From: Rafał Miłecki <rafal@milecki.pl>

This clock is present on BCM53573 devices (including BCM47189) that use
Cortex-A7. ILP is a part of PMU (Power Management Unit) multi-function
device so we use syscon (and regmap) for it.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
---
V2: Rebase on top of clk-next
    Use ALP as parent clock
    Improve comments
    Switch from ioremap_nocache to ioremap
    Check of_clk_add_provide result for error
V3: Drop #include <linux/moduleh>
    Make ILP DT entry part of PMU
    Describe ILP as subdevice of PMU in Documentation
V4: Use BCM53573 name as suggested by Jon and Ray. It seems "Northstar"
    (even if used in some resources) should be used in relation to
    Cortex-A9 devices only.
V5: Rename remaining "ns" references to "bcm53573", sorry, I sent V4 too
    early.
V6: Drop #include <linux/clk.h>
    Use "int" as type where it matches usage
    Add cpu_relax() in the loop
    Add disable callback
    Use _hw_ functions for registering struct clk_hw (new API)

    Thanks a lot Stephen!
V7: Use syscon and regmap (thanks Rob!)
---
 .../bindings/clock/brcm,bcm53573-ilp.txt           |  36 +++++
 drivers/clk/bcm/Makefile                           |   1 +
 drivers/clk/bcm/clk-bcm53573-ilp.c                 | 148 +++++++++++++++++++++
 3 files changed, 185 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/brcm,bcm53573-ilp.txt
 create mode 100644 drivers/clk/bcm/clk-bcm53573-ilp.c

diff --git a/Documentation/devicetree/bindings/clock/brcm,bcm53573-ilp.txt b/Documentation/devicetree/bindings/clock/brcm,bcm53573-ilp.txt
new file mode 100644
index 0000000..4554f70
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/brcm,bcm53573-ilp.txt

@@ -0,0 +1,36 @@
+Broadcom BCM53573 ILP clock
+===========================
+
+This binding uses the common clock binding:
+    Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+This binding is used for ILP clock (sometimes referred as "slow clock")
+on Broadcom BCM53573 devices using Cortex-A7 CPU.
+
+ILP's rate has to be calculated on runtime and it depends on ALP clock
+which has to be referenced.
+
+This clock is part of PMU (Power Management Unit), a Broadcom's device
+handing power-related aspects. Its node must be sub-node of the PMU
+device.
+
+Required properties:
+- compatible: "brcm,bcm53573-ilp"
+- reg: iomem address range of PMU (Power Management Unit)
+- reg-names: "pmu", the only needed & supported reg right now