Documentation/devicetree/bindings/power/fsl,imx-gpc.txt

   1 Freescale i.MX General Power Controller
   2 =======================================
   3
   4 The i.MX6Q General Power Control (GPC) block contains DVFS load tracking
   5 counters and Power Gating Control (PGC) for the CPU and PU (GPU/VPU) power
   6 domains.
   7
   8 Required properties:
   9 - compatible: Should be "fsl,imx6q-gpc" or "fsl,imx6sl-gpc"
  10 - reg: should be register base and length as documented in the
  11   datasheet
  12 - interrupts: Should contain GPC interrupt request 1
  13 - pu-supply: Link to the LDO regulator powering the PU power domain
  14 - clocks: Clock phandles to devices in the PU power domain that need
  15           to be enabled during domain power-up for reset propagation.
  16 - #power-domain-cells: Should be 1, see below:
  17
  18 The gpc node is a power-controller as documented by the generic power domain
  19 bindings in Documentation/devicetree/bindings/power/power_domain.txt.
  20
  21 Example:
  22
  23         gpc: gpc@020dc000 {
  24                 compatible = "fsl,imx6q-gpc";
  25                 reg = <0x020dc000 0x4000>;
  26                 interrupts = <0 89 IRQ_TYPE_LEVEL_HIGH>,
  27                              <0 90 IRQ_TYPE_LEVEL_HIGH>;
  28                 pu-supply = <&reg_pu>;
  29                 clocks = <&clks IMX6QDL_CLK_GPU3D_CORE>,
  30                          <&clks IMX6QDL_CLK_GPU3D_SHADER>,
  31                          <&clks IMX6QDL_CLK_GPU2D_CORE>,
  32                          <&clks IMX6QDL_CLK_GPU2D_AXI>,
  33                          <&clks IMX6QDL_CLK_OPENVG_AXI>,
  34                          <&clks IMX6QDL_CLK_VPU_AXI>;
  35                 #power-domain-cells = <1>;
  36         };
  37
  38
  39 Specifying power domain for IP modules
  40 ======================================
  41
  42 IP cores belonging to a power domain should contain a 'power-domains' property
  43 that is a phandle pointing to the gpc device node and a DOMAIN_INDEX specifying
  44 the power domain the device belongs to.
  45
  46 Example of a device that is part of the PU power domain:
  47
  48         vpu: vpu@02040000 {
  49                 reg = <0x02040000 0x3c000>;
  50                 /* ... */
  51                 power-domains = <&gpc 1>;
  52                 /* ... */
  53         };
  54
  55 The following DOMAIN_INDEX values are valid for i.MX6Q:
  56 ARM_DOMAIN     0
  57 PU_DOMAIN      1
  58 The following additional DOMAIN_INDEX value is valid for i.MX6SL:
  59 DISPLAY_DOMAIN 2