gitlab.arm.com will be in the maintainance mode on Wednesday June 29th 01:00 - 10:00 (UTC+1). Repositories is read only during the maintainance.

Commit 5775b82e authored by Heiko Stübner's avatar Heiko Stübner Committed by Mike Turquette
Browse files

dt-bindings: add documentation for rk3288 cru



This adds the dt-binding documentation for the clock and reset unit found on
Rockchip rk3288 SoCs.
Signed-off-by: default avatarHeiko Stuebner <heiko@sntech.de>
Acked-By: default avatarMax Schwarz <max.schwarz@online.de>
Tested-By: default avatarMax Schwarz <max.schwarz@online.de>
Signed-off-by: default avatarMike Turquette <mturquette@linaro.org>
parent 2c14736c
* Rockchip RK3288 Clock and Reset Unit
The RK3288 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,rk3288-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 changable, 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/rk3288-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,
- "xin32k" - rtc clock - optional,
- "ext_i2s" - external I2S clock - optional,
- "ext_hsadc" - external HSADC clock - optional,
- "ext_edp_24m" - external display port clock - optional,
- "ext_vip" - external VIP clock - optional,
- "ext_isp" - external ISP clock - optional,
- "ext_jtag" - external JTAG clock - optional
Example: Clock controller node:
cru: cru@20000000 {
compatible = "rockchip,rk3188-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@10124000 {
compatible = "snps,dw-apb-uart";
reg = <0x10124000 0x400>;
interrupts = <GIC_SPI 34 IRQ_TYPE_LEVEL_HIGH>;
reg-shift = <2>;
reg-io-width = <1>;
clocks = <&cru SCLK_UART0>;
};
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment