Re: [PATCH 3/4] rtc: ds1307: add calibration of_ for mt41txx chips.
From: Rob Herring <robh+dt@kernel.org>
Date: 2018-05-08 17:40:49
Also in:
linux-devicetree, lkml
On Tue, May 8, 2018 at 9:56 AM, Giulio Benetti [off-list ref] wrote:
m41txx chips can hold a calibration value to get really near to real tick value.
Typo in the subject.
Add calibration property(ranging between (-31) and 31), so on every probe calibration value will be written to rtc. This is because ic could loose supply due to low battery. Signed-off-by: Giulio Benetti <redacted> --- .../devicetree/bindings/rtc/rtc-ds1307.txt | 2 ++
Put all the binding changes in separate patch (or maybe 2: new compatible and new properties).
quoted hunk ↗ jump to hunk
drivers/rtc/rtc-ds1307.c | 33 +++++++++++++++++++ 2 files changed, 35 insertions(+)diff --git a/Documentation/devicetree/bindings/rtc/rtc-ds1307.txt b/Documentation/devicetree/bindings/rtc/rtc-ds1307.txt index ce6469c1a516..d3d70a5495c5 100644 --- a/Documentation/devicetree/bindings/rtc/rtc-ds1307.txt +++ b/Documentation/devicetree/bindings/rtc/rtc-ds1307.txt@@ -34,6 +34,8 @@ Optional properties: - trickle-diode-disable : ds1339, ds1340 and ds 1388 only Do not use internal trickle charger diode Should be given if internal trickle charger diode should be disabled +- calibration: m41t0, m41t00, m41t11 only
Needs a vendor prefix. Calibration of what and what are the units?
+ Set calibration value to correct external bias, ranging between (-31) and 31.
Example:
rtc1: ds1339@68 {