[PATCH v15 0/6] add Amlogic A1 clock controller drivers

[Dmitry Rokosov]

Jerome,

On Tue, May 30, 2023 at 07:49:33PM +0300, Dmitry Rokosov wrote:
> Jerome,
> 
> On Tue, May 30, 2023 at 06:14:01PM +0200, Jerome Brunet wrote:
> > On Wed 17 May 2023 at 16:33, Dmitry Rokosov <ddrokosov at sberdevices.ru> wrote:
> > 
> > > A1 SoC has four clock controllers on the board: PLL, Peripherals, CPU,
> > > and Audio. The audio clock controller is different from others, but the
> > > rest are very similar from a functional and regmap point of view.
> > > This patch series add support for Amlogic A1 PLL and Peripherals clock
> > > drivers.
> > > It blocks all A1 peripherals mainline support and a couple of patch series,
> > > which were already reviewed and acked, but weren't merged due to pending
> > > clock controller drivers series, e.g.
> > > https://lore.kernel.org/all/20230418111612.19479-1-ddrokosov@sberdevices.ru/
> > >
> > > TODO: CPU and Audio clock controllers are not included in this patch
> > > series, it will be sent later. The following clks from these controllers
> > > are not supported for now:
> > > * Audio clks - vad, mclk_vad, mclk_d, resample_a, locker_in, mclk_b,
> > >    pdmdclk, pdmsysclk, eqdrc, spdifin, mclk_a, audio2_toaudiotop,
> > >    audio2_tovad, audio2_toddr_vad, audio2_tdmin_vad, audio2_pdm,
> > >    audio2_ddr_arb, audio_audiolocker, audio_eqdrc, audio_resamplea,
> > >    audio_spdifin, audio_toddrb, audio_toddra, audio_frddrb, audio_frddra,
> > >    audio_tdmoutb, audio_tdmouta, audio_loopbacka, audio_tdminlb,
> > >    audio_tdminb, audio_tdmina, audio_ddr_arb, mclk_c
> > >
> > > * CPU clks: cpu_fixed_source_sel0, cpu_fixed_source_div0,
> > >             cpu_fixed_source_sel1, cpu_fixed_source_div1, cpu_clk
> > >
> > > Validation:
> > > * to double check all clk flags run below helper script:
> > >     pushd /sys/kernel/debug/clk
> > >     for f in *; do
> > >         if [[ -f "$f/clk_flags" ]]; then
> > >             flags="$(cat $f/clk_flags | awk '{$1=$1};1' | sed ':a;N;$!ba;s/\n/ | /g')"
> > >             echo -e "$f: $flags"
> > >         fi
> > >     done
> > >     popd
> > >
> > > * to trace current clks state use '/sys/kernel/debug/clk/clk_dump' node
> > >   with jq post-processing:
> > >     $ cat /sys/kernel/debug/clk/clk_dump | jq '.' > clk_dump.json
> > >
> > > * to debug clk rate propagation, compile kernel with the following
> > >   definition:
> > >     $ sed -i "s/undef CLOCK_ALLOW_WRITE_DEBUGFS/define CLOCK_ALLOW_WRITE_DEBUGFS/g" drivers/clk/clk.c
> > >   after that, clk_rate debug node for each clock will be available for
> > >   write operation
> > >
> > 
> > Applied, Thx
> 
> Thank you very much!
> 
> I noticed that you have applied version 15 of the patch. If I understand
> correctly, this is because CLK_SET_RATE_NO_REPARENT for all RTC children
> is preferred from your perspective. I agree with this decision. However,
> version 16 includes a small refactoring patch that corrects a
> misstyping by changing all sys_* related dividers and gates to
> read-only operations, since they are set up from BootROM. Should I
> submit this patch separately at a later time?
> 
> Also could you please clarify the official process for handling these
> patches? Currently, I don't see them in the linux-amlogic for-next
> branches. Is there a separate repository for clock changes? I believe
> the next repository is a fork of the clock framework, but unfortunately,
> I cannot seem to locate it on git.kernel.org... Apologies for the
> potentially simple questions...

I came across your development tree on GitHub, and I noticed that you've
applied the latest v16 version. Apologies for the noise!

https://github.com/BayLibre/clk-meson/commit/84af914404dbc01f388c440cac72428784b8a161#diff-9e8258bc44803391f868de351058eef033cf3828d52801e1711f786501bc5911

-- 
Thank you,
Dmitry

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