summaryrefslogtreecommitdiffstats
path: root/Documentation/devicetree/bindings/clock/renesas,rcar-gen2-cpg-clocks.txt
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/devicetree/bindings/clock/renesas,rcar-gen2-cpg-clocks.txt')
-rw-r--r--Documentation/devicetree/bindings/clock/renesas,rcar-gen2-cpg-clocks.txt60
1 files changed, 60 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/clock/renesas,rcar-gen2-cpg-clocks.txt b/Documentation/devicetree/bindings/clock/renesas,rcar-gen2-cpg-clocks.txt
new file mode 100644
index 000000000..f8c05bb41
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/renesas,rcar-gen2-cpg-clocks.txt
@@ -0,0 +1,60 @@
+* Renesas R-Car Gen2 Clock Pulse Generator (CPG)
+
+The CPG generates core clocks for the R-Car Gen2 SoCs. It includes three PLLs
+and several fixed ratio dividers.
+The CPG also provides a Clock Domain for SoC devices, in combination with the
+CPG Module Stop (MSTP) Clocks.
+
+Required Properties:
+
+ - compatible: Must be one of
+ - "renesas,r8a7790-cpg-clocks" for the r8a7790 CPG
+ - "renesas,r8a7791-cpg-clocks" for the r8a7791 CPG
+ - "renesas,r8a7792-cpg-clocks" for the r8a7792 CPG
+ - "renesas,r8a7793-cpg-clocks" for the r8a7793 CPG
+ - "renesas,r8a7794-cpg-clocks" for the r8a7794 CPG
+ and "renesas,rcar-gen2-cpg-clocks" as a fallback.
+
+ - reg: Base address and length of the memory resource used by the CPG
+
+ - clocks: References to the parent clocks: first to the EXTAL clock, second
+ to the USB_EXTAL clock
+ - #clock-cells: Must be 1
+ - clock-output-names: The names of the clocks. Supported clocks are "main",
+ "pll0", "pll1", "pll3", "lb", "qspi", "sdh", "sd0", "sd1", "z", "rcan", and
+ "adsp"
+ - #power-domain-cells: Must be 0
+
+SoC devices that are part of the CPG/MSTP Clock Domain and can be power-managed
+through an MSTP clock should refer to the CPG device node in their
+"power-domains" property, as documented by the generic PM domain bindings in
+Documentation/devicetree/bindings/power/power_domain.txt.
+
+
+Examples
+--------
+
+ - CPG device node:
+
+ cpg_clocks: cpg_clocks@e6150000 {
+ compatible = "renesas,r8a7790-cpg-clocks",
+ "renesas,rcar-gen2-cpg-clocks";
+ reg = <0 0xe6150000 0 0x1000>;
+ clocks = <&extal_clk &usb_extal_clk>;
+ #clock-cells = <1>;
+ clock-output-names = "main", "pll0, "pll1", "pll3",
+ "lb", "qspi", "sdh", "sd0", "sd1", "z",
+ "rcan", "adsp";
+ #power-domain-cells = <0>;
+ };
+
+
+ - CPG/MSTP Clock Domain member device node:
+
+ thermal@e61f0000 {
+ compatible = "renesas,thermal-r8a7790", "renesas,rcar-thermal";
+ reg = <0 0xe61f0000 0 0x14>, <0 0xe61f0100 0 0x38>;
+ interrupts = <0 69 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&mstp5_clks R8A7790_CLK_THERMAL>;
+ power-domains = <&cpg_clocks>;
+ };