Commit 8e8fbab4 authored by Conor Dooley's avatar Conor Dooley Committed by Stephen Boyd
Browse files

dt-bindings: rtc: add refclk to mpfs-rtc 



The rtc on PolarFire SoC does not use the AHB clock as its reference
frequency, but rather a 1 MHz refclk that it shares with MTIMER. Add
this second clock to the binding as a required property.

Fixes: 4cbcc0d7 ("dt-bindings: rtc: add bindings for microchip mpfs rtc")
Reviewed-by: default avatarDaire McNamara <daire.mcnamara@microchip.com>
Acked-by: default avatarKrzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: default avatarConor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20220413075835.3354193-7-conor.dooley@microchip.com


Acked-by: default avatarPalmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: default avatarStephen Boyd <sboyd@kernel.org>
parent 8be99c7b

Documentation/devicetree/bindings/rtc/microchip,mfps-rtc.yaml

+12 −3
Original line number Diff line number Diff line
@@ -31,11 +31,19 @@ properties: 
          to that of the RTC's count register.



  clocks:

    maxItems: 1

    items:

      - description: |

          AHB clock

      - description: |

          Reference clock: divided by the prescaler to create a time-based

          strobe (typically 1 Hz) for the calendar counter. By default, the rtc

          on the PolarFire SoC shares it's reference with MTIMER so this will

          be a 1 MHz clock.



  clock-names:

    items:

      - const: rtc

      - const: rtcref



required:

  - compatible
@@ -48,11 +56,12 @@ additionalProperties: false 


examples:

  - |

    #include "dt-bindings/clock/microchip,mpfs-clock.h"

    rtc@20124000 {

        compatible = "microchip,mpfs-rtc";

        reg = <0x20124000 0x1000>;

        clocks = <&clkcfg 21>;

        clock-names = "rtc";

        clocks = <&clkcfg CLK_RTC>, <&clkcfg CLK_RTCREF>;

        clock-names = "rtc", "rtcref";

        interrupts = <80>, <81>;

    };

...