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authorSimon Glass <sjg@chromium.org>2012-02-27 10:52:43 +0000
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2012-03-29 08:12:48 +0200
commit1f1a02123cc1643517498e93497a67dfe8824bd7 (patch)
tree3fba4c0037c0effa54805a9b9129c2a4b4df6653
parent8b7a47d73d26e562918021bf4027adcb660a1146 (diff)
downloadtalos-obmc-uboot-1f1a02123cc1643517498e93497a67dfe8824bd7.tar.gz
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tegra: fdt: Add clock bindings
This adds a basic binding for the oscillator and peripheral clocks. The second cell is the clock number, defined as the bit number within the clock enable register if the peripheral clock. This uses the RFC clock bindings from Grant Likely so may change later: https://lkml.org/lkml/2011/12/12/498 It is taken from Stephen Warren's patch here: http://patchwork.ozlabs.org/patch/141359/ Signed-off-by: Simon Glass <sjg@chromium.org> Signed-off-by: Tom Warren <twarren@nvidia.com>
-rw-r--r--arch/arm/dts/tegra20.dtsi16
-rw-r--r--doc/device-tree-bindings/clock/nvidia,tegra20-car.txt207
2 files changed, 223 insertions, 0 deletions
diff --git a/arch/arm/dts/tegra20.dtsi b/arch/arm/dts/tegra20.dtsi
index a9a98eaf13..2c46e11751 100644
--- a/arch/arm/dts/tegra20.dtsi
+++ b/arch/arm/dts/tegra20.dtsi
@@ -4,6 +4,22 @@
compatible = "nvidia,tegra20";
interrupt-parent = <&intc>;
+ tegra_car: clock@60006000 {
+ compatible = "nvidia,tegra20-car";
+ reg = <0x60006000 0x1000>;
+ #clock-cells = <1>;
+ };
+
+ clocks {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ osc: clock {
+ compatible = "fixed-clock";
+ #clock-cells = <0>;
+ };
+ };
+
intc: interrupt-controller@50041000 {
compatible = "nvidia,tegra20-gic";
interrupt-controller;
diff --git a/doc/device-tree-bindings/clock/nvidia,tegra20-car.txt b/doc/device-tree-bindings/clock/nvidia,tegra20-car.txt
new file mode 100644
index 0000000000..5c07fcaed4
--- /dev/null
+++ b/doc/device-tree-bindings/clock/nvidia,tegra20-car.txt
@@ -0,0 +1,207 @@
+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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