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