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YAML conversion of the rk3328 clock controller binding.
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* Rockchip RK3328 Clock and Reset Unit
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The RK3328 clock controller generates and supplies clock to various
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controllers within the SoC and also implements a reset controller for SoC
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peripherals.
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Required Properties:
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- compatible: should be "rockchip,rk3328-cru"
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- reg: physical base address of the controller and length of memory mapped
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region.
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- #clock-cells: should be 1.
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- #reset-cells: should be 1.
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Optional Properties:
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- rockchip,grf: phandle to the syscon managing the "general register files"
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If missing pll rates are not changeable, due to the missing pll lock status.
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Each clock is assigned an identifier and client nodes can use this identifier
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to specify the clock which they consume. All available clocks are defined as
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preprocessor macros in the dt-bindings/clock/rk3328-cru.h headers and can be
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used in device tree sources. Similar macros exist for the reset sources in
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these files.
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External clocks:
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There are several clocks that are generated outside the SoC. It is expected
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that they are defined using standard clock bindings with following
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clock-output-names:
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- "xin24m" - crystal input - required,
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- "clkin_i2s" - external I2S clock - optional,
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- "gmac_clkin" - external GMAC clock - optional
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- "phy_50m_out" - output clock of the pll in the mac phy
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- "hdmi_phy" - output clock of the hdmi phy pll - optional
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Example: Clock controller node:
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cru: clock-controller@ff440000 {
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compatible = "rockchip,rk3328-cru";
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reg = <0x0 0xff440000 0x0 0x1000>;
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rockchip,grf = <&grf>;
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#clock-cells = <1>;
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#reset-cells = <1>;
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};
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Example: UART controller node that consumes the clock generated by the clock
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controller:
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uart0: serial@ff120000 {
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compatible = "snps,dw-apb-uart";
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reg = <0xff120000 0x100>;
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interrupts = <GIC_SPI 56 IRQ_TYPE_LEVEL_HIGH>;
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reg-shift = <2>;
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reg-io-width = <4>;
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clocks = <&cru SCLK_UART0>;
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};
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@ -0,0 +1,74 @@
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# SPDX-License-Identifier: GPL-2.0
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/clock/rockchip,rk3328-cru.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Rockchip RK3328 Clock and Reset Unit (CRU)
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maintainers:
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- Elaine Zhang <zhangqing@rock-chips.com>
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- Heiko Stuebner <heiko@sntech.de>
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description: |
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The RK3328 clock controller generates and supplies clocks to various
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controllers within the SoC and also implements a reset controller for SoC
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peripherals.
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Each clock is assigned an identifier and client nodes can use this identifier
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to specify the clock which they consume. All available clocks are defined as
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preprocessor macros in the dt-bindings/clock/rk3328-cru.h headers and can be
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used in device tree sources. Similar macros exist for the reset sources in
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these files.
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There are several clocks that are generated outside the SoC. It is expected
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that they are defined using standard clock bindings with following
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clock-output-names:
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- "xin24m" - crystal input - required,
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- "clkin_i2s" - external I2S clock - optional,
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- "gmac_clkin" - external GMAC clock - optional
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- "phy_50m_out" - output clock of the pll in the mac phy
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- "hdmi_phy" - output clock of the hdmi phy pll - optional
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properties:
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compatible:
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enum:
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- rockchip,rk3328-cru
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reg:
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maxItems: 1
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"#clock-cells":
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const: 1
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"#reset-cells":
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const: 1
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clocks:
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maxItems: 1
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clock-names:
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const: xin24m
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rockchip,grf:
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$ref: /schemas/types.yaml#/definitions/phandle
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description:
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Phandle to the syscon managing the "general register files" (GRF),
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if missing pll rates are not changeable, due to the missing pll
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lock status.
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required:
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- compatible
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- reg
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- "#clock-cells"
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- "#reset-cells"
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additionalProperties: false
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examples:
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- |
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cru: clock-controller@ff440000 {
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compatible = "rockchip,rk3328-cru";
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reg = <0xff440000 0x1000>;
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rockchip,grf = <&grf>;
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#clock-cells = <1>;
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#reset-cells = <1>;
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};
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