From 485a40d7cd4aab5ae939320278809776388f5c06 Mon Sep 17 00:00:00 2001 From: Xing Zheng Date: Mon, 28 Mar 2016 17:51:35 +0800 Subject: dt-bindings: add bindings for rk3399 clock controller Add devicetree bindings for Rockchip cru which found on Rockchip SoCs. Signed-off-by: Xing Zheng Signed-off-by: Jianqun Xu Acked-by: Rob Herring Signed-off-by: Heiko Stuebner --- .../bindings/clock/rockchip,rk3399-cru.txt | 62 ++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 Documentation/devicetree/bindings/clock/rockchip,rk3399-cru.txt (limited to 'Documentation') diff --git a/Documentation/devicetree/bindings/clock/rockchip,rk3399-cru.txt b/Documentation/devicetree/bindings/clock/rockchip,rk3399-cru.txt new file mode 100644 index 000000000000..3888dd33fcbd --- /dev/null +++ b/Documentation/devicetree/bindings/clock/rockchip,rk3399-cru.txt @@ -0,0 +1,62 @@ +* Rockchip RK3399 Clock and Reset Unit + +The RK3399 clock controller generates and supplies clock to various +controllers within the SoC and also implements a reset controller for SoC +peripherals. + +Required Properties: + +- compatible: PMU for CRU should be "rockchip,rk3399-pmucru" +- compatible: CRU should be "rockchip,rk3399-cru" +- reg: physical base address of the controller and length of memory mapped + region. +- #clock-cells: should be 1. +- #reset-cells: should be 1. + +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/rk3399-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, + - "clkin_gmac" - external GMAC clock - optional, + - "clkin_i2s" - external I2S clock - optional, + - "pclkin_cif" - external ISP clock - optional, + - "clk_usbphy0_480m" - output clock of the pll in the usbphy0 + - "clk_usbphy1_480m" - output clock of the pll in the usbphy1 + +Example: Clock controller node: + + pmucru: pmu-clock-controller@ff750000 { + compatible = "rockchip,rk3399-pmucru"; + reg = <0x0 0xff750000 0x0 0x1000>; + #clock-cells = <1>; + #reset-cells = <1>; + }; + + cru: clock-controller@ff760000 { + compatible = "rockchip,rk3399-cru"; + reg = <0x0 0xff760000 0x0 0x1000>; + #clock-cells = <1>; + #reset-cells = <1>; + }; + +Example: UART controller node that consumes the clock generated by the clock + controller: + + uart0: serial@ff1a0000 { + compatible = "rockchip,rk3399-uart", "snps,dw-apb-uart"; + reg = <0x0 0xff180000 0x0 0x100>; + clocks = <&cru SCLK_UART0>, <&cru PCLK_UART0>; + clock-names = "baudclk", "apb_pclk"; + interrupts = ; + reg-shift = <2>; + reg-io-width = <4>; + }; -- cgit v1.2.3