From: Xiao Feng Date: Mon, 25 Jan 2016 04:33:11 +0000 (+0800) Subject: dt-bindings: add documentation of rk3366 clock controller X-Git-Tag: firefly_0821_release~3461 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e75eb8ab797793792773fa316816d25d3d234235;p=firefly-linux-kernel-4.4.55.git dt-bindings: add documentation of rk3366 clock controller Add the devicetree binding for the cru on the rk3366 which quite similar structured as previous clock controllers. Change-Id: I109da26f88cd733b64d4c4339db63346dd9ffea6 Signed-off-by: Xiao Feng --- diff --git a/Documentation/devicetree/bindings/clock/rockchip,rk3366-cru.txt b/Documentation/devicetree/bindings/clock/rockchip,rk3366-cru.txt new file mode 100644 index 000000000000..d9d776611d5f --- /dev/null +++ b/Documentation/devicetree/bindings/clock/rockchip,rk3366-cru.txt @@ -0,0 +1,58 @@ +* Rockchip RK3366 Clock and Reset Unit + +The RK3366 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,rk3366-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/rk3366-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_gmac" - external GMAC clock - optional + - "ext_jtag" - external JTAG clock - optional + - "usbotg_out" - output clock of the pll in the otg phy + +Example: Clock controller node: + + cru: clock-controller@ff760000 { + compatible = "rockchip,rk3366-cru"; + reg = <0x0 0xff760000 0x0 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 = ; + reg-shift = <2>; + reg-io-width = <1>; + clocks = <&cru SCLK_UART0>; + };