Documentation: Add device tree bindings for Freescale i.MX GPC

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@pengutronix.de>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

diff --git a/Documentation/devicetree/bindings/power/fsl,imx-gpc.txt b/Documentation/devicetree/bindings/power/fsl,imx-gpc.txt
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+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" or "fsl,imx6sl-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
+- clocks: Clock phandles to devices in the PU power domain that need
+         to be enabled during domain power-up for reset propagation.
+- #power-domain-cells: Should be 1, see below:
+
+The gpc node is a power-controller as documented by the generic power domain
+bindings in Documentation/devicetree/bindings/power/power_domain.txt.
+
+Example:
+
+       gpc: gpc@020dc000 {
+               compatible = "fsl,imx6q-gpc";
+               reg = <0x020dc000 0x4000>;
+               interrupts = <0 89 IRQ_TYPE_LEVEL_HIGH>,
+                            <0 90 IRQ_TYPE_LEVEL_HIGH>;
+               pu-supply = <&reg_pu>;
+               clocks = <&clks IMX6QDL_CLK_GPU3D_CORE>,
+                        <&clks IMX6QDL_CLK_GPU3D_SHADER>,
+                        <&clks IMX6QDL_CLK_GPU2D_CORE>,
+                        <&clks IMX6QDL_CLK_GPU2D_AXI>,
+                        <&clks IMX6QDL_CLK_OPENVG_AXI>,
+                        <&clks IMX6QDL_CLK_VPU_AXI>;
+               #power-domain-cells = <1>;
+       };
+
+
+Specifying power domain for IP modules
+======================================
+
+IP cores belonging to a power domain should contain a 'power-domains' property
+that is a phandle pointing to the gpc device node and a DOMAIN_INDEX specifying
+the power domain the device belongs to.
+
+Example of a device that is part of the PU power domain:
+
+       vpu: vpu@02040000 {
+               reg = <0x02040000 0x3c000>;
+               /* ... */
+               power-domains = <&gpc 1>;
+               /* ... */
+       };
+
+The following DOMAIN_INDEX values are valid for i.MX6Q:
+ARM_DOMAIN     0
+PU_DOMAIN      1
+The following additional DOMAIN_INDEX value is valid for i.MX6SL:
+DISPLAY_DOMAIN 2