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Date:   Wed, 28 Nov 2018 11:22:12 +0100
From:   Maxime Ripard <maxime.ripard@bootlin.com>
To:     Chen-Yu Tsai <wens@csie.org>
Cc:     Alexandre Belloni <alexandre.belloni@bootlin.com>,
        Alessandro Zummo <a.zummo@towertech.it>,
        Michael Turquette <mturquette@baylibre.com>,
        Stephen Boyd <sboyd@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        linux-arm-kernel@lists.infradead.org, linux-rtc@vger.kernel.org,
        linux-clk@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-sunxi@googlegroups.com
Subject: Re: [PATCH 06/15] rtc: sun6i: Add support for different variants
Message-ID: <20181128102212.4sodbbk6uu52nug3@flea>
References: <20181128093013.24442-1-wens@csie.org>
 <20181128093013.24442-7-wens@csie.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).
>=20
> Overall there have been some minor differences. This patch covers the
> following:
>=20
>   - 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
>=20
> 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.
>=20
> 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.
>=20
> Signed-off-by: Chen-Yu Tsai <wens@csie.org>

Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>

Maxime

--=20
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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