Re: [PATCH v6 00/18] Modernize rest of the krait drivers

Ansuel Smith
2022-04-13T17:48:25Z

On Wed, Apr 13, 2022 at 08:31:31PM +0300, Dmitry Baryshkov wrote:
> On 22/03/2022 02:15, Ansuel Smith wrote:
> > This is a follow-up to the ipq806x gcc modernize series. Manu cleanup
> > changes and also some discoveries of wrong definition notice only with
> > all these conversions.
>
> General comment regarding this patch series. It contains fixes, clock
> conversion for several drivers, dts fixes, etc. It's, for example, not
> straightforwardly obvious if Bjorn can pickup patches 04 or 06 without
> picking up other patches.
>
> If would be best if you can split this series or at least pull fixes to be
> the first patches in the pile.
>

Considering that now this is grown to 21 patch in v7 (that is still have
to push)... Yes I think I have to split this...
Wonder if you can give me some hint.

- Series for krait-cc
- Series for kpss-acc/gcc
- Single patch for hfpll
- Single patch for gcc fixes
- Series for kpss-xcc
- Series for clk-krait
- Series for dts fixes?

Wonder if this kind of split can work?

> Patch 01 is only used by patch 10, they can stay close.
>
> In some of the commit messages you describe what do they do, but you
> completely omit the reason for the change, why is the change necessary.
> (Yes, I spot that because I also too often skip that).
>
> >
> > The first patch is an improvement of the clk_hw_get_parent_index. The
> > original idea of clk_hw_get_parent_index was to give a way to access the
> > parent index but for some reason the final version limited it to the
> > current index. We change it to give the current parent if is not
> > provided and to give the requested parent if provided. Any user of this
> > function is updated to follow the new implementation.
> >
> > The patch 2 and 3 are some additional fixes for gcc.
> > The first one is a fix that register the pxo and cxo fixed clock only if
> > they are not defined in DTS.
> > The patch 3 require some explaination. In short is a big HACK to prevent
> > kernel panic with this series.
> >
> > The kpss-xcc driver is a mess.
> > The Documentation declare that the clocks should be provided but for some
> > reason it was never followed.
> > In fact in the ipq8064 DTSI only the clocks for l2cc are declared but
> > for cpu0 and cpu1 the clocks are not defined.
> > The kpss-xcc driver use parent_names so the clks are ignored and never
> > used so till now it wasn't a problem (ignoring the fact that they
> > doesn't follow documentation at all)
> > On top of that, the l2cc node declare the pxo clock in a really strange
> > way. It's declared using the PXO_SRC gcc clock that is never defined in
> > the gcc ipq8064 clock table. (the correct way was to declare a fixed
> > clock in dts and reference that)
> > To prevent any kind of problem we use the patch 3 and provide the clk
> > for PXO_SRC in the gcc clock table. We manually provide the clk after
> > gcc probe.
> >
> > Patch 4 is just a minor cleanup where we use the poll macro
> >
> > Patch 5 is the actually kpss-xcc conversion to parent data
> >
> > Patch 6-7 should be a fixup of a real conver case
> >
> > Patch 8 converts the krait-cc to parent_data
> > Patch 9 give some love to the code with some minor fixup
> > Patch 10 drop the hardcoded safe sel and use the new
> > clk_hw_get_parent_index to get the safe parent index.
> > (also I discovered that the parent order was wrong)
> >
> > Patch 11 is an additional fixup to force the reset of the muxes even
> > more.
> >
> > Patch 12-13 are some additiona taken from the qsdk that were missing in
> > the upstream driver
> >
> > Patch 14 converts krait-cc to yaml
