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Tue, 6 Aug 2019 01:55:33 +0000 Received: from DB3PR0402MB3916.eurprd04.prod.outlook.com ([fe80::7cdf:bddc:212c:f77e]) by DB3PR0402MB3916.eurprd04.prod.outlook.com ([fe80::7cdf:bddc:212c:f77e%4]) with mapi id 15.20.2136.018; Tue, 6 Aug 2019 01:55:33 +0000 From: Anson Huang 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" , dl-linux-imx , "daniel.lezcano@linaro.org" , "tglx@linutronix.de" , Leonard Crestez , Aisheng Dong , Daniel Baluta , Jacky Bai , "l.stach@pengutronix.de" , Abel Vesa , "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" Subject: RE: [PATCH V5 1/5] clocksource: imx-sysctr: Add internal clock divider handle Thread-Topic: [PATCH V5 1/5] clocksource: imx-sysctr: Add internal clock divider handle Thread-Index: AQHVNupa/BF0ohbs50COjHmVK/z9Babthhpw Date: Tue, 6 Aug 2019 01:55:32 +0000 Message-ID: References: <20190710063056.35689-1-Anson.Huang@nxp.com> In-Reply-To: <20190710063056.35689-1-Anson.Huang@nxp.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=anson.huang@nxp.com; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Gentle ping... > From: Anson Huang > > 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 > --- > 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