dt-bindings: Add power domain info for NVIDIA PMC

Add power-domain binding documentation for the NVIDIA PMC driver in
order to support generic power-domains.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>

diff --git a/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt
index 53aa549..a74b37b 100644 (file)
--- a/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt
+++ b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt
@@ -1,5 +1,7 @@
 NVIDIA Tegra Power Management Controller (PMC)
 
+== Power Management Controller Node ==
+
 The PMC block interacts with an external Power Management Unit. The PMC
 mostly controls the entry and exit of the system from different sleep
 modes. It provides power-gating controllers for SoC and CPU power-islands.
@@ -70,6 +72,11 @@ Optional properties for hardware-triggered thermal reset (inside 'i2c-thermtrip'
                      Defaults to 0. Valid values are described in section 12.5.2
                      "Pinmux Support" of the Tegra4 Technical Reference Manual.
 
+Optional nodes:
+- powergates : This node contains a hierarchy of power domain nodes, which
+              should match the powergates on the Tegra SoC. See "Powergate
+              Nodes" below.
+
 Example:
 
 / SoC dts including file
@@ -115,3 +122,76 @@ pmc@7000f400 {
        };
        ...
 };
+
+
+== Powergate Nodes ==
+
+Each of the powergate nodes represents a power-domain on the Tegra SoC
+that can be power-gated by the Tegra PMC. The name of the powergate node
+should be one of the below. Note that not every powergate is applicable
+to all Tegra devices and the following list shows which powergates are
+applicable to which devices. Please refer to the Tegra TRM for more
+details on the various powergates.
+
+ Name          Description                     Devices Applicable
+ 3d            3D Graphics                     Tegra20/114/124/210
+ 3d0           3D Graphics 0                   Tegra30
+ 3d1           3D Graphics 1                   Tegra30
+ aud           Audio                           Tegra210
+ dfd           Debug                           Tegra210
+ dis           Display A                       Tegra114/124/210
+ disb          Display B                       Tegra114/124/210
+ heg           2D Graphics                     Tegra30/114/124/210
+ iram          Internal RAM                    Tegra124/210
+ mpe           MPEG Encode                     All
+ nvdec         NVIDIA Video Decode Engine      Tegra210
+ nvjpg         NVIDIA JPEG Engine              Tegra210
+ pcie          PCIE                            Tegra20/30/124/210
+ sata          SATA                            Tegra30/124/210
+ sor           Display interfaces              Tegra124/210
+ ve2           Video Encode Engine 2           Tegra210
+ venc          Video Encode Engine             All
+ vdec          Video Decode Engine             Tegra20/30/114/124
+ vic           Video Imaging Compositor        Tegra124/210
+ xusba         USB Partition A                 Tegra114/124/210
+ xusbb         USB Partition B                 Tegra114/124/210
+ xusbc         USB Partition C                 Tegra114/124/210
+
+Required properties:
+  - clocks: Must contain an entry for each clock required by the PMC for
+    controlling a power-gate. See ../clocks/clock-bindings.txt for details.
+  - resets: Must contain an entry for each reset required by the PMC for
+    controlling a power-gate. See ../reset/reset.txt for details.
+  - #power-domain-cells: Must be 0.
+
+Example:
+
+       pmc: pmc@7000e400 {
+               compatible = "nvidia,tegra210-pmc";
+               reg = <0x0 0x7000e400 0x0 0x400>;
+               clocks = <&tegra_car TEGRA210_CLK_PCLK>, <&clk32k_in>;
+               clock-names = "pclk", "clk32k_in";
+
+               powergates {
+                       pd_audio: aud {
+                               clocks = <&tegra_car TEGRA210_CLK_APE>,
+                                        <&tegra_car TEGRA210_CLK_APB2APE>;
+                               resets = <&tegra_car 198>;
+                               #power-domain-cells = <0>;
+                       };
+               };
+       };
+
+
+== Powergate Clients ==
+
+Hardware blocks belonging to a power domain should contain a "power-domains"
+property that is a phandle pointing to the corresponding powergate node.
+
+Example:
+
+       adma: adma@702e2000 {
+               ...
+               power-domains = <&pd_audio>;
+               ...
+       };