From: arnd@arndb•de (Arnd Bergmann)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v4 04/14] mfd: Add Samsung PWM/timer master driver
Date: Fri, 5 Apr 2013 21:54:21 +0200 [thread overview]
Message-ID: <201304052154.21361.arnd@arndb.de> (raw)
In-Reply-To: <19231120.yHlZtTPUMd@amdc1227>
On Friday 05 April 2013, Tomasz Figa wrote:
> > I don't think anyone ever suggested using a private API though.
>
> I must have gotten the last paragraph of
> http://article.gmane.org/gmane.linux.kernel.samsung-soc/16638
> wrong then. For me it seemed like the timer driver would expose a private API
> to the PWM driver.
Yes, sorry I wasn't clear enough. I meant a register-level interface
exposed from the base driver, not a high-level interface like you
did.
> > I think
> > it's ok if the driver lives in drivers/mfd when it doesn't fit anywhere
> > else easily, but you should really register it to the pwm subsystem to
> > expose that functionality, not export functions that can be used by
> > a pwm shim driver, which even seems to be missing from the series.
>
> Anyway, using PWM API in a clocksource driver that needs to be running very
> early (before any initcalls get called) seems a bit weird for me, especially
> when PWM API doesn't provide such fine grained control over PWM timers that is
> required in the clocksource drivers.
Exactly, that's why you should have a regular PWM driver that gets loaded
at a convenient time and just uses an interface exported by the base driver
to access the common registers.
Arnd
next prev parent reply other threads:[~2013-04-05 19:54 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-04 16:36 [PATCH v4 00/14] ARM: samsung-time: Prepare for multiplatform support Tomasz Figa
2013-04-04 16:36 ` [PATCH v4 01/14] ARM: SAMSUNG: Move samsung-time to drivers/clocksource Tomasz Figa
2013-04-04 16:36 ` [PATCH v4 02/14] clocksource: samsung-time: Drop useless defines from public header Tomasz Figa
2013-04-04 16:37 ` [PATCH v4 03/14] clocksource: samsung-time: Use local register definitions Tomasz Figa
2013-04-04 16:37 ` [PATCH v4 04/14] mfd: Add Samsung PWM/timer master driver Tomasz Figa
2013-04-05 16:39 ` Samuel Ortiz
2013-04-05 16:53 ` Tomasz Figa
2013-04-05 17:05 ` Arnd Bergmann
2013-04-05 17:35 ` Tomasz Figa
2013-04-05 19:54 ` Arnd Bergmann [this message]
2013-04-05 22:24 ` Tomasz Figa
2013-04-08 16:53 ` Tomasz Figa
2013-04-10 22:35 ` Arnd Bergmann
2013-04-11 16:28 ` Mark Brown
2013-04-11 16:44 ` Tomasz Figa
2013-04-11 21:08 ` Arnd Bergmann
2013-04-04 16:37 ` [PATCH v4 05/14] ARM: SAMSUNG: Unify base address definitions of timer block Tomasz Figa
2013-04-04 16:37 ` [PATCH v4 06/14] ARM: SAMSUNG: Add new PWM platform device Tomasz Figa
2013-04-04 16:37 ` [PATCH v4 07/14] ARM: SAMSUNG: Set PWM platform data Tomasz Figa
2013-04-04 16:37 ` [PATCH v4 08/14] clocksource: samsung-time: Use Samsung PWM/timer master driver Tomasz Figa
2013-04-04 16:37 ` [PATCH v4 09/14] clocksource: samsung-time: Use variant data to get SoC-specific bits Tomasz Figa
2013-04-04 16:37 ` [PATCH v4 10/14] clocksource: samsung-time: Use master driver to configure dividers Tomasz Figa
2013-04-04 16:37 ` [PATCH v4 11/14] clocksource: samsung-time: Use clk_prepare_enable Tomasz Figa
2013-04-04 16:37 ` [PATCH v4 12/14] clocksource: samsung-time: Use master driver to control PWM channels Tomasz Figa
2013-04-04 16:37 ` [PATCH v4 13/14] clocksource: samsung-time: Move IRQ mask/ack handling to the driver Tomasz Figa
2013-04-04 16:37 ` [PATCH v4 14/14] ARM: SAMSUNG: Remove unused PWM timer IRQ chip code Tomasz Figa
2013-04-04 23:15 ` [PATCH v4 00/14] ARM: samsung-time: Prepare for multiplatform support Heiko Stübner
2013-04-05 10:33 ` Tomasz Figa
2013-04-05 22:57 ` Tomasz Figa
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