linux-kernel - Re: [PATCH 1/4] clocksource: Add support for the Mediatek SoCs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CABuKBeKr77qJwusoTgjR2yOspWbi6Exvt5i8WPc5tjd7fez-YA@mail.gmail.com>
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/