mirror of https://gitee.com/openkylin/linux.git
53 lines
1.5 KiB
Plaintext
53 lines
1.5 KiB
Plaintext
* Hisilicon Hi6220 Clock Controller
|
|
|
|
Clock control registers reside in different Hi6220 system controllers,
|
|
please refer the following document to know more about the binding rules
|
|
for these system controllers:
|
|
|
|
Documentation/devicetree/bindings/arm/hisilicon/hisilicon.txt
|
|
|
|
Required Properties:
|
|
|
|
- compatible: the compatible should be one of the following strings to
|
|
indicate the clock controller functionality.
|
|
|
|
- "hisilicon,hi6220-acpu-sctrl"
|
|
- "hisilicon,hi6220-aoctrl"
|
|
- "hisilicon,hi6220-sysctrl"
|
|
- "hisilicon,hi6220-mediactrl"
|
|
- "hisilicon,hi6220-pmctrl"
|
|
- "hisilicon,hi6220-stub-clk"
|
|
|
|
- reg: physical base address of the controller and length of memory mapped
|
|
region.
|
|
|
|
- #clock-cells: should be 1.
|
|
|
|
Optional Properties:
|
|
|
|
- hisilicon,hi6220-clk-sram: phandle to the syscon managing the SoC internal sram;
|
|
the driver need use the sram to pass parameters for frequency change.
|
|
|
|
- mboxes: use the label reference for the mailbox as the first parameter, the
|
|
second parameter is the channel number.
|
|
|
|
Example 1:
|
|
sys_ctrl: sys_ctrl@f7030000 {
|
|
compatible = "hisilicon,hi6220-sysctrl", "syscon";
|
|
reg = <0x0 0xf7030000 0x0 0x2000>;
|
|
#clock-cells = <1>;
|
|
};
|
|
|
|
Example 2:
|
|
stub_clock: stub_clock {
|
|
compatible = "hisilicon,hi6220-stub-clk";
|
|
hisilicon,hi6220-clk-sram = <&sram>;
|
|
#clock-cells = <1>;
|
|
mboxes = <&mailbox 1>;
|
|
};
|
|
|
|
Each clock is assigned an identifier and client nodes use this identifier
|
|
to specify the clock which they consume.
|
|
|
|
All these identifier could be found in <dt-bindings/clock/hi6220-clock.h>.
|