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:

quoted

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 <redacted>
---
  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

[...]

quoted

+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