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- NVIDIA Tegra20 Clock And Reset Controller
- This binding uses the common clock binding:
- Documentation/devicetree/bindings/clock/clock-bindings.txt
- The CAR (Clock And Reset) Controller on Tegra is the HW module responsible
- for muxing and gating Tegra's clocks, and setting their rates.
- Required properties :
- - compatible : Should be "nvidia,tegra20-car"
- - reg : Should contain CAR registers location and length
- - clocks : Should contain phandle and clock specifiers for two clocks:
- the 32 KHz "32k_in", and the board-specific oscillator "osc".
- - #clock-cells : Should be 1.
- In clock consumers, this cell represents the clock ID exposed by the CAR.
- The first 96 clocks are numbered to match the bits in the CAR's CLK_OUT_ENB
- registers. These IDs often match those in the CAR's RST_DEVICES registers,
- but not in all cases. Some bits in CLK_OUT_ENB affect multiple clocks. In
- this case, those clocks are assigned IDs above 95 in order to highlight
- this issue. Implementations that interpret these clock IDs as bit values
- within the CLK_OUT_ENB or RST_DEVICES registers should be careful to
- explicitly handle these special cases.
- The balance of the clocks controlled by the CAR are assigned IDs of 96 and
- above.
- 0 cpu
- 1 unassigned
- 2 unassigned
- 3 ac97
- 4 rtc
- 5 tmr
- 6 uart1
- 7 unassigned (register bit affects uart2 and vfir)
- 8 gpio
- 9 sdmmc2
- 10 unassigned (register bit affects spdif_in and spdif_out)
- 11 i2s1
- 12 i2c1
- 13 ndflash
- 14 sdmmc1
- 15 sdmmc4
- 16 twc
- 17 pwm
- 18 i2s2
- 19 epp
- 20 unassigned (register bit affects vi and vi_sensor)
- 21 2d
- 22 usbd
- 23 isp
- 24 3d
- 25 ide
- 26 disp2
- 27 disp1
- 28 host1x
- 29 vcp
- 30 unassigned
- 31 cache2
- 32 mem
- 33 ahbdma
- 34 apbdma
- 35 unassigned
- 36 kbc
- 37 stat_mon
- 38 pmc
- 39 fuse
- 40 kfuse
- 41 sbc1
- 42 snor
- 43 spi1
- 44 sbc2
- 45 xio
- 46 sbc3
- 47 dvc
- 48 dsi
- 49 unassigned (register bit affects tvo and cve)
- 50 mipi
- 51 hdmi
- 52 csi
- 53 tvdac
- 54 i2c2
- 55 uart3
- 56 unassigned
- 57 emc
- 58 usb2
- 59 usb3
- 60 mpe
- 61 vde
- 62 bsea
- 63 bsev
- 64 speedo
- 65 uart4
- 66 uart5
- 67 i2c3
- 68 sbc4
- 69 sdmmc3
- 70 pcie
- 71 owr
- 72 afi
- 73 csite
- 74 unassigned
- 75 avpucq
- 76 la
- 77 unassigned
- 78 unassigned
- 79 unassigned
- 80 unassigned
- 81 unassigned
- 82 unassigned
- 83 unassigned
- 84 irama
- 85 iramb
- 86 iramc
- 87 iramd
- 88 cram2
- 89 audio_2x a/k/a audio_2x_sync_clk
- 90 clk_d
- 91 unassigned
- 92 sus
- 93 cdev1
- 94 cdev2
- 95 unassigned
- 96 uart2
- 97 vfir
- 98 spdif_in
- 99 spdif_out
- 100 vi
- 101 vi_sensor
- 102 tvo
- 103 cve
- 104 osc
- 105 clk_32k a/k/a clk_s
- 106 clk_m
- 107 sclk
- 108 cclk
- 109 hclk
- 110 pclk
- 111 blink
- 112 pll_a
- 113 pll_a_out0
- 114 pll_c
- 115 pll_c_out1
- 116 pll_d
- 117 pll_d_out0
- 118 pll_e
- 119 pll_m
- 120 pll_m_out1
- 121 pll_p
- 122 pll_p_out1
- 123 pll_p_out2
- 124 pll_p_out3
- 125 pll_p_out4
- 126 pll_s
- 127 pll_u
- 128 pll_x
- 129 cop a/k/a avp
- 130 audio a/k/a audio_sync_clk
- Example SoC include file:
- / {
- tegra_car: clock@60006000 {
- compatible = "nvidia,tegra20-car";
- reg = <0x60006000 0x1000>;
- #clock-cells = <1>;
- };
- usb@c5004000 {
- clocks = <&tegra_car 58>; /* usb2 */
- };
- };
- Example board file:
- / {
- clocks {
- #address-cells = <1>;
- #size-cells = <0>;
- osc: clock {
- compatible = "fixed-clock";
- #clock-cells = <0>;
- clock-frequency = <12000000>;
- };
- };
- i2c@7000d000 {
- pmic@34 {
- compatible = "ti,tps6586x";
- reg = <0x34>;
- clk_32k: clock {
- compatible = "fixed-clock";
- #clock-cells = <0>;
- clock-frequency = <32768>;
- };
- };
- };
- &tegra_car {
- clocks = <&clk_32k> <&osc>;
- };
- };
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