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.
Reviewed-by: Daire McNamara <daire.mcnamara@xxxxxxxxxxxxx>
Signed-off-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
---
.../bindings/rtc/microchip,mfps-rtc.yaml | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/Documentation/devicetree/bindings/rtc/microchip,mfps-rtc.yaml b/Documentation/devicetree/bindings/rtc/microchip,mfps-rtc.yaml
index a2e984ea3553..1ffd97dbe6b9 100644
--- a/Documentation/devicetree/bindings/rtc/microchip,mfps-rtc.yaml
+++ b/Documentation/devicetree/bindings/rtc/microchip,mfps-rtc.yaml
@@ -31,11 +31,18 @@ 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 +55,12 @@ 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>;
};
...
--
2.35.1
