linux-kernel - Re: [PATCH v2 1/2] rtc: sun6i: Make external 32k oscillator optional

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Date:   Mon, 9 Mar 2020 16:17:37 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Jernej Skrabec <jernej.skrabec@...l.net>
Cc:     wens@...e.org, robh+dt@...nel.org, a.zummo@...ertech.it,
        alexandre.belloni@...tlin.com,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-rtc@...r.kernel.org
Subject: Re: [PATCH v2 1/2] rtc: sun6i: Make external 32k oscillator optional

On Sun, Mar 08, 2020 at 02:58:48PM +0100, Jernej Skrabec wrote:
> Some boards, like OrangePi PC2 (H5), OrangePi Plus 2E (H3) and Tanix TX6
> (H6) don't have external 32kHz oscillator. Till H6, it didn't really
> matter if external oscillator was enabled because HW detected error and
> fall back to internal one. H6 has same functionality but it's the first
> SoC which have "auto switch bypass" bit documented and always enabled in
> driver. This prevents RTC to work correctly if external crystal is not
> present on board. There are other side effects - all peripherals which
> depends on this clock also don't work (HDMI CEC for example).
>
> Make clocks property optional. If it is present, select external
> oscillator. If not, stay on internal.
>
> Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>

Acked-by: Maxime Ripard <mripard@...nel.org>

Maxime

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