From mboxrd@z Thu Jan 1 00:00:00 1970 From: Elaine Zhang Subject: [PATCH v3 2/4] dt-bindings: add bindings for rk3328 clock controller Date: Mon, 26 Dec 2016 11:45:28 +0800 Message-ID: <1482723930-5876-3-git-send-email-zhangqing@rock-chips.com> References: <1482723930-5876-1-git-send-email-zhangqing@rock-chips.com> Return-path: In-Reply-To: <1482723930-5876-1-git-send-email-zhangqing@rock-chips.com> Sender: linux-clk-owner@vger.kernel.org To: heiko@sntech.de, mturquette@baylibre.com, sboyd@codeaurora.org, xf@rock-chips.com Cc: robh+dt@kernel.org, mark.rutland@arm.com, linux-clk@vger.kernel.org, huangtao@rock-chips.com, xxx@rock-chips.com, cl@rock-chips.com, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Elaine Zhang List-Id: devicetree@vger.kernel.org Add devicetree bindings for Rockchip cru which found on Rockchip SoCs. Signed-off-by: Elaine Zhang --- .../bindings/clock/rockchip,rk3328-cru.txt | 57 ++++++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 Documentation/devicetree/bindings/clock/rockchip,rk3328-cru.txt diff --git a/Documentation/devicetree/bindings/clock/rockchip,rk3328-cru.txt b/Documentation/devicetree/bindings/clock/rockchip,rk3328-cru.txt new file mode 100644 index 000000000000..20053494d49f --- /dev/null +++ b/Documentation/devicetree/bindings/clock/rockchip,rk3328-cru.txt @@ -0,0 +1,57 @@ +* Rockchip RK3328 Clock and Reset Unit + +The RK3328 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,rk3328-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/rk3328-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, + - "clkin_i2s" - external I2S clock - optional, + - "gmac_clkin" - external GMAC clock - optional + - "phy_50m_out" - output clock of the pll in the mac phy + +Example: Clock controller node: + + cru: clock-controller@ff440000 { + compatible = "rockchip,rk3328-cru", "rockchip,cru", "syscon"; + reg = <0x0 0xff440000 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@ff120000 { + compatible = "snps,dw-apb-uart"; + reg = <0xff120000 0x100>; + interrupts = ; + reg-shift = <2>; + reg-io-width = <4>; + clocks = <&cru SCLK_UART0>; + }; -- 1.9.1