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  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]
Date:	Mon, 01 Sep 2014 12:37:10 +0200
From:	Arnd Bergmann <>
To:	Lee Jones <>
Cc:	Pankaj Dubey <>,,,,,,,,,,,
	Tomasz Figa <>,
Subject: Re: [PATCH] mfd: syscon: Decouple syscon interface from syscon devices

On Monday 01 September 2014 08:49:18 Lee Jones wrote:
> On Fri, 22 Aug 2014, Pankaj Dubey wrote:
> > From: Tomasz Figa <>
> > 
> > Currently a syscon entity can be only registered directly through a
> > platform device that binds to a dedicated driver. However in certain use
> > cases it is desirable to make a device used with another driver a syscon
> > interface provider. For example, certain SoCs (e.g. Exynos) contain
> > system controller blocks which perform various functions such as power
> > domain control, CPU power management, low power mode control, but in
> > addition contain certain IP integration glue, such as various signal
> > masks, coprocessor power control, etc. In such case, there is a need to
> > have a dedicated driver for such system controller but also share
> > registers with other drivers. The latter is where the syscon interface
> > is helpful.
> > 
> > This patch decouples syscon object from syscon driver, so that it can be
> > registered from any driver in addition to the original "syscon" platform
> > driver.
> > 
> > Signed-off-by: Tomasz Figa <>
> > Signed-off-by: Pankaj Dubey <>
> > ---
> > 
> > RFC patch [1] was posted by Tomasz Figa. This patch addresses some of
> > comments given by Arnd to RFC patch, and further decouples syscon from
> > device model. It also gives flexibility of registering with syscon at
> > early stage using device_node object.
> It would be helpful if Arnd gave this revision his blessing (Ack).

I never saw a reason why we don't take this all the way as discussed
a few times: Completely remove the dependency of syscon on having
a platform driver for it, and make it possible to just call
syscon_regmap_lookup_by_phandle() without having to register
it first.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

Powered by blists - more mailing lists