| * sun6i Real Time Clock |
| |
| RTC controller for the Allwinner A31 |
| |
| Required properties: |
| - compatible : Should be one of the following combinations: |
| - "allwinner,sun6i-a31-rtc" |
| - "allwinner,sun8i-a23-rtc" |
| - "allwinner,sun8i-h3-rtc" |
| - "allwinner,sun8i-r40-rtc", "allwinner,sun8i-h3-rtc" |
| - "allwinner,sun8i-v3-rtc" |
| - "allwinner,sun50i-a64-rtc", "allwinner,sun8i-h3-rtc" |
| - "allwinner,sun50i-h5-rtc" |
| |
| Where there are two or more compatible strings, this |
| denotes the hardware covered by the most specific one |
| is backward-compatible with the latter ones, and the |
| implementation for the latter ones can be used, albeit |
| with reduced functionality. |
| |
| - reg : physical base address of the controller and length of |
| memory mapped region. |
| - interrupts : IRQ lines for the RTC alarm 0 and alarm 1, in that order. |
| |
| Required properties for new device trees |
| - clocks : phandle to the 32kHz external oscillator |
| - clock-output-names : names of up to three clock outputs. See below. |
| - #clock-cells : must be equal to 1. |
| |
| The RTC provides the following clocks at the given indices: |
| - 0: LOSC |
| - 1: LOSC external output, known as X32KFOUT in the datasheet. |
| This clock is not available on the A31 and is deprecated for old |
| device trees still using the "allwinner,sun6i-a31-rtc" compatible. |
| - 2: InternalOSC, or internal RC oscillator (A64/H3/H5 only) |
| |
| Example: |
| |
| rtc: rtc@1f00000 { |
| compatible = "allwinner,sun6i-a31-rtc"; |
| reg = <0x01f00000 0x400>; |
| interrupts = <0 40 4>, <0 41 4>; |
| clock-output-names = "osc32k"; |
| clocks = <&ext_osc32k>; |
| #clock-cells = <1>; |
| }; |
