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Commit 1366e010 authored by Martin Blumenstingl's avatar Martin Blumenstingl Committed by Alexandre Belloni
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dt-bindings: rtc: add device-tree bindings for the Amlogic Meson RTC 



The 32-bit Amlogic Meson SoCs (Meson6, Meson8, Meson8b and Meson8m2)
have a built-in RTC block.
It has the following inputs:
- an 32.768kHz crystal oscillator
- an interrupt line
- a reset line
- 0.9V voltage input

Signed-off-by: default avatarBen Dooks <ben.dooks@codethink.co.uk>
[resurrected patches from Ben after 2 years]
Signed-off-by: default avatarMartin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
parent 09832dc0

Documentation/devicetree/bindings/rtc/rtc-meson.txt

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+35 −0
Original line number Original line Diff line number Diff line 
* Amlogic Meson6, Meson8, Meson8b and Meson8m2 RTC



Required properties:

- compatible: should be one of the following describing the hardware:

	* "amlogic,meson6-rtc"

	* "amlogic,meson8-rtc"

	* "amlogic,meson8b-rtc"

	* "amlogic,meson8m2-rtc"



- reg: physical register space for the controller's memory mapped registers.

- interrupts: the interrupt line of the RTC block.

- clocks: reference to the external 32.768kHz crystal oscillator.

- vdd-supply: reference to the power supply of the RTC block.

- resets: reset controller reference to allow reset of the controller



Optional properties for the battery-backed non-volatile memory:

- #address-cells: should be 1 to address the battery-backed non-volatile memory

- #size-cells: should be 1 to reference the battery-backed non-volatile memory



Optional child nodes:

- see ../nvmem/nvmem.txt



Example:



	rtc: rtc@740 {

		compatible = "amlogic,meson6-rtc";

		reg = <0x740 0x14>;

		interrupts = <GIC_SPI 72 IRQ_TYPE_EDGE_RISING>;

		clocks = <&rtc32k_xtal>;

		vdd-supply = <&rtc_vdd>;

		resets = <&reset RESET_RTC>;



		#address-cells = <1>;

		#size-cells = <1>;

	};