From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/7] ARM: u300: push down syscon registers
Date: Thu, 2 May 2013 19:39:48 +0200 [thread overview]
Message-ID: <201305021939.48381.arnd@arndb.de> (raw)
In-Reply-To: <CACRpkdayJCm-PcY_=+NDraEPn0m6BrjNRH+tYp3Abar43RamaA@mail.gmail.com>
On Thursday 02 May 2013, Linus Walleij wrote:
> > How do those drivers get to the SYSCON base address? Should they
> > be using drivers/mfd/syscon.c as the multiplexor instead?
>
> No, there is no mutex to be taken. The consecutive range of memory
> addresses are used by different things (mainly the clocks) but there
> is no register that needs to be protected against access from two
> subsystems simultaneously.
>
> As a follow-up to this series I plan to move also the U300 clocks
> to the device tree (similar three-step ladder as used for the Nomadik)
> and then they will (hopefully) get the syscon base address from the
> device tree.
I was less worried about mutexes than a correct representation
in the device tree. With the syscon driver, you can have the
register ranges described exactly once and just use the offsets
on the regmap in the other drivers.
Arnd
next prev parent reply other threads:[~2013-05-02 17:39 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-02 16:16 [PATCH 0/7] ARM: u300 multiplatform support Linus Walleij
2013-05-02 16:16 ` [PATCH 1/7] ARM: u300: push down syscon registers Linus Walleij
2013-05-02 16:21 ` Arnd Bergmann
2013-05-02 16:38 ` Linus Walleij
2013-05-02 17:39 ` Arnd Bergmann [this message]
2013-05-03 8:01 ` Linus Walleij
2013-05-03 8:01 ` Linus Walleij
2013-05-03 14:43 ` Arnd Bergmann
2013-05-03 14:43 ` Arnd Bergmann
2013-05-03 4:04 ` Mike Turquette
2013-05-02 16:16 ` [PATCH 2/7] ARM: u300: remove deps from debug macro Linus Walleij
2013-05-02 16:16 ` [PATCH 3/7] ARM: u300: delete <mach/hardware.h> Linus Walleij
2013-05-02 16:16 ` [PATCH 4/7] ARM: u300: delete <mach/irqs.h> Linus Walleij
2013-05-02 16:16 ` [PATCH 5/7] ARM: u300: localize <mach/u300-regs.h> Linus Walleij
2013-05-02 16:16 ` [PATCH 6/7] ARM: u300: convert to multiplatform Linus Walleij
2013-05-02 16:16 ` [PATCH 7/7] ARM: u300: delete remnant machine headers Linus Walleij
2013-05-02 16:23 ` [PATCH 0/7] ARM: u300 multiplatform support Arnd Bergmann
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