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Date: Fri, 11 Apr 2014 11:07:35 +0200 From: Matthias Brugger <matthias.bgg@...il.com> To: Olof Johansson <olof@...om.net> Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>, Mark Rutland <mark.rutland@....com>, Ian Campbell <ijc+devicetree@...lion.org.uk>, Kumar Gala <galak@...eaurora.org>, Randy Dunlap <rdunlap@...radead.org>, Russell King - ARM Linux <linux@....linux.org.uk>, Daniel Lezcano <daniel.lezcano@...aro.org>, Thomas Gleixner <tglx@...utronix.de>, Thierry Reding <thierry.reding@...il.com>, Florian Vaussard <florian.vaussard@...l.ch>, Jonathan Cameron <jic23@...nel.org>, Jason Cooper <jason@...edaemon.net>, Andrew Lunn <andrew@...n.ch>, Silvio F <silvio.fricke@...il.com>, Heiko Stübner <heiko.stuebner@...com>, Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>, "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>, "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org> Subject: Re: [PATCH 1/4] clocksource: Add support for the Mediatek SoCs 2014-04-09 23:52 GMT+02:00 Olof Johansson <olof@...om.net>: > Hi, > > On Wed, Apr 9, 2014 at 12:45 PM, Matthias Brugger > <matthias.bgg@...il.com> wrote: >> This patch adds a clock source and clock event for the timer found >> on the Mediatek SoCs. >> >> The Mediatek General Porpose Timer block provides five 32 bit timers and >> one 64 bit timer. >> >> Two 32 bit timers are used: >> TIMER1: clock events supporting periodic and oneshot events >> TIMER2: clock source configured as a free running counter >> >> The General Porpose Timer block can be run with two clocks. A 13 MHz system >> clock and the RTC clock running at 32 KHz. This implementation uses the system >> clock. > > Hm, are you planning on using these on the Cortex-A7-based and newer > SoCs? On those, the arm generic timers should be available, and you > might be better off just using those there. I'm a bit puzzled about the timer naming. Are the arm generic timers the one used by ARM_ARCH_TIMER, or are they different ones? > > Of course, you'll still need these for the A9-based platforms, so the > driver might very well be needed anyway. Some of the earlier patches > seem to be for A7-based systems so I'm not sure what you're primarily > working on here. :) I'm working on a Cortex-A7 based platform. But ARM_ARCH_TIMER seems to get no clocking. Initializing the timer fails with: Architected timer frequency not available That's why I use the SoC timer. > > > -Olof -- motzblog.wordpress.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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