From mboxrd@z Thu Jan 1 00:00:00 1970 From: gregory.clement@free-electrons.com (Gregory CLEMENT) Date: Wed, 26 Mar 2014 13:01:44 +0100 Subject: [PATCH v5 07/14] ARM: mvebu: Extend the pmsu registers In-Reply-To: <5332C267.3080908@gmail.com> References: <1395787705-31061-1-git-send-email-gregory.clement@free-electrons.com> <1395787705-31061-8-git-send-email-gregory.clement@free-electrons.com> <5332C267.3080908@gmail.com> Message-ID: <5332C1A8.8040307@free-electrons.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 26/03/2014 13:04, 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 >> --- >> 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. Actually it was taken from of_address_to_resource()! As I didn't need the size I have just took the usefull part for my need. > > Sebastian > -- Gregory Clement, Free Electrons Kernel, drivers, real-time and embedded Linux development, consulting, training and support. http://free-electrons.com