From: Anson.Huang@nxp.com To: catalin.marinas@arm.com, will@kernel.org, robh+dt@kernel.org, mark.rutland@arm.com, shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com, daniel.lezcano@linaro.org, tglx@linutronix.de, leonard.crestez@nxp.com, aisheng.dong@nxp.com, daniel.baluta@nxp.com, ping.bai@nxp.com, l.stach@pengutronix.de, abel.vesa@nxp.com, andrew.smirnov@gmail.com, ccaione@baylibre.com, angus@akkea.ca, agx@sigxcpu.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Cc: Linux-imx@nxp.com Subject: [PATCH V5 1/5] clocksource: imx-sysctr: Add internal clock divider handle Date: Wed, 10 Jul 2019 14:30:52 +0800 [thread overview] Message-ID: <20190710063056.35689-1-Anson.Huang@nxp.com> (raw) From: Anson Huang <Anson.Huang@nxp.com> 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> --- Changes since V4: - to solve the clock driver probed after system counter driver issue, now we can easily switch to use fixed clock defined in DT and get its rate, then divided by 3 to get real clock rate for system counter driver, no need to add "clock-frequency" property in DT. --- 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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From: Anson.Huang@nxp.com To: catalin.marinas@arm.com, will@kernel.org, robh+dt@kernel.org, mark.rutland@arm.com, shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com, daniel.lezcano@linaro.org, tglx@linutronix.de, leonard.crestez@nxp.com, aisheng.dong@nxp.com, daniel.baluta@nxp.com, ping.bai@nxp.com, l.stach@pengutronix.de, abel.vesa@nxp.com, andrew.smirnov@gmail.com, ccaione@baylibre.com, angus@akkea.ca, agx@sigxcpu.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Cc: Linux-imx@nxp.com Subject: [PATCH V5 1/5] clocksource: imx-sysctr: Add internal clock divider handle Date: Wed, 10 Jul 2019 14:30:52 +0800 [thread overview] Message-ID: <20190710063056.35689-1-Anson.Huang@nxp.com> (raw) From: Anson Huang <Anson.Huang@nxp.com> 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> --- Changes since V4: - to solve the clock driver probed after system counter driver issue, now we can easily switch to use fixed clock defined in DT and get its rate, then divided by 3 to get real clock rate for system counter driver, no need to add "clock-frequency" property in DT. --- 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2019-07-10 6:40 UTC|newest] Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-07-10 6:30 Anson.Huang [this message] 2019-07-10 6:30 ` [PATCH V5 1/5] clocksource: imx-sysctr: Add internal clock divider handle Anson.Huang 2019-07-10 6:30 ` [PATCH V5 2/5] arm64: Enable TIMER_IMX_SYS_CTR for ARCH_MXC platforms Anson.Huang 2019-07-10 6:30 ` Anson.Huang 2019-07-22 3:12 ` Shawn Guo 2019-07-22 3:12 ` Shawn Guo 2019-07-10 6:30 ` [PATCH V5 3/5] arm64: dts: imx8mm: Add system counter node Anson.Huang 2019-07-10 6:30 ` Anson.Huang 2019-07-22 3:15 ` Shawn Guo 2019-07-22 3:15 ` Shawn Guo 2019-07-23 2:29 ` Anson Huang 2019-07-23 2:29 ` Anson Huang 2019-07-23 2:29 ` Anson Huang 2019-07-10 6:30 ` [PATCH V5 4/5] arm64: dts: imx8mq: " Anson.Huang 2019-07-10 6:30 ` Anson.Huang 2019-07-10 6:30 ` [PATCH V5 5/5] arm64: dts: imx8mm: Enable cpu-idle driver Anson.Huang 2019-07-10 6:30 ` Anson.Huang 2019-08-15 16:12 ` Daniel Lezcano 2019-08-15 16:12 ` Daniel Lezcano 2019-08-16 1:03 ` Anson Huang 2019-08-16 1:03 ` Anson Huang 2019-08-16 1:03 ` Anson Huang 2019-08-19 7:27 ` Shawn Guo 2019-08-19 7:27 ` Shawn Guo 2019-08-06 1:55 ` [PATCH V5 1/5] clocksource: imx-sysctr: Add internal clock divider handle Anson Huang 2019-08-06 1:55 ` Anson Huang 2019-08-06 1:55 ` Anson Huang 2019-08-06 10:27 ` Daniel Lezcano 2019-08-06 10:27 ` Daniel Lezcano 2019-08-06 10:27 ` Daniel Lezcano
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