On Wed, Nov 28, 2018 at 05:30:03PM +0800, Chen-Yu Tsai wrote: > Amongst the Allwinner SoCs that have seen some kind of coverage by the > linux-sunxi community, whether it be mainline Linux or U-boot support, > or just available datasheets, most newer chips use the RTC design first > seen in the A31 (sun6i). > > Overall there have been some minor differences. This patch covers the > following: > > - average clock rate of the internal RC oscillator > + presence of fixed and adjustable prescaler for this clock > - availability of an external (to the SoC) clock output > > One major difference regarding the H6 is the 24 MHz crystal is now > routed through the RTC, as a digitally compensated oscillator (DCXO). > This is not covered in this patch and will be supported later. > > Other differences are either unrelated to RTC or clock functionality, > such as boot or crypto related registers, or the driver simply doesn't > use the feature in question. One example of the latter is the > calibration function for the RC oscillator. We consider this clock to > be very bad and avoid using it. > > Signed-off-by: Chen-Yu Tsai <wens@xxxxxxxx> Acked-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxx> Maxime -- Maxime Ripard, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
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