From mboxrd@z Thu Jan  1 00:00:00 1970
From: Maxime Ripard <maxime.ripard-LDxbnhwyfcJBDgjK7y7TUQ@public.gmane.org>
Subject: Re: [PATCH 06/15] rtc: sun6i: Add support for different variants
Date: Wed, 28 Nov 2018 11:22:12 +0100
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To: Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>
Cc: Alexandre Belloni <alexandre.belloni-LDxbnhwyfcJBDgjK7y7TUQ@public.gmane.org>, Alessandro Zummo <a.zummo-BfzFCNDTiLLj+vYz1yj4TQ@public.gmane.org>, Michael Turquette <mturquette-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>, Stephen Boyd <sboyd-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-rtc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-clk-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
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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-jdAy2FN1RRM@public.gmane.org>

Acked-by: Maxime Ripard <maxime.ripard-LDxbnhwyfcJBDgjK7y7TUQ@public.gmane.org>

Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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