99 lines
2.6 KiB
Plaintext
Executable file
99 lines
2.6 KiB
Plaintext
Executable file
Device tree Clock bindings for Renesas EMMA Mobile EV2
|
|
|
|
This binding uses the common clock binding.
|
|
|
|
* SMU
|
|
System Management Unit described in user's manual R19UH0037EJ1000_SMU.
|
|
This is not a clock provider, but clocks under SMU depend on it.
|
|
|
|
Required properties:
|
|
- compatible: Should be "renesas,emev2-smu"
|
|
- reg: Address and Size of SMU registers
|
|
|
|
* SMU_CLKDIV
|
|
Function block with an input mux and a divider, which corresponds to
|
|
"Serial clock generator" in fig."Clock System Overview" of the manual,
|
|
and "xxx frequency division setting register" (XXXCLKDIV) registers.
|
|
This makes internal (neither input nor output) clock that is provided
|
|
to input of xxxGCLK block.
|
|
|
|
Required properties:
|
|
- compatible: Should be "renesas,emev2-smu-clkdiv"
|
|
- reg: Byte offset from SMU base and Bit position in the register
|
|
- clocks: Parent clocks. Input clocks as described in clock-bindings.txt
|
|
- #clock-cells: Should be <0>
|
|
|
|
* SMU_GCLK
|
|
Clock gating node shown as "Clock stop processing block" in the
|
|
fig."Clock System Overview" of the manual.
|
|
Registers are "xxx clock gate control register" (XXXGCLKCTRL).
|
|
|
|
Required properties:
|
|
- compatible: Should be "renesas,emev2-smu-gclk"
|
|
- reg: Byte offset from SMU base and Bit position in the register
|
|
- clocks: Input clock as described in clock-bindings.txt
|
|
- #clock-cells: Should be <0>
|
|
|
|
Example of provider:
|
|
|
|
usia_u0_sclkdiv: usia_u0_sclkdiv {
|
|
compatible = "renesas,emev2-smu-clkdiv";
|
|
reg = <0x610 0>;
|
|
clocks = <&pll3_fo>, <&pll4_fo>, <&pll1_fo>, <&osc1_fo>;
|
|
#clock-cells = <0>;
|
|
};
|
|
|
|
usia_u0_sclk: usia_u0_sclk {
|
|
compatible = "renesas,emev2-smu-gclk";
|
|
reg = <0x4a0 1>;
|
|
clocks = <&usia_u0_sclkdiv>;
|
|
#clock-cells = <0>;
|
|
};
|
|
|
|
Example of consumer:
|
|
|
|
serial@e1020000 {
|
|
compatible = "renesas,em-uart";
|
|
reg = <0xe1020000 0x38>;
|
|
interrupts = <0 8 0>;
|
|
clocks = <&usia_u0_sclk>;
|
|
clock-names = "sclk";
|
|
};
|
|
|
|
Example of clock-tree description:
|
|
|
|
This describes a clock path in the clock tree
|
|
c32ki -> pll3_fo -> usia_u0_sclkdiv -> usia_u0_sclk
|
|
|
|
smu@e0110000 {
|
|
compatible = "renesas,emev2-smu";
|
|
reg = <0xe0110000 0x10000>;
|
|
#address-cells = <2>;
|
|
#size-cells = <0>;
|
|
|
|
c32ki: c32ki {
|
|
compatible = "fixed-clock";
|
|
clock-frequency = <32768>;
|
|
#clock-cells = <0>;
|
|
};
|
|
pll3_fo: pll3_fo {
|
|
compatible = "fixed-factor-clock";
|
|
clocks = <&c32ki>;
|
|
clock-div = <1>;
|
|
clock-mult = <7000>;
|
|
#clock-cells = <0>;
|
|
};
|
|
usia_u0_sclkdiv: usia_u0_sclkdiv {
|
|
compatible = "renesas,emev2-smu-clkdiv";
|
|
reg = <0x610 0>;
|
|
clocks = <&pll3_fo>;
|
|
#clock-cells = <0>;
|
|
};
|
|
usia_u0_sclk: usia_u0_sclk {
|
|
compatible = "renesas,emev2-smu-gclk";
|
|
reg = <0x4a0 1>;
|
|
clocks = <&usia_u0_sclkdiv>;
|
|
#clock-cells = <0>;
|
|
};
|
|
};
|