Add dt-schema for Exynos Auto v920 SoC clock controller. Signed-off-by: Sunyeal Hong <sunyeal.hong@xxxxxxxxxxx> --- .../clock/samsung,exynosautov920-clock.yaml | 115 ++++++++++++++++++ 1 file changed, 115 insertions(+) create mode 100644 Documentation/devicetree/bindings/clock/samsung,exynosautov920-clock.yaml diff --git a/Documentation/devicetree/bindings/clock/samsung,exynosautov920-clock.yaml b/Documentation/devicetree/bindings/clock/samsung,exynosautov920-clock.yaml new file mode 100644 index 000000000000..3e5e408c8336 --- /dev/null +++ b/Documentation/devicetree/bindings/clock/samsung,exynosautov920-clock.yaml @@ -0,0 +1,115 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/clock/samsung,exynosautov920-clock.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Samsung Exynos Auto v920 SoC clock controller + +maintainers: + - Sunyeal Hong <sunyeal.hong@xxxxxxxxxxx> + - Chanwoo Choi <cw00.choi@xxxxxxxxxxx> + - Krzysztof Kozlowski <krzk@xxxxxxxxxx> + - Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx> + +description: | + Exynos Auto v920 clock controller is comprised of several CMU units, generating + clocks for different domains. Those CMU units are modeled as separate device + tree nodes, and might depend on each other. Root clocks in that clock tree are + two external clocks:: OSCCLK/XTCXO (38.4 MHz) and RTCCLK/XrtcXTI (32768 Hz). + The external OSCCLK must be defined as fixed-rate clock in dts. + + CMU_TOP is a top-level CMU, where all base clocks are prepared using PLLs and + dividers; all other clocks of function blocks (other CMUs) are usually + derived from CMU_TOP. + + Each clock is assigned an identifier and client nodes can use this identifier + to specify the clock which they consume. All clocks available for usage + in clock consumer nodes are defined as preprocessor macros in + 'include/dt-bindings/clock/samsung,exynosautov920.h' header. + +properties: + compatible: + enum: + - samsung,exynosautov920-cmu-top + - samsung,exynosautov920-cmu-peric0 + + clocks: + minItems: 1 + maxItems: 3 + + clock-names: + minItems: 1 + maxItems: 3 + + "#clock-cells": + const: 1 + + reg: + maxItems: 1 + +allOf: + - if: + properties: + compatible: + contains: + const: samsung,exynosautov920-cmu-top + + then: + properties: + clocks: + items: + - description: External reference clock (38.4 MHz) + + clock-names: + items: + - const: oscclk + + - if: + properties: + compatible: + contains: + const: samsung,exynosautov920-cmu-peric0 + + then: + properties: + clocks: + items: + - description: External reference clock (38.4 MHz) + - description: CMU_PERIC0 NOC clock (from CMU_TOP) + - description: CMU_PERIC0 IP clock (from CMU_TOP) + + clock-names: + items: + - const: oscclk + - const: dout_clkcmu_peric0_noc + - const: dout_clkcmu_peric0_ip + +required: + - compatible + - "#clock-cells" + - clocks + - clock-names + - reg + +additionalProperties: false + +examples: + # Clock controller node for CMU_PERIC0 + - | + #include <dt-bindings/clock/samsung,exynosautov920.h> + + cmu_peric0: clock-controller@10800000 { + compatible = "samsung,exynosautov920-cmu-peric0"; + reg = <0x10800000 0x8000>; + #clock-cells = <1>; + + clocks = <&xtcxo>, + <&cmu_top DOUT_CLKCMU_PERIC0_NOC>, + <&cmu_top DOUT_CLKCMU_PERIC0_IP>; + clock-names = "oscclk", + "dout_clkcmu_peric0_noc", + "dout_clkcmu_peric0_ip"; + }; + +... -- 2.43.2
