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

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Message-ID: <CAGb2v675j-aCLMgPJOzr9yx1XxsUvHRr_K7VnL=p8mSdwpu2jw@mail.gmail.com>
Date:   Mon, 5 Aug 2019 18:16:14 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Ondřej Jirman <megous@...ous.com>
Cc:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        linux-rtc@...r.kernel.org, devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [linux-sunxi] [PATCH 2/3] rtc: sun6i: Add support for H6 RTC

On Fri, Apr 12, 2019 at 8:07 PM megous via linux-sunxi
<linux-sunxi@...glegroups.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>
> ---
>  drivers/rtc/rtc-sun6i.c | 40 ++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 38 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/rtc/rtc-sun6i.c b/drivers/rtc/rtc-sun6i.c
> index 11f56de52179..7375a530c565 100644
> --- a/drivers/rtc/rtc-sun6i.c
> +++ b/drivers/rtc/rtc-sun6i.c
> @@ -41,9 +41,11 @@
>  /* Control register */
>  #define SUN6I_LOSC_CTRL                                0x0000
>  #define SUN6I_LOSC_CTRL_KEY                    (0x16aa << 16)
> +#define SUN6I_LOSC_CTRL_AUTO_SWT_BYPASS                BIT(15)

Manual says bit 14? Or is this different from LOSC_AUTO_SWT_EN?

The rest looks ok.

ChenYu