linux-kernel - Re: [PATCH v2 2/3] rtc: sun6i: Add support for H6 RTC

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Date:   Thu, 22 Aug 2019 23:16:01 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     megous@...ous.com
Cc:     Alessandro Zummo <a.zummo@...ertech.it>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>, linux-rtc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v2 2/3] rtc: sun6i: Add support for H6 RTC

On 20/08/2019 17:19:33+0200, megous@...ous.com wrote:
> From: Ondrej Jirman <megous@...ous.com>
> 
> RTC on H6 is mostly the same as on H5 and H3. It has slight differences
> mostly in features that are not yet supported by this driver.
> 
> Some differences are already stated in the comments in existing code.
> One other difference is that H6 has extra bit in LOSC_CTRL_REG, called
> EXT_LOSC_EN to enable/disable external low speed crystal oscillator.
> 
> It also has bit EXT_LOSC_STA in LOSC_AUTO_SWT_STA_REG, to check whether
> external low speed oscillator is working correctly.
> 
> This patch adds support for enabling LOSC when necessary:
> 
> - during reparenting
> - when probing the clock
> 
> H6 also has capacbility to automatically reparent RTC clock from
> external crystal oscillator, to internal RC oscillator, if external
> oscillator fails. This is enabled by default. Disable it during
> probe.
> 
> Signed-off-by: Ondrej Jirman <megous@...ous.com>
> Reviewed-by: Chen-Yu Tsai <wens@...e.org>
> ---
>  drivers/rtc/rtc-sun6i.c | 40 ++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 38 insertions(+), 2 deletions(-)
> 
Applied, thanks.

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com