On 20/01/2017 at 16:56:37 +0100, Maxime Ripard wrote : > Hi, > > The RTC used in the A31 and later SoC has an accuracy issue, which is > already significant even after a couple of hours. > > This is due to the fact that the oscillator used by default is an internal > and very inaccurate one. > > A first attempt at fixing that by switching to the external oscillator was > done in the patch "rtc: sun6i: Switch to the external oscillator". However, > it turned out to be problematic since it was tracked properly in the clock > framework, which might lead to some clocks being disabled, even though > their devices were not notified. > > This is a second attempt, this time by making it part of the CCF. It > turned out to be a bit more complicated than one would expect since the mux > found inside the RTC also controls one of the input of the main clock unit. > Therefore, it needs to be probed before the main clock unit driver. > > Let me know what you think, > Maxime > > Maxime Ripard (6): > rtc: sun6i: Expose the 32kHz oscillator > rtc: sun6i: Add some locking > rtc: sun6i: Disable the build as a module > rtc: sun6i: Force the mux to the external oscillator > ARM: sun8i: a23/a33: Enable the real LOSC and use it > ARM: sun8i: a23/a33: Add the oscillators accuracy > As Chen-Yu mentioned, maybe you can reorder some patches so they can go in stable. > Documentation/devicetree/bindings/rtc/sun6i-rtc.txt | 8 +- > arch/arm/boot/dts/sun8i-a23-a33.dtsi | 15 +- > drivers/rtc/Kconfig | 2 +- > drivers/rtc/rtc-sun6i.c | 189 +++++++++++-- > 4 files changed, 181 insertions(+), 33 deletions(-) > > base-commit: 99cef370ac9939df2aeb16c96d07e842b2fa8201 > -- > git-series 0.8.11 -- Alexandre Belloni, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
