997daa8de6
Add dt-schema for ExynosAuto v920 SoC clock controller. Add device tree clock binding definitions for below CMU blocks. - CMU_TOP - CMU_PERIC0/1 - CMU_MISC - CMU_HSI0/1 Signed-off-by: Sunyeal Hong <sunyeal.hong@samsung.com> Link: https://lore.kernel.org/r/20240821232652.1077701-2-sunyeal.hong@samsung.com Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
163 lines
4.2 KiB
YAML
163 lines
4.2 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/clock/samsung,exynosautov920-clock.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Samsung ExynosAuto v920 SoC clock controller
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maintainers:
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- Sunyeal Hong <sunyeal.hong@samsung.com>
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- Chanwoo Choi <cw00.choi@samsung.com>
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- Krzysztof Kozlowski <krzk@kernel.org>
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- Sylwester Nawrocki <s.nawrocki@samsung.com>
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description: |
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ExynosAuto v920 clock controller is comprised of several CMU units, generating
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clocks for different domains. Those CMU units are modeled as separate device
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tree nodes, and might depend on each other. Root clocks in that clock tree are
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two external clocks:: OSCCLK/XTCXO (38.4 MHz) and RTCCLK/XrtcXTI (32768 Hz).
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The external OSCCLK must be defined as fixed-rate clock in dts.
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CMU_TOP is a top-level CMU, where all base clocks are prepared using PLLs and
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dividers; all other clocks of function blocks (other CMUs) are usually
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derived from CMU_TOP.
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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 clocks available for usage
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in clock consumer nodes are defined as preprocessor macros in
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'include/dt-bindings/clock/samsung,exynosautov920.h' header.
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properties:
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compatible:
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enum:
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- samsung,exynosautov920-cmu-top
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- samsung,exynosautov920-cmu-peric0
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- samsung,exynosautov920-cmu-peric1
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- samsung,exynosautov920-cmu-misc
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- samsung,exynosautov920-cmu-hsi0
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- samsung,exynosautov920-cmu-hsi1
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clocks:
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minItems: 1
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maxItems: 4
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clock-names:
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minItems: 1
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maxItems: 4
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"#clock-cells":
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const: 1
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reg:
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maxItems: 1
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allOf:
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- if:
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properties:
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compatible:
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contains:
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const: samsung,exynosautov920-cmu-top
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then:
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properties:
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clocks:
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items:
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- description: External reference clock (38.4 MHz)
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clock-names:
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items:
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- const: oscclk
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- if:
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properties:
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compatible:
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contains:
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enum:
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- samsung,exynosautov920-cmu-peric0
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- samsung,exynosautov920-cmu-peric1
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then:
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properties:
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clocks:
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items:
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- description: External reference clock (38.4 MHz)
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- description: CMU_PERICn NOC clock (from CMU_TOP)
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- description: CMU_PERICn IP clock (from CMU_TOP)
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clock-names:
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items:
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- const: oscclk
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- const: noc
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- const: ip
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- if:
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properties:
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compatible:
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enum:
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- samsung,exynosautov920-cmu-misc
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- samsung,exynosautov920-cmu-hsi0
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then:
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properties:
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clocks:
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items:
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- description: External reference clock (38.4 MHz)
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- description: CMU_MISC/CMU_HSI0 NOC clock (from CMU_TOP)
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clock-names:
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items:
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- const: oscclk
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- const: noc
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- if:
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properties:
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compatible:
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contains:
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const: samsung,exynosautov920-cmu-hsi1
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then:
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properties:
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clocks:
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items:
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- description: External reference clock (38.4 MHz)
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- description: CMU_HSI1 NOC clock (from CMU_TOP)
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- description: CMU_HSI1 USBDRD clock (from CMU_TOP)
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- description: CMU_HSI1 MMC_CARD clock (from CMU_TOP)
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clock-names:
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items:
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- const: oscclk
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- const: noc
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- const: usbdrd
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- const: mmc_card
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required:
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- compatible
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- "#clock-cells"
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- clocks
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- clock-names
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- reg
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additionalProperties: false
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examples:
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# Clock controller node for CMU_PERIC0
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- |
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#include <dt-bindings/clock/samsung,exynosautov920.h>
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cmu_peric0: clock-controller@10800000 {
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compatible = "samsung,exynosautov920-cmu-peric0";
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reg = <0x10800000 0x8000>;
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#clock-cells = <1>;
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clocks = <&xtcxo>,
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<&cmu_top DOUT_CLKCMU_PERIC0_NOC>,
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<&cmu_top DOUT_CLKCMU_PERIC0_IP>;
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clock-names = "oscclk",
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"noc",
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"ip";
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};
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...
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