ARM: dt: Add binding for Tegra PMC

The Tegra PMC (Power Management Controller) interfaces with an external
PMU (Power Management Unit), and controls wake-up from sleep modes.

This initial binding is the bare minimum required to control the PMC's
inversion of the PMU's interrupt signal.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

4 files changed, 33 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt
new file mode 100644
index 000000000000..b5846e21cc2e
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt
@@ -0,0 +1,19 @@
+NVIDIA Tegra Power Management Controller (PMC)
+
+Properties:
+- name : Should be pmc
+- compatible : Should contain "nvidia,tegra<chip>-pmc".
+- reg : Offset and length of the register set for the device
+- nvidia,invert-interrupt : If present, inverts the PMU interrupt signal.
+  The PMU is an external Power Management Unit, whose interrupt output
+  signal is fed into the PMC. This signal is optionally inverted, and then
+  fed into the ARM GIC. The PMC is not involved in the detection or
+  handling of this interrupt signal, merely its inversion.
+
+Example:
+
+pmc@7000f400 {
+        compatible = "nvidia,tegra20-pmc";
+        reg = <0x7000e400 0x400>;
+        nvidia,invert-interrupt;
+};
diff --git a/arch/arm/boot/dts/tegra-harmony.dts b/arch/arm/boot/dts/tegra-harmony.dts
index 9a52615c13b8..6e8447dc0202 100644
--- a/arch/arm/boot/dts/tegra-harmony.dts
+++ b/arch/arm/boot/dts/tegra-harmony.dts
@@ -10,6 +10,10 @@
                 reg = < 0x00000000 0x40000000 >;
         };
 
+        pmc@7000f400 {
+                nvidia,invert-interrupt;
+        };
+
         i2c@7000c000 {
                 clock-frequency = <400000>;
 
diff --git a/arch/arm/boot/dts/tegra20.dtsi b/arch/arm/boot/dts/tegra20.dtsi
index 8712449be9e1..3195ad5562d3 100644
--- a/arch/arm/boot/dts/tegra20.dtsi
+++ b/arch/arm/boot/dts/tegra20.dtsi
@@ -4,6 +4,11 @@
         compatible = "nvidia,tegra20";
         interrupt-parent = <&intc>;
 
+        pmc@7000f400 {
+                compatible = "nvidia,tegra20-pmc";
+                reg = <0x7000e400 0x400>;
+        };
+
         intc: interrupt-controller@50041000 {
                 compatible = "arm,cortex-a9-gic";
                 interrupt-controller;
diff --git a/arch/arm/boot/dts/tegra30.dtsi b/arch/arm/boot/dts/tegra30.dtsi
index 8a7e230832d7..fd25e8e9ffd9 100644
--- a/arch/arm/boot/dts/tegra30.dtsi
+++ b/arch/arm/boot/dts/tegra30.dtsi
@@ -4,6 +4,11 @@
         compatible = "nvidia,tegra30";
         interrupt-parent = <&intc>;
 
+        pmc@7000f400 {
+                compatible = "nvidia,tegra20-pmc", "nvidia,tegra30-pmc";
+                reg = <0x7000e400 0x400>;
+        };
+
         intc: interrupt-controller@50041000 {
                 compatible = "arm,cortex-a9-gic";
                 interrupt-controller;