FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/arm/tegra/nvidia,tegra186-pmc.txt

     NVIDIA Tegra Power Management Controller (PMC)
     
     Required properties:
     - compatible: Should contain one of the following:
       - "nvidia,tegra186-pmc": for Tegra186
       - "nvidia,tegra194-pmc": for Tegra194
       - "nvidia,tegra234-pmc": for Tegra234
     - reg: Must contain an (offset, length) pair of the register set for each
       entry in reg-names.
    - reg-names: Must include the following entries:
      - "pmc"
      - "wake"
      - "aotag"
      - "scratch"
      - "misc" (Only for Tegra194 and later)
    
    Optional properties:
    - nvidia,invert-interrupt: If present, inverts the PMU interrupt signal.
    - interrupt-controller: Identifies the node as an interrupt controller.
    - #interrupt-cells: Specifies the number of cells needed to encode an
      interrupt source. The value must be 2.
    
    Example:
    
    SoC DTSI:
    
            pmc@c3600000 {
                    compatible = "nvidia,tegra186-pmc";
                    reg = <0 0x0c360000 0 0x10000>,
                          <0 0x0c370000 0 0x10000>,
                          <0 0x0c380000 0 0x10000>,
                          <0 0x0c390000 0 0x10000>;
                    reg-names = "pmc", "wake", "aotag", "scratch";
            };
    
    Board DTS:
    
            pmc@c360000 {
                    nvidia,invert-interrupt;
            };
    
    == Pad Control ==
    
    On Tegra SoCs a pad is a set of pins which are configured as a group.
    The pin grouping is a fixed attribute of the hardware. The PMC can be
    used to set pad power state and signaling voltage. A pad can be either
    in active or power down mode. The support for power state and signaling
    voltage configuration varies depending on the pad in question. 3.3 V and
    1.8 V signaling voltages are supported on pins where software
    controllable signaling voltage switching is available.
    
    Pad configurations are described with pin configuration nodes which
    are placed under the pmc node and they are referred to by the pinctrl
    client properties. For more information see
    Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt.
    
    The following pads are present on Tegra186:
    csia            csib            dsi             mipi-bias
    pex-clk-bias    pex-clk3        pex-clk2        pex-clk1
    usb0            usb1            usb2            usb-bias
    uart            audio           hsic            dbg
    hdmi-dp0        hdmi-dp1        pex-cntrl       sdmmc2-hv
    sdmmc4          cam             dsib            dsic
    dsid            csic            csid            csie
    dsif            spi             ufs             dmic-hv
    edp             sdmmc1-hv       sdmmc3-hv       conn
    audio-hv        ao-hv
    
    Required pin configuration properties:
      - pins: A list of strings, each of which contains the name of a pad
              to be configured.
    
    Optional pin configuration properties:
      - low-power-enable: Configure the pad into power down mode
      - low-power-disable: Configure the pad into active mode
      - power-source: Must contain either TEGRA_IO_PAD_VOLTAGE_1V8 or
        TEGRA_IO_PAD_VOLTAGE_3V3 to select between signaling voltages.
        The values are defined in
        include/dt-bindings/pinctrl/pinctrl-tegra-io-pad.h.
    
    Note: The power state can be configured on all of the above pads except
          for ao-hv. Following pads have software configurable signaling
          voltages: sdmmc2-hv, dmic-hv, sdmmc1-hv, sdmmc3-hv, audio-hv,
          ao-hv.
    
    Pad configuration state example:
            pmc: pmc@7000e400 {
                    compatible = "nvidia,tegra186-pmc";
                    reg = <0 0x0c360000 0 0x10000>,
                          <0 0x0c370000 0 0x10000>,
                          <0 0x0c380000 0 0x10000>,
                          <0 0x0c390000 0 0x10000>;
                    reg-names = "pmc", "wake", "aotag", "scratch";
    
                    ...
    
                    sdmmc1_3v3: sdmmc1-3v3 {
                            pins = "sdmmc1-hv";
                            power-source = <TEGRA_IO_PAD_VOLTAGE_3V3>;
                   };
   
                   sdmmc1_1v8: sdmmc1-1v8 {
                           pins = "sdmmc1-hv";
                           power-source = <TEGRA_IO_PAD_VOLTAGE_1V8>;
                   };
   
                   hdmi_off: hdmi-off {
                           pins = "hdmi";
                           low-power-enable;
                   }
   
                   hdmi_on: hdmi-on {
                           pins = "hdmi";
                           low-power-disable;
                   }
           };
   
   Pinctrl client example:
           sdmmc1: sdhci@3400000 {
                   ...
                   pinctrl-names = "sdmmc-3v3", "sdmmc-1v8";
                   pinctrl-0 = <&sdmmc1_3v3>;
                   pinctrl-1 = <&sdmmc1_1v8>;
           };
   
           ...
   
           sor0: sor@15540000 {
                   ...
                   pinctrl-0 = <&hdmi_off>;
                   pinctrl-1 = <&hdmi_on>;
                   pinctrl-names = "hdmi-on", "hdmi-off";
           };

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