Message ID | 20230104052506.575619-3-dennis@sparkcharge.io |
---|---|
State | Superseded |
Headers | show |
Series | rtc: Set M41T82 & M41T83 xtal load capacitance from DT | expand |
On 04/01/2023 06:25, Dennis Lambe Jr wrote: > The ST m41t82 and m41t83 support programmable load capacitance from 3.5 > pF to 17.4 pF. The hardware defaults to 12.5 pF. > > The accuracy of the xtal can be calibrated precisely by adjusting the > load capacitance. > > Add default, minimum, and maximum for the standard rtc property > quartz-load-femtofarads on compatible devices. > > Signed-off-by: Dennis Lambe Jr <dennis@sparkcharge.io> > --- > Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Best regards, Krzysztof
diff --git a/Documentation/devicetree/bindings/rtc/st,m41t80.yaml b/Documentation/devicetree/bindings/rtc/st,m41t80.yaml index fc9c6da6483f..6673adf6e99b 100644 --- a/Documentation/devicetree/bindings/rtc/st,m41t80.yaml +++ b/Documentation/devicetree/bindings/rtc/st,m41t80.yaml @@ -33,6 +33,11 @@ properties: "#clock-cells": const: 1 + quartz-load-femtofarads: + default: 12500 + minimum: 3500 + maximum: 17375 + clock-output-names: maxItems: 1 description: From common clock binding to override the default output clock name. @@ -46,6 +51,17 @@ properties: allOf: - $ref: rtc.yaml + - if: + not: + properties: + compatible: + contains: + enum: + - st,m41t82 + - st,m41t83 + then: + properties: + quartz-load-femtofarads: false unevaluatedProperties: false
The ST m41t82 and m41t83 support programmable load capacitance from 3.5 pF to 17.4 pF. The hardware defaults to 12.5 pF. The accuracy of the xtal can be calibrated precisely by adjusting the load capacitance. Add default, minimum, and maximum for the standard rtc property quartz-load-femtofarads on compatible devices. Signed-off-by: Dennis Lambe Jr <dennis@sparkcharge.io> --- Notes: v1 -> v2: remove accidental wakeup-sources line suggested by Krzysztof Kozlowski spelling fix in changelog .../devicetree/bindings/rtc/st,m41t80.yaml | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)