linux-kernel - Re: [PATCH v5 07/14] ARM: mvebu: Extend the pmsu registers

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Date:	Wed, 26 Mar 2014 13:59:48 +0100
From:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc:	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>, linux-pm@...r.kernel.org,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org,
	Lior Amsalem <alior@...vell.com>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 07/14] ARM: mvebu: Extend the pmsu registers

Dear Sebastian Hesselbarth,

On Wed, 26 Mar 2014 13:04:55 +0100, Sebastian Hesselbarth wrote:
> On 03/25/2014 11:48 PM, Gregory CLEMENT wrote:
> > The initial binding for PMSU were wrong. It didn't take into account
> > all the registers from the PMSU and moreover it referred to registers
> > which are not part of PMSU.
> >
> > The Power Management Unit Service block also controls the Coherency
> > Fabric subsystem. These registers are needed for the CPU idle
> > implementation for the Armada 370/XP, it allows to enter a deep CPU
> > idle state where the Coherency Fabric and the L2 cache are powered
> > down.
> >
> > This commit add support for a new compatible for the PMSU node
> > including the block related to the coherency fabric. It also keeps
> > compatibility with the old binding
> >
> > This patch also adds warnings if one of the base registers set can't
> > be ioremapped.
> >
> > Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
> > ---
> >   arch/arm/mach-mvebu/pmsu.c | 47 +++++++++++++++++++++++++++++++++++++++++-----
> >   1 file changed, 42 insertions(+), 5 deletions(-)
> >
> > diff --git a/arch/arm/mach-mvebu/pmsu.c b/arch/arm/mach-mvebu/pmsu.c
> > index d71ef53107c4..865bcb651e01 100644
> > --- a/arch/arm/mach-mvebu/pmsu.c
> > +++ b/arch/arm/mach-mvebu/pmsu.c
> [...]
> > +static void __init armada_370_xp_pmsu_legacy_init(struct device_node *np)
> > +{
> > +	u32 addr;
> > +	pr_warn("*** Warning ***  Using an old binding which will be deprecated\n");
> > +	/* We just need the adress, we already know the size */
> > +	addr = be32_to_cpu(*of_get_address(np, 0, NULL, NULL));
> > +	addr -= PMSU_BASE_OFFSET;
> > +	pmsu_mp_base = ioremap(addr, PMSU_REG_SIZE);
> > +	of_node_put(np);
> 
> When messing with OF passed resources, I suggest to use
> of_address_to_resource() and work on the struct resource
> instead. The be32_to_cpu pointing to an immediate just looks
> strange.

I'm working on a revised patch set for these PMSU changes, as I also
need them as a preparation for the SMP support on Armada 375/38x. And
my revised patch set makes the manipulations on the 'struct resource',
as you suggest.

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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