ARM: mvebu: add CA9 MPcore SoC Controller node

The CA9 MPcore SoC Control block is a set of registers that allows to
configure certain internal aspects of the core blocks of the SoC
(Cortex-A9, L2 cache controller, etc.). In most cases, the default
values are fine so they aren't many reasons to touch those registers,
but there is one exception: to support cpuidle on Armada 38x, we need
to modify the value of the CA9 MPcore Reset Control register.

Therefore, this commit adds a new Device Tree binding for this
hardware block, and uses this new binding for the Armada 38x Device
Tree file.

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: devicetree@vger.kernel.org
Link: https://lkml.kernel.org/r/1404913221-17343-11-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

diff --git a/Documentation/devicetree/bindings/arm/armada-380-mpcore-soc-ctrl.txt b/Documentation/devicetree/bindings/arm/armada-380-mpcore-soc-ctrl.txt
new file mode 100644 (file)
index 0000000..8781073
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/armada-380-mpcore-soc-ctrl.txt
@@ -0,0 +1,14 @@
+Marvell Armada 38x CA9 MPcore SoC Controller
+============================================
+
+Required properties:
+
+- compatible: Should be "marvell,armada-380-mpcore-soc-ctrl".
+
+- reg: should be the register base and length as documented in the
+  datasheet for the CA9 MPcore SoC Control registers
+
+mpcore-soc-ctrl@20d20 {
+       compatible = "marvell,armada-380-mpcore-soc-ctrl";
+       reg = <0x20d20 0x6c>;
+};

diff --git a/arch/arm/boot/dts/armada-38x.dtsi b/arch/arm/boot/dts/armada-38x.dtsi
index 3de364e..b479eaa 100644 (file)
--- a/arch/arm/boot/dts/armada-38x.dtsi
+++ b/arch/arm/boot/dts/armada-38x.dtsi
@@ -286,6 +286,11 @@
                                reg = <0x20800 0x10>;
                        };
 
+                       mpcore-soc-ctrl@20d20 {
+                               compatible = "marvell,armada-380-mpcore-soc-ctrl";
+                               reg = <0x20d20 0x6c>;
+                       };
+
                        coherency-fabric@21010 {
                                compatible = "marvell,armada-380-coherency-fabric";
                                reg = <0x21010 0x1c>;