linux-kernel - Re: [PATCH v10 02/18] clk: sunxi-ng: h616: Add PLL derived 32KHz clock

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Date:   Tue, 22 Feb 2022 21:28:25 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     Andre Przywara <andre.przywara@....com>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>
Cc:     Rob Herring <robh@...nel.org>, Ondrej Jirman <megous@...ous.com>,
        Icenowy Zheng <icenowy@...c.io>,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-clk@...r.kernel.org
Subject: Re: [PATCH v10 02/18] clk: sunxi-ng: h616: Add PLL derived 32KHz
 clock

On 2/11/22 6:26 AM, Andre Przywara wrote:
> The RTC section of the H616 manual mentions in a half-sentence the
> existence of a clock "32K divided by PLL_PERI(2X)". This is used as
> one of the possible inputs for the mux that selects the clock for the
> 32 KHz fanout pad. On the H616 this is routed to pin PG10, and some
> boards use that clock output to compensate for a missing 32KHz crystal.
> On the OrangePi Zero2 this is for instance connected to the LPO pin of
> the WiFi/BT chip.
> The new RTC clock binding requires this clock to be named as one input
> clock, so we need to expose this to the DT. In contrast to the D1 SoC
> there does not seem to be a gate for this clock, so just use a fixed
> divider clock, using a newly assigned clock number.
> 
> Signed-off-by: Andre Przywara <andre.przywara@....com>

Reviewed-by: Samuel Holland <samuel@...lland.org>