Date:   Fri, 7 Dec 2018 10:25:12 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     alexandre.belloni@...tlin.com
Cc:     Maxime Ripard <maxime.ripard@...tlin.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-rtc@...r.kernel.org, linux-clk <linux-clk@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Mike Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v2 00/14] rtc: sun6i: clock rework and pre-H6 SoC support

On Fri, Dec 7, 2018 at 4:34 AM Alexandre Belloni
<alexandre.belloni@...tlin.com> wrote:
>
> On 06/12/2018 13:49:10+0800, Chen-Yu Tsai wrote:
> > Hi,
> >
> > On Mon, Dec 3, 2018 at 10:58 PM Chen-Yu Tsai <wens@...e.org> wrote:
> > >
> > > Hi everyone,
> > >
> > > This is v2 of my rtc-sun6i clean-up series.
> > >
> > > Changes since v1:
> > >
> > >   - Collected tags
> > >   - Dropped patch "clk: sunxi-ng: r40: Force LOSC parent to RTC LOSC
> > >     output"; already merged
> > >   - Removed H6 compatible CLK_OF_DECLARE_DRIVER entry that wasn't
> > >     overlooked
> > >   - Only export IOSC clock for A64/H3/H5
> > >
> > > Original cover letter, with patch numbers corrected, follows:
> > >
> > > This series was started as part of enabling Bluetooth on various
> > > Allwinner SBCs. The bluetooth controller requires a precise 32.768 kHz
> > > clock fed to it to correctly detect the frequency of its main oscillator.
> > > This clock signal is provided by the RTC, either directly from a special
> > > pin on the SoC, or some clock output function from the clock controllers.
> > > I found that the clock-related properties of the RTC on later SoCs were
> > > incorrect or missing.
> > >
> > > This series reworks the compatible strings and clock parts of the device
> > > tree bindings for sun6i-rtc. Currently we assume most Allwinner SoCs use
> > > the same sun6i-rtc variant, when in fact they do not. The differences
> > > that matter with regards to clocks are a) the A31 does not have an extra
> > > external output for the RTC 32K clock, while most of the others do;
> > > b) the clock frequency of the internal RC oscillator is different on
> > > some SoCs; c) on the H6 the RTC also handles the 24 MHz DCXO, which
> > > feeds the system HOSC. The last difference, and by extension the H6, are
> > > not covered in this series.
> > >
> > > Patch 1 cleans up the clock-related section of the RTC device tree
> > > binding. This would make it easier to read and easier to add additional
> > > clocks.
> > >
> > > Patch 2 adds compatible strings for all identified variants introduced
> > > prior to the H6.
> > >
> > > Patch 3 deprecates the external clock output for the A31. The A31 does
> > > not have this output, so it's introduction and usage was an error.
> > >
> > > Patch 4 adds a clock output for the RTC's internal oscillator to the
> > > device tree binding. This feeds the PRCM in some SoCs.
> > >
> > > Patch 5 adds a default clock name for the LOSC to the RTC driver.
> > >
> > > Patch 6 adds support for different hardware variants to the RTC driver.
> > >
> > > Patch 7 adds support for all known pre-H6 variants.
> > >
> > > Patch 8 exposes the RTC's internal oscillator through the device tree.
> > >
> > > Patch 9 through 14 adds an RTC node or fixes up the RTC device node
> > > address ranges, clock properties, names of existing clocks, and adds
> > > accuracy properties for the external fixed oscillators.
> > >
> > > The clock names require fixing because the sunxi clock driver implicitly
> > > depends on the HOSC and LOSC being named "osc24M" and "osc32k". The
> > > "fixes" to the clock hierarchy introduced in this series means the names
> > > must also be shuffled around or the in kernel representation would be
> > > incorrect. This has been the case since the sunxi-ng drivers were
> > > introduced. There are plans to address this, but the code is still in its
> > > early stages.
> > >
> > > Please have a look.
> > >
> > > Thanks
> > > ChenYu
> > >
> > > Chen-Yu Tsai (14):
> > >   dt-bindings: rtc: sun6i-rtc: Rewrite clock outputs as a list
> > >   dt-bindings: rtc: sun6i-rtc: Add compatible strings for pre-H6
> > >     variants
> > >   dt-bindings: rtc: sun6i-rtc: Deprecate external clock output for A31
> > >   dt-bindings: rtc: sun6i-rtc: Export internal RC oscillator
> > >   rtc: sun6i: Add default clock name for LOSC
> > >   rtc: sun6i: Add support for different variants
> > >   rtc: sun6i: Add support for all known pre-H6 variants
> > >   rtc: sun6i: Expose internal oscillator through device tree
>
> I've applied the above patches. However, for whatever reason, patch 3
> didn't apply without some fuzz, please check.

Sorry about that. The fuzz was due to a patch that I forgot to send out.
The fixup looks good.

I applied the remaining device tree patches. I'll send out the missing
patch, which fixes the register range in the binding example, later.

Thanks!
ChenYu

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