From: Arnd Bergmann <arnd@arndb.de>
To: Thierry Reding <thierry.reding@avionic-design.de>
Cc: Tomasz Figa <tomasz.figa@gmail.com>,
Tomasz Figa <t.figa@samsung.com>,
Thomas Abraham <thomas.abraham@linaro.org>,
Kukjin Kim <kgene.kim@samsung.com>,
Tushar Behera <tushar.behera@linaro.org>,
Deepak Saxena <dsaxena@linaro.org>,
linux-arm-kernel@lists.infradead.org,
linux-samsung-soc@vger.kernel.org,
Olof Johansson <olof@lixom.net>
Subject: Re: [PATCH 00/23] RFC: exynos multiplatform support
Date: Thu, 7 Mar 2013 03:02:46 +0000 [thread overview]
Message-ID: <201303070302.46593.arnd@arndb.de> (raw)
In-Reply-To: <20130306123426.GB17079@avionic-0098.mockup.avionic-design.de>
On Wednesday 06 March 2013, Thierry Reding wrote:
> > Option 2 would probably come down to having a trivial MFD driver exposing
> > a regmap. You can probably reuse drivers/mfd/syscon.c for this and make
> > the node compatible with "syscon" to designate the clock registers as
> > a system-wide resource, making the other device nodes register-less.
>
> I think option 2 is the standard method if one hardware block provides
> several logical devices. I find it to be a pretty nice solution to this
> problem. We also have precedent in the PWM subsystem. The TWL chips for
> instance use it to create a platform device which is later driven by a
> PWM driver.
One difference though is that the TWL chip is a heterogenous MFD that has
a lot of different sub-devices, where in case of Exynos the timer device
has a set of identical units, each of which can be used either as a PWM or
as a clocksource or other timer.
Arnd
WARNING: multiple messages have this Message-ID (diff)
From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 00/23] RFC: exynos multiplatform support
Date: Thu, 7 Mar 2013 03:02:46 +0000 [thread overview]
Message-ID: <201303070302.46593.arnd@arndb.de> (raw)
In-Reply-To: <20130306123426.GB17079@avionic-0098.mockup.avionic-design.de>
On Wednesday 06 March 2013, Thierry Reding wrote:
> > Option 2 would probably come down to having a trivial MFD driver exposing
> > a regmap. You can probably reuse drivers/mfd/syscon.c for this and make
> > the node compatible with "syscon" to designate the clock registers as
> > a system-wide resource, making the other device nodes register-less.
>
> I think option 2 is the standard method if one hardware block provides
> several logical devices. I find it to be a pretty nice solution to this
> problem. We also have precedent in the PWM subsystem. The TWL chips for
> instance use it to create a platform device which is later driven by a
> PWM driver.
One difference though is that the TWL chip is a heterogenous MFD that has
a lot of different sub-devices, where in case of Exynos the timer device
has a set of identical units, each of which can be used either as a PWM or
as a clocksource or other timer.
Arnd
next prev parent reply other threads:[~2013-03-07 3:02 UTC|newest]
Thread overview: 99+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-05 17:42 [PATCH 00/23] RFC: exynos multiplatform support Arnd Bergmann
2013-03-05 17:42 ` Arnd Bergmann
2013-03-05 17:42 ` [PATCH 01/23] ARM: exynos: introduce EXYNOS_ATAGS symbol Arnd Bergmann
2013-03-05 17:42 ` Arnd Bergmann
2013-03-05 17:42 ` [PATCH 02/23] irqchip: exynos: remove dependency on mach/irqs.h Arnd Bergmann
2013-03-05 17:42 ` Arnd Bergmann
2013-03-05 17:42 ` [PATCH 03/23] tty: serial/samsung: prepare for common clock API Arnd Bergmann
2013-03-05 17:42 ` Arnd Bergmann
2013-03-05 17:42 ` [PATCH 04/23] tty: serial/samsung: make register definitions global Arnd Bergmann
2013-03-05 17:42 ` Arnd Bergmann
2013-03-05 17:42 ` [PATCH 05/23] tty: serial/samsung: fix modular build Arnd Bergmann
2013-03-05 17:42 ` Arnd Bergmann
2013-03-05 17:42 ` [PATCH 06/23] ARM: exynos: move debug-macro.S to include/debug/ Arnd Bergmann
