1 NVIDIA Tegra Power Management Controller (PMC)
3 The PMC block interacts with an external Power Management Unit. The PMC
4 mostly controls the entry and exit of the system from different sleep
5 modes. It provides power-gating controllers for SoC and CPU power-islands.
9 - compatible : Should contain "nvidia,tegra<chip>-pmc".
10 - reg : Offset and length of the register set for the device
11 - clocks : Must contain an entry for each entry in clock-names.
12 See ../clocks/clock-bindings.txt for details.
13 - clock-names : Must include the following entries:
14 "pclk" (The Tegra clock of that name),
15 "clk32k_in" (The 32KHz clock input to Tegra).
18 - nvidia,invert-interrupt : If present, inverts the PMU interrupt signal.
19 The PMU is an external Power Management Unit, whose interrupt output
20 signal is fed into the PMC. This signal is optionally inverted, and then
21 fed into the ARM GIC. The PMC is not involved in the detection or
22 handling of this interrupt signal, merely its inversion.
23 - nvidia,suspend-mode : The suspend mode that the platform should use.
24 Valid values are 0, 1 and 2:
25 0 (LP0): CPU + Core voltage off and DRAM in self-refresh
26 1 (LP1): CPU voltage off and DRAM in self-refresh
27 2 (LP2): CPU voltage off
28 - nvidia,core-power-req-active-high : Boolean, core power request active-high
29 - nvidia,sys-clock-req-active-high : Boolean, system clock request active-high
30 - nvidia,combined-power-req : Boolean, combined power request for CPU & Core
31 - nvidia,cpu-pwr-good-en : Boolean, CPU power good signal (from PMIC to PMC)
34 Required properties when nvidia,suspend-mode is specified:
35 - nvidia,cpu-pwr-good-time : CPU power good time in uS.
36 - nvidia,cpu-pwr-off-time : CPU power off time in uS.
37 - nvidia,core-pwr-good-time : <Oscillator-stable-time Power-stable-time>
38 Core power good time in uS.
39 - nvidia,core-pwr-off-time : Core power off time in uS.
41 Required properties when nvidia,suspend-mode=<0>:
42 - nvidia,lp0-vec : <start length> Starting address and length of LP0 vector
43 The LP0 vector contains the warm boot code that is executed by AVP when
44 resuming from the LP0 state. The AVP (Audio-Video Processor) is an ARM7
45 processor and always being the first boot processor when chip is power on
46 or resume from deep sleep mode. When the system is resumed from the deep
47 sleep mode, the warm boot code will restore some PLLs, clocks and then
48 bring up CPU0 for resuming the system.
52 / SoC dts including file
54 compatible = "nvidia,tegra20-pmc";
55 reg = <0x7000e400 0x400>;
56 clocks = <&tegra_car 110>, <&clk32k_in>;
57 clock-names = "pclk", "clk32k_in";
58 nvidia,invert-interrupt;
59 nvidia,suspend-mode = <1>;
60 nvidia,cpu-pwr-good-time = <2000>;
61 nvidia,cpu-pwr-off-time = <100>;
62 nvidia,core-pwr-good-time = <3845 3845>;
63 nvidia,core-pwr-off-time = <458>;
64 nvidia,core-power-req-active-high;
65 nvidia,sys-clock-req-active-high;
66 nvidia,lp0-vec = <0xbdffd000 0x2000>;
69 / Tegra board dts file
73 compatible = "simple-bus";
78 compatible = "fixed-clock";
81 clock-frequency = <32768>;