counter node Anson Huang
2019-08-16 0:38 ` [PATCH V6 3/4] arm64: dts: imx8mq: " Anson Huang
2019-08-16 0:38 ` [PATCH V6 4/4] arm64: dts: imx8mm: Enable cpu-idle driver Anson Huang
2019-08-16 9:59 ` Daniel Lezcano
2019-08-16 10:08 ` Anson Huang
2019-08-16 10:37 ` Anson Huang
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