2013-03-05 17:42 ` Arnd Bergmann
2013-03-05 17:42 ` [PATCH 07/23] i2c: s3c2410: make header file local Arnd Bergmann
2013-03-05 17:42 ` Arnd Bergmann
2013-04-02 20:36 ` Heiko Stübner
2013-04-02 20:36 ` Heiko Stübner
2013-03-05 17:42 ` [PATCH 08/23] mmc: sdhci-s3c: remove platform dependencies Arnd Bergmann
2013-03-05 17:42 ` Arnd Bergmann
2013-03-05 17:42 ` [PATCH 09/23] usb: exynos: do not include plat/usb-phy.h Arnd Bergmann
2013-03-05 17:42 ` Arnd Bergmann
2013-03-05 17:42 ` [PATCH 10/23] [media] exynos: remove unnecessary header inclusions Arnd Bergmann
2013-03-05 17:42 ` Arnd Bergmann
2013-04-02 13:08 ` Sylwester Nawrocki
2013-04-02 13:08 ` Sylwester Nawrocki
2013-04-02 13:17 ` Sylwester Nawrocki
2013-03-05 17:42 ` [PATCH 11/23] video/exynos: " Arnd Bergmann
2013-03-05 17:42 ` Arnd Bergmann
2013-03-05 17:42 ` [PATCH 12/23] thermal/exynos: " Arnd Bergmann
2013-03-05 17:42 ` Arnd Bergmann
2013-03-05 17:42 ` [PATCH 13/23] mtd: onenand/samsung: make regs-onenand.h file local Arnd Bergmann
2013-03-05 17:42 ` Arnd Bergmann
2013-03-05 17:42 ` [PATCH 14/23] rtc: s3c: make header " Arnd Bergmann
2013-03-05 17:42 ` Arnd Bergmann
2013-03-05 17:42 ` [PATCH 15/23] spi: s3c64xx: move to generic dmaengine API Arnd Bergmann
2013-03-05 17:42 ` Arnd Bergmann
2013-03-06 9:14 ` Padma Venkat
2013-03-06 9:14 ` Padma Venkat
2013-03-05 17:42 ` [PATCH 16/23] pwm: samsung: repair the worst MMIO abuses Arnd Bergmann
2013-03-05 17:42 ` Arnd Bergmann
2013-03-05 17:42 ` [PATCH 17/23] ASoC: samsung: move plat/ headers to local directory Arnd Bergmann
2013-03-05 17:42 ` Arnd Bergmann
2013-03-05 17:42 ` [PATCH 18/23] ASoC: samsung: convert to dmaengine API Arnd Bergmann
2013-03-05 17:42 ` Arnd Bergmann
2013-03-06 8:58 ` Padma Venkat
2013-03-06 8:58 ` Padma Venkat
2013-03-06 12:01 ` Arnd Bergmann
2013-03-06 12:01 ` Arnd Bergmann
2013-03-05 17:42 ` [PATCH 19/23] ASoC: samsung: use irq resource for idma Arnd Bergmann
2013-03-05 17:42 ` Arnd Bergmann
2013-03-05 17:42 ` [PATCH 20/23] ARM: exynos: prepare for sparse IRQ Arnd Bergmann
2013-03-05 17:42 ` Arnd Bergmann
2013-03-05 17:42 ` [PATCH 21/23] ARM: exynos: hack to disable private clock code Arnd Bergmann
2013-03-05 17:42 ` Arnd Bergmann
2013-03-05 17:42 ` [PATCH 22/23] ARM: exynos: work around missing gpio code on multiplatform Arnd Bergmann
2013-03-05 17:42 ` Arnd Bergmann
2013-03-05 17:42 ` [PATCH 23/23] ARM: exynos: experimental multiplatform support Arnd Bergmann
2013-03-05 17:42 ` Arnd Bergmann
2013-03-05 18:27 ` [PATCH 00/23] RFC: exynos " Tony Lindgren
2013-03-05 18:27 ` Tony Lindgren
2013-03-05 18:28 ` Tomasz Figa
2013-03-05 18:28 ` Tomasz Figa
2013-03-05 19:19 ` Arnd Bergmann
2013-03-05 19:19 ` Arnd Bergmann
2013-03-05 22:48 ` Tomasz Figa
2013-03-05 22:48 ` Tomasz Figa
2013-03-06 10:50 ` Arnd Bergmann
2013-03-06 10:50 ` Arnd Bergmann
2013-03-06 12:34 ` Thierry Reding
2013-03-06 12:34 ` Thierry Reding
2013-03-06 22:57 ` Tomasz Figa
2013-03-06 22:57 ` Tomasz Figa
2013-03-07 3:02 ` Arnd Bergmann [this message]
2013-03-07 3:02 ` Arnd Bergmann
2013-03-07 7:22 ` Thierry Reding
2013-03-07 7:22 ` Thierry Reding
2013-03-08 0:40 ` Tomasz Figa
2013-03-08 0:40 ` Tomasz Figa
2013-03-08 12:52 ` Arnd Bergmann
2013-03-08 12:52 ` Arnd Bergmann
2013-03-06 22:14 ` Heiko Stübner
2013-03-06 22:14 ` Heiko Stübner
2013-03-06 22:55 ` Tomasz Figa
2013-03-06 22:55 ` Tomasz Figa
2013-03-05 20:50 ` Heiko Stübner
2013-03-05 20:50 ` Heiko Stübner
2013-03-05 21:24 ` Arnd Bergmann
2013-03-05 21:24 ` Arnd Bergmann
2013-03-05 21:54 ` Arnd Bergmann
2013-03-05 21:54 ` Arnd Bergmann
2013-03-05 22:12 ` Tomasz Figa
2013-03-05 22:12 ` Tomasz Figa
2013-03-05 22:21 ` Arnd Bergmann
2013-03-05 22:21 ` Arnd Bergmann
2013-03-05 22:25 ` Heiko Stübner
2013-03-05 22:25 ` Heiko Stübner
2013-03-05 22:43 ` Arnd Bergmann
2013-03-05 22:43 ` Arnd Bergmann
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