Am 01.02.2016 um 16:55 schrieb Alexandre Belloni: > On 01/02/2016 at 09:27:50 -0600, Rob Herring wrote : >> On Fri, Jan 29, 2016 at 09:40:02AM +0100, Oleksij Rempel wrote: >>> Document Alphascale asm9260 RTC bindings >>> >>> Signed-off-by: Oleksij Rempel <linux@xxxxxxxxxxxxxxxx> >>> --- >>> .../bindings/rtc/alphascale,asm9260-rtc.txt | 25 ++++++++++++++++++++++ >>> 1 file changed, 25 insertions(+) >>> create mode 100644 Documentation/devicetree/bindings/rtc/alphascale,asm9260-rtc.txt >>> >>> diff --git a/Documentation/devicetree/bindings/rtc/alphascale,asm9260-rtc.txt b/Documentation/devicetree/bindings/rtc/alphascale,asm9260-rtc.txt >>> new file mode 100644 >>> index 0000000..2c0ff3c >>> --- /dev/null >>> +++ b/Documentation/devicetree/bindings/rtc/alphascale,asm9260-rtc.txt >>> @@ -0,0 +1,25 @@ >>> +* Alphascale asm9260 SoC Real Time Clock >>> + >>> +Required properties: >>> +- compatible: Should be "alphascale,asm9260-rtc" >>> +- reg: Physical base address of the controller and length >>> + of memory mapped region. >>> +- interrupts: IRQ line for the RTC. >>> +- clocks: Reference to the clock entry. >>> +- clock-names: should contain: >>> + * "ahb" for the SoC RTC clock >>> + >>> +Optional: >>> +- calibration: calibration value for 1 sec period. >>> + Max value for forward calibration is 0x1ffff (131071), >>> + Min value for backward calibration is 0xfffe0001 (-131071). >> >> This should be prefixed with 'alphascale,' >> >> How is this value determined? >> > > I think this should stay in userspace, see that series: > https://groups.google.com/forum/#!topic/rtc-linux/HGQqiHnMiuw > > It quite often depends on environmental things like temperature so it may be updated at runtime. > I partially agree. IMO default configuration should work properly by 20C. My devkit provide terrible results without default offset. -- Regards, Oleksij
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