> >
> > Patch 15 add to krait-cc Documentation the L2 clocks
> >
> > Patch 16 converts the kpss-acc driver to yaml and fix some Documentation
> > error
> >
> > Patch 17 convets the kpss-gcc driver to yaml
> >
> > Patch 18 finally adds all this stuff to the ipq8064 dtsi (and fix the
> > stupid PXO_SRC phandle)
> >
> > I tested this series on a ipq8064 SoC by running a cache benchmark test
> > to make sure the changes are correct and we don't silently cause
> > regressions. Also I compared the output of the clk_summary every time
> > and we finally have a sane output where the mux are correctly placed in
> > the correct parent. (till now we had the cpu aux clock all over the
> > place, probably never cause problems but who knows.)
> >
> > v6:
> > - Move dts patch as last patch
> > - Address commencts from Rob
> > - Fix warning from make dtbs_check
> > v5:
> > - Address comments from Krzysztof
> > v4:
> > - Fix more dt-bindings bog errors
> > v3:
> > - Split Documentation files for kpss and krait-cc
> > v2:
> > - introduce new API instead of fixing the existing one
> > - do not reorganize variables in krait-cc
> > - fix some comments error and improve it
> > - return better error for patch 7
> > - fix missing new line on patch 16
> >
> > Ansuel Smith (18):
> > clk: introduce clk_hw_get_index_of_parent new API
> > clk: qcom: gcc-ipq806x: skip pxo/cxo fixed clk if already present
> > clk: qcom: gcc-ipq806x: add PXO_SRC in clk table
> > clk: qcom: clk-hfpll: use poll_timeout macro
> > clk: qcom: kpss-xcc: convert to parent data API
> > clk: qcom: clk-krait: unlock spin after mux completion
> > clk: qcom: clk-krait: add hw_parent check for div2_round_rate
> > clk: qcom: krait-cc: convert to parent_data API
> > clk: qcom: krait-cc: drop pr_info and register qsb only if needed
> > clk: qcom: krait-cc: drop hardcoded safe_sel
> > clk: qcom: krait-cc: force sec_mux to QSB
> > clk: qcom: clk-krait: add apq/ipq8064 errata workaround
> > clk: qcom: clk-krait: add enable disable ops
> > dt-bindings: clock: Convert qcom,krait-cc to yaml
> > dt-bindings: clock: Add L2 clocks to qcom,krait-cc Documentation
> > dt-bindings: arm: msm: Convert kpss-acc driver Documentation to yaml
> > dt-bindings: arm: msm: Convert kpss-gcc driver Documentation to yaml
> > ARM: dts: qcom: qcom-ipq8064: add missing krait-cc compatible and
> > clocks
> >
> > .../bindings/arm/msm/qcom,kpss-acc.txt | 49 -----
> > .../bindings/arm/msm/qcom,kpss-acc.yaml | 94 +++++++++
> > .../bindings/arm/msm/qcom,kpss-gcc.txt | 44 -----
> > .../bindings/arm/msm/qcom,kpss-gcc.yaml | 69 +++++++
> > .../bindings/clock/qcom,krait-cc.txt | 34 ----
> > .../bindings/clock/qcom,krait-cc.yaml | 65 ++++++
> > arch/arm/boot/dts/qcom-ipq8064.dtsi | 24 ++-
> > drivers/clk/clk.c | 14 ++
> > drivers/clk/qcom/clk-hfpll.c | 13 +-
> > drivers/clk/qcom/clk-krait.c | 44 ++++-
> > drivers/clk/qcom/clk-krait.h | 1 +
> > drivers/clk/qcom/gcc-ipq806x.c | 27 ++-
> > drivers/clk/qcom/kpss-xcc.c | 25 +--
> > drivers/clk/qcom/krait-cc.c | 186 ++++++++++--------
> > include/linux/clk-provider.h | 1 +
> > 15 files changed, 453 insertions(+), 237 deletions(-)
> > delete mode 100644 Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.txt
> > create mode 100644 Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.yaml
> > delete mode 100644 Documentation/devicetree/bindings/arm/msm/qcom,kpss-gcc.txt
> > create mode 100644 Documentation/devicetree/bindings/arm/msm/qcom,kpss-gcc.yaml
> > delete mode 100644 Documentation/devicetree/bindings/clock/qcom,krait-cc.txt
> > create mode 100644 Documentation/devicetree/bindings/clock/qcom,krait-cc.yaml
> >
>
>
> --
> With best wishes
> Dmitry

--
Ansuel