clk: tegra124: Add support for Tegra124 clocks

Implement clock support for Tegra124.

Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>

1 files changed, 59 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/clock/nvidia,tegra124-car.txt b/Documentation/devicetree/bindings/clock/nvidia,tegra124-car.txt
new file mode 100644
index 000000000000..1a91ec60dee5
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+++ b/Documentation/devicetree/bindings/clock/nvidia,tegra124-car.txt
@@ -0,0 +1,59 @@
+NVIDIA Tegra124 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,tegra124-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 assignments may be found in header file
+  <dt-bindings/clock/tegra124-car.h>.
+
+Example SoC include file:
+
+/ {
+        tegra_car: clock {
+                compatible = "nvidia,tegra124-car";
+                reg = <0x60006000 0x1000>;
+                #clock-cells = <1>;
+        };
+
+        usb@c5004000 {
+                clocks = <&tegra_car TEGRA124_CLK_USB2>;
+        };
+};
+
+Example board file:
+
+/ {
+        clocks {
+                compatible = "simple-bus";
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                osc: clock@0 {
+                        compatible = "fixed-clock";
+                        reg = <0>;
+                        #clock-cells = <0>;
+                        clock-frequency = <112400000>;
+                };
+
+                clk_32k: clock@1 {
+                        compatible = "fixed-clock";
+                        reg = <1>;
+                        #clock-cells = <0>;
+                        clock-frequency = <32768>;
+                };
+        };
+
+        &tegra_car {
+                clocks = <&clk_32k> <&osc>;
+        };
+};