of: Add binding for NVIDIA Tegra ACTMON node

This block gathers statistics about various counters and can be configured to
fire interrupts when thresholds are crossed.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
[treding@nvidia.com: rename document, minor cleanups]
Signed-off-by: Thierry Reding <treding@nvidia.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra30-actmon.txt b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra30-actmon.txt
new file mode 100644
index 000000000000..ea670a5d7ee3
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra30-actmon.txt
@@ -0,0 +1,32 @@
+NVIDIA Tegra Activity Monitor
+
+The activity monitor block collects statistics about the behaviour of other
+components in the system. This information can be used to derive the rate at
+which the external memory needs to be clocked in order to serve all requests
+from the monitored clients.
+
+Required properties:
+- compatible: should be "nvidia,tegra<chip>-actmon"
+- reg: offset and length of the register set for the device
+- interrupts: standard interrupt property
+- clocks: Must contain a phandle and clock specifier pair for each entry in
+clock-names. See ../../clock/clock-bindings.txt for details.
+- clock-names: Must include the following entries:
+  - actmon
+  - emc
+- resets: Must contain an entry for each entry in reset-names. See
+../../reset/reset.txt for details.
+- reset-names: Must include the following entries:
+  - actmon
+
+Example:
+        actmon@6000c800 {
+                compatible = "nvidia,tegra124-actmon";
+                reg = <0x0 0x6000c800 0x0 0x400>;
+                interrupts = <GIC_SPI 45 IRQ_TYPE_LEVEL_HIGH>;
+                clocks = <&tegra_car TEGRA124_CLK_ACTMON>,
+                         <&tegra_car TEGRA124_CLK_EMC>;
+                clock-names = "actmon", "emc";
+                resets = <&tegra_car 119>;
+                reset-names = "actmon";
+        };