[PATCH v4 1/7] Documentation: Add device tree bindings for Freescale i.MX GPC

[Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>]

The i.MX6 contains a power controller that controls power gating and
sequencing for the SoC's power domains.

Signed-off-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
---
Changes since v3:
 - Updated documentation to use fsl,power-domain property name
   and pu-power-domain as node name.
 - Removed address-cells/size-cells
---
 .../devicetree/bindings/power/fsl,imx-gpc.txt      | 58 ++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/power/fsl,imx-gpc.txt

diff --git a/Documentation/devicetree/bindings/power/fsl,imx-gpc.txt b/Documentation/devicetree/bindings/power/fsl,imx-gpc.txt
new file mode 100644
index 0000000..05927a7
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/fsl,imx-gpc.txt
@@ -0,0 +1,58 @@
+Freescale i.MX General Power Controller
+=======================================
+
+The i.MX6Q General Power Control (GPC) block contains DVFS load tracking
+counters and Power Gating Control (PGC) for the CPU and PU (GPU/VPU) power
+domains.
+
+Required properties:
+- compatible: Should be "fsl,imx6q-gpc"
+- reg: should be register base and length as documented in the
+  datasheet
+- interrupts: Should contain GPC interrupt request 1
+- pu-supply: Link to the LDO regulator powering the PU power domain
+
+The gpc node should contain a 'pu-power-domain' subnode that serves as a
+phandle target for devices belonging to the PU power domain:
+
+Power domains controlled by a PGC register set
+==============================================
+
+Required properties:
+- compatible: Should be "fsl,imx6q-power-domain"
+- reg: should be register base and length as documented in the
+  datasheet
+
+Specifying power domain for IP modules
+======================================
+
+IP cores belonging to a power domain should contain a 'power-domain' property
+that is a phandle pointing to the power-domain subnode of the gpc device node.
+
+Required properties:
+- fsl,power-domain: A phandle pointing to the power-domain device tree node
+
+
+Example:
+
+	gpc: gpc@020dc000 {
+		compatible = "fsl,imx6q-gpc";
+		reg = <0x020dc000 0x4000>;
+		interrupts = <0 89 0x04 0 90 0x04>;
+		pu-supply = <&reg_pu>;
+
+		pd_pu: pu-power-domain@020dc260 {
+			compatible = "fsl,imx6q-power-domain";
+			reg = <0x020dc260 0x10>;
+		};
+	};
+
+Example of a device that is part of a power domain:
+
+	vpu: vpu@02040000 {
+		reg = <0x02040000 0x3c000>;
+		/* ... */
+		fsl,power-domain = <&pd_pu>;
+		/* ... */
+	};
+
-- 
1.8.5.3

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