From mboxrd@z Thu Jan 1 00:00:00 1970 From: sebastian.hesselbarth@gmail.com (Sebastian Hesselbarth) Date: Wed, 26 Mar 2014 13:04:55 +0100 Subject: [PATCH v5 07/14] ARM: mvebu: Extend the pmsu registers In-Reply-To: <1395787705-31061-8-git-send-email-gregory.clement@free-electrons.com> References: <1395787705-31061-1-git-send-email-gregory.clement@free-electrons.com> <1395787705-31061-8-git-send-email-gregory.clement@free-electrons.com> Message-ID: <5332C267.3080908@gmail.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 > --- > 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. Sebastian