linux-kernel - Re: [PATCH] rtc: sun6i: disable automatic clock input switching

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Message-ID: <CAGb2v64SCQbfW=kKU5306fk8MrhBtsjpXX1YaWsXHV5fso-dcA@mail.gmail.com>
Date: Wed, 4 Sep 2024 22:46:57 +0800
From: Chen-Yu Tsai <wens@...e.org>
To: Michael Walle <mwalle@...nel.org>
Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>, 
	Jernej Skrabec <jernej.skrabec@...il.com>, Samuel Holland <samuel@...lland.org>, 
	linux-rtc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rtc: sun6i: disable automatic clock input switching

On Wed, Jul 31, 2024 at 3:49 AM Michael Walle <mwalle@...nel.org> wrote:
>
> The V3(s) will detect a valid external low frequency clock and if it is
> not present will automatically switch to the internal one. This might
> hide bugs and (hardware) configuration errors. It's even worse because
> the internal RTC runs significantly slower (32.000Hz vs 32.768Hz).
> Fortunately for us, the V3(s) has an (undocumented) bypass of this
> switching and the driver already supports it by setting the
> .has_auto_swt flag.
>
> Signed-off-by: Michael Walle <mwalle@...nel.org>

Acked-by: Chen-Yu Tsai <wens@...e.org>