linux-kernel - Re: [PATCH 02/15] dt-bindings: rtc: sun6i-rtc: Add compatible strings for pre-H6 variants

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Message-ID: <20181128101906.xkqaoezxodz25c3x@flea>
Date:   Wed, 28 Nov 2018 11:19:06 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-rtc@...r.kernel.org,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH 02/15] dt-bindings: rtc: sun6i-rtc: Add compatible
 strings for pre-H6 variants

On Wed, Nov 28, 2018 at 05:29:59PM +0800, Chen-Yu Tsai wrote:
> While doing Bluetooth enablement for various boards based on various
> Allwinner SoCs, minor differences in the RTC modules were found. These
> include a lack of an external clock output (A31), different internal
> oscillator frequencies (H3/H5/A64/V3/V3s), different regulator voltage
> settings (H5/H6), and the presence of miscellaneous registers unrelated
> to the RTC (A64/R40/H5/H6). The datasheet also describes different number
> of registers for non-volatile storage, though based on actual experiments
> the actual number is the same across the board.
> 
> This patch adds a list of all pre-H6 variants, grouped by the internal
> oscillator's clock rate, regulator settings, and the presence of the
> external clock output. Combinations are introduced for the variants that
> have miscellaneous registers.
> 
> The RTC block in the H6 also handles the 24 MHz DCXO. This will require
> more device tree binding changes and will be done later.
> 
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>

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

Maxime

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

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