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Diffstat (limited to 'Documentation/devicetree/bindings/clock/st,stm32-rcc.yaml')
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diff --git a/Documentation/devicetree/bindings/clock/st,stm32-rcc.yaml b/Documentation/devicetree/bindings/clock/st,stm32-rcc.yaml new file mode 100644 index 000000000000..f83a6120d65a --- /dev/null +++ b/Documentation/devicetree/bindings/clock/st,stm32-rcc.yaml @@ -0,0 +1,144 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/clock/st,stm32-rcc.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: STMicroelectronics STM32 Reset Clock Controller + +maintainers: + - Dario Binacchi <dario.binacchi@amarulasolutions.com> + +description: | + The RCC IP is both a reset and a clock controller. + The reset phandle argument is the bit number within the RCC registers bank, + starting from RCC base address. + +properties: + compatible: + oneOf: + - items: + - enum: + - st,stm32f42xx-rcc + - st,stm32f746-rcc + - st,stm32h743-rcc + - const: st,stm32-rcc + - items: + - enum: + - st,stm32f469-rcc + - const: st,stm32f42xx-rcc + - const: st,stm32-rcc + - items: + - enum: + - st,stm32f769-rcc + - const: st,stm32f746-rcc + - const: st,stm32-rcc + + reg: + maxItems: 1 + + '#reset-cells': + const: 1 + + '#clock-cells': + enum: [1, 2] + + clocks: + minItems: 2 + maxItems: 3 + + st,syscfg: + $ref: /schemas/types.yaml#/definitions/phandle + description: + Phandle to system configuration controller. It can be used to control the + power domain circuitry. + + st,ssc-modfreq-hz: + description: + The modulation frequency for main PLL (in Hz) + + st,ssc-moddepth-permyriad: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + The modulation rate for main PLL (in permyriad, i.e. 0.01%) + minimum: 25 + maximum: 200 + + st,ssc-modmethod: + $ref: /schemas/types.yaml#/definitions/string + description: + The modulation techniques for main PLL. + items: + enum: + - center-spread + - down-spread + +required: + - compatible + - reg + - '#reset-cells' + - '#clock-cells' + - clocks + - st,syscfg + +allOf: + - if: + properties: + compatible: + contains: + const: st,stm32h743-rcc + then: + properties: + '#clock-cells': + const: 1 + description: | + The clock index for the specified type. + clocks: + items: + - description: high speed external (HSE) clock input + - description: low speed external (LSE) clock input + - description: Inter-IC sound (I2S) clock input + st,ssc-modfreq-hz: false + st,ssc-moddepth-permyriad: false + st,ssc-modmethod: false + + else: + properties: + '#clock-cells': + const: 2 + description: | + - The first cell is the clock type, possible values are 0 for + gated clocks and 1 otherwise. + - The second cell is the clock index for the specified type. + clocks: + items: + - description: high speed external (HSE) clock input + - description: Inter-IC sound (I2S) clock input + +additionalProperties: false + +examples: + # Reset and Clock Control Module node: + - | + clock-controller@40023800 { + compatible = "st,stm32f42xx-rcc", "st,stm32-rcc"; + reg = <0x40023800 0x400>; + #clock-cells = <2>; + #reset-cells = <1>; + clocks = <&clk_hse>, <&clk_i2s_ckin>; + st,syscfg = <&pwrcfg>; + st,ssc-modfreq-hz = <10000>; + st,ssc-moddepth-permyriad = <200>; + st,ssc-modmethod = "center-spread"; + }; + - | + clock-controller@58024400 { + compatible = "st,stm32h743-rcc", "st,stm32-rcc"; + reg = <0x58024400 0x400>; + #clock-cells = <1>; + #reset-cells = <1>; + clocks = <&clk_hse>, <&clk_lse>, <&clk_i2s>; + st,syscfg = <&pwrcfg>; + }; + +... |