[v9,0/2] clk: ralink: make system controller a reset provider

Message

Sergio Paracuellos Feb. 10, 2022, 9:48 a.m. UTC

Hi all,

This patch series add minimal change to provide mt7621 resets properly
defining them in the 'mediatek,mt7621-sysc' node which is the system
controller of the SoC and is already providing clocks to the rest of
the world.

There is shared architecture code for all ralink platforms in 'reset.c'
file located in 'arch/mips/ralink' but the correct thing to do to align
hardware with software seems to define and add related reset code to the
already mainlined clock driver.

After this changes, we can get rid of the useless reset controller node
in the device tree and use system controller node instead where the property
'#reset-cells' has been added. Binding documentation for this nodeq has
been updated with the new property accordly.

This series also provide a bindings include header where all related
reset bits for the MT7621 SoC are defined.

Also, please take a look to this review [0] to understand better motivation
for this series.

These remaining two are expected to go through the staging tree since there
was a dts file conflict and dependencies with driver code.

Changes in v9:
 - Drop already applied patchs in staging-tree 1, 4 of previous version of the series.
 - Collect Stephen Boys Acked-by for remaining patches.
 - Collect Philipp Zabel Reviewed-by for reset changes in driver code.

Changes in v8:
 - PATCH 3/4: with .of_xlate set, the driver needs to check whether id < nr_resets
   on its own.

Changes in v7:
 - PATCH 3/4: make use of '.of_xlate' callback as per Philipp v6 review.

Changes in v6:
 - Rebased on the top of last changes of staging-testing to properly
   update dtsi file (PATCH 4/4).
 - Send a copy of this to reset provider maintainer Philipp as per Stephen's sugestion
   to get changes added through the clk tree (Philipp, thanks in advance for reviewing
   this).

Changes in v5:
 - Move platform driver init process into 'arch_initcall' to be sure the
   rest of the world can get the resets available when needed (since PCIe
   controller driver has been moved from staging into 'drivers/pci/controller'
   is probed earlier and reset was not available so it was returning 
   -EPROBE_DEFER on firt try. Moving into 'arch_initcall' avoids the 'a bit
   anoying' PCI first failed log trace.

Changes in v4:
 - I sent wrong patch 3 accidentaly so now include the good version, sorry.

Changes in v3:
 - Collect Rob's Acked-by for patches 1 and 2. 
 - Rebase on the top of staging-next since there were already many
   changes there and PATCH 4 of the series didn't apply cleanly.

Changes in v2:
 - Address review comments of Dan Carpenter [1]:
 - Avoid 'inline' in function definition.
 - Return proper error codes (-EINVAL) instead of '-1'.
 - Make use of 'devm_kzalloc' instead of 'kzalloc'.

[0]: https://patchwork.ozlabs.org/project/devicetree-bindings/patch/[e-mail]/

Best regards,
   Sergio Paracuellos

Sergio Paracuellos (2):
  dt-bindings: clock: mediatek,mt7621-sysc: add '#reset-cells' property
  clk: ralink: make system controller node a reset provider

 .../bindings/clock/mediatek,mt7621-sysc.yaml  | 12 +++
 drivers/clk/ralink/clk-mt7621.c               | 92 ++++++++++++++++++-
 2 files changed, 103 insertions(+), 1 deletion(-)