mirror of
https://github.com/torvalds/linux.git
synced 2024-12-27 21:33:00 +00:00
3d667920bc
There is only support rmii in the RK3036, so we should use the correct ext clock name as described in the TRM. Signed-off-by: Xing Zheng <zhengxing@rock-chips.com> [update dt-binding document as well] Signed-off-by: Heiko Stuebner <heiko@sntech.de>
57 lines
1.7 KiB
Plaintext
57 lines
1.7 KiB
Plaintext
* Rockchip RK3036 Clock and Reset Unit
|
|
|
|
The RK3036 clock controller generates and supplies clock to various
|
|
controllers within the SoC and also implements a reset controller for SoC
|
|
peripherals.
|
|
|
|
Required Properties:
|
|
|
|
- compatible: should be "rockchip,rk3036-cru"
|
|
- reg: physical base address of the controller and length of memory mapped
|
|
region.
|
|
- #clock-cells: should be 1.
|
|
- #reset-cells: should be 1.
|
|
|
|
Optional Properties:
|
|
|
|
- rockchip,grf: phandle to the syscon managing the "general register files"
|
|
If missing pll rates are not changeable, due to the missing pll lock status.
|
|
|
|
Each clock is assigned an identifier and client nodes can use this identifier
|
|
to specify the clock which they consume. All available clocks are defined as
|
|
preprocessor macros in the dt-bindings/clock/rk3036-cru.h headers and can be
|
|
used in device tree sources. Similar macros exist for the reset sources in
|
|
these files.
|
|
|
|
External clocks:
|
|
|
|
There are several clocks that are generated outside the SoC. It is expected
|
|
that they are defined using standard clock bindings with following
|
|
clock-output-names:
|
|
- "xin24m" - crystal input - required,
|
|
- "ext_i2s" - external I2S clock - optional,
|
|
- "rmii_clkin" - external EMAC clock - optional
|
|
|
|
Example: Clock controller node:
|
|
|
|
cru: cru@20000000 {
|
|
compatible = "rockchip,rk3036-cru";
|
|
reg = <0x20000000 0x1000>;
|
|
rockchip,grf = <&grf>;
|
|
|
|
#clock-cells = <1>;
|
|
#reset-cells = <1>;
|
|
};
|
|
|
|
Example: UART controller node that consumes the clock generated by the clock
|
|
controller:
|
|
|
|
uart0: serial@20060000 {
|
|
compatible = "snps,dw-apb-uart";
|
|
reg = <0x20060000 0x100>;
|
|
interrupts = <GIC_SPI 20 IRQ_TYPE_LEVEL_HIGH>;
|
|
reg-shift = <2>;
|
|
reg-io-width = <4>;
|
|
clocks = <&cru SCLK_UART0>;
|
|
};
|