dt-bindings: rtc: Convert Allwinner A31 RTC to a schema
The newer Allwinner SoCs have an embedded RTC supported in Linux, with a matching Device Tree binding. Now that we have the DT validation in place, let's convert the device tree bindings for that controller over to a YAML schemas. Acked-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Maxime Ripard
Alexandre Belloni
parent
36e63ef358
commit
5a0797599b
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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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$id: http://devicetree.org/schemas/rtc/allwinner,sun6i-a31-rtc.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Allwinner A31 RTC Device Tree Bindings
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maintainers:
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- Chen-Yu Tsai <wens@csie.org>
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- Maxime Ripard <maxime.ripard@bootlin.com>
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properties:
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"#clock-cells":
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const: 1
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compatible:
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oneOf:
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- const: allwinner,sun6i-a31-rtc
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- const: allwinner,sun8i-a23-rtc
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- const: allwinner,sun8i-h3-rtc
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- items:
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- const: allwinner,sun8i-r40-rtc
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- const: allwinner,sun8i-h3-rtc
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- const: allwinner,sun8i-v3-rtc
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- const: allwinner,sun50i-h5-rtc
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- items:
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- const: allwinner,sun50i-a64-rtc
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- const: allwinner,sun8i-h3-rtc
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reg:
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maxItems: 1
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interrupts:
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items:
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- description: RTC Alarm 0
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- description: RTC Alarm 1
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clocks:
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maxItems: 1
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clock-output-names:
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minItems: 1
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maxItems: 3
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description:
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The RTC provides up to three clocks
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- the Low Frequency Oscillator or LOSC, at index 0,
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- the Low Frequency Oscillator External output (X32KFOUT in
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the datasheet), at index 1,
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- the Internal Oscillator, at index 2.
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allOf:
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- $ref: "rtc.yaml#"
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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: allwinner,sun6i-a31-rtc
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then:
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properties:
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clock-output-names:
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minItems: 1
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maxItems: 1
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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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- allwinner,sun8i-a23-rtc
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- allwinner,sun8i-v3-rtc
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then:
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properties:
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clock-output-names:
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minItems: 2
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maxItems: 2
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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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- allwinner,sun8i-h3-rtc
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- allwinner,sun50i-h5-rtc
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then:
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properties:
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clock-output-names:
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minItems: 3
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maxItems: 3
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required:
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- "#clock-cells"
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- compatible
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- reg
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- interrupts
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- clocks
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- clock-output-names
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additionalProperties: false
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examples:
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- |
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rtc: rtc@1f00000 {
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compatible = "allwinner,sun6i-a31-rtc";
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reg = <0x01f00000 0x400>;
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interrupts = <0 40 4>, <0 41 4>;
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clock-output-names = "osc32k";
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clocks = <&ext_osc32k>;
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#clock-cells = <1>;
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};
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...
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@ -1,46 +0,0 @@
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* sun6i Real Time Clock
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RTC controller for the Allwinner A31
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Required properties:
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- compatible : Should be one of the following combinations:
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- "allwinner,sun6i-a31-rtc"
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- "allwinner,sun8i-a23-rtc"
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- "allwinner,sun8i-h3-rtc"
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- "allwinner,sun8i-r40-rtc", "allwinner,sun8i-h3-rtc"
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- "allwinner,sun8i-v3-rtc"
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- "allwinner,sun50i-a64-rtc", "allwinner,sun8i-h3-rtc"
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- "allwinner,sun50i-h5-rtc"
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Where there are two or more compatible strings, this
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denotes the hardware covered by the most specific one
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is backward-compatible with the latter ones, and the
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implementation for the latter ones can be used, albeit
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with reduced functionality.
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- reg : physical base address of the controller and length of
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memory mapped region.
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- interrupts : IRQ lines for the RTC alarm 0 and alarm 1, in that order.
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Required properties for new device trees
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- clocks : phandle to the 32kHz external oscillator
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- clock-output-names : names of up to three clock outputs. See below.
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- #clock-cells : must be equal to 1.
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The RTC provides the following clocks at the given indices:
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- 0: LOSC
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- 1: LOSC external output, known as X32KFOUT in the datasheet.
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This clock is not available on the A31 and is deprecated for old
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device trees still using the "allwinner,sun6i-a31-rtc" compatible.
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- 2: InternalOSC, or internal RC oscillator (A64/H3/H5 only)
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Example:
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rtc: rtc@1f00000 {
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compatible = "allwinner,sun6i-a31-rtc";
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reg = <0x01f00000 0x400>;
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interrupts = <0 40 4>, <0 41 4>;
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clock-output-names = "osc32k";
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clocks = <&ext_osc32k>;
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#clock-cells = <1>;
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};
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