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[v4,0/3] serial: 8250_of: support an optional bus clock

Message ID 20250411203828.1491595-1-elder@riscstar.com
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Series serial: 8250_of: support an optional bus clock | expand

Message

Alex Elder April 11, 2025, 8:38 p.m. UTC 
The SpacemiT UART hardware requires a bus clock to be enabled in addition
to the primary function clock.

This series makes it possible to specify both clocks via DTS.  If a
bus clock is required, it and the primary clock are fetched by name.

This code is available here:
  https://github.com/riscstar/linux/tree/outgoing/serial-v4

Changes between v3 and v4:
  - I simplified the third patch by reusing the local variable, as
    suggested by Andy Shevchenko
  - The first two patches are identical to what was in v3

Here is version 3 of this series:
  https://lore.kernel.org/lkml/20250411154419.1379529-1-elder@riscstar.com/

Changes between v2 and v3:
  - A third patch was added to disable the bus clock on suspend and
    enable it again on resume, as requested by Yixun Lan
  - Rob's Reviewed-by tag has been added to patch 1
  - The first two patches are otherwise identical to what was in v2

Here is version 2 of this series:
  https://lore.kernel.org/lkml/20250409192213.1130181-1-elder@riscstar.com/

Changes between v1 and v2:
  - The DT binding was fixed to properly define the number of clocks and
    clock names based on the compatible string, as suggested by Rob Herring
  - Logic to look up the optional bus clock was changed as requested
    by Andy Shevchenko
  - The bus clock pointer (which was never used after it was enabled)
    was renmoved from the of_serial_info structure

Here is the first version of this series:
  https://lore.kernel.org/lkml/20250408175146.979557-1-elder@riscstar.com/

					-Alex

Alex Elder (3):
  dt-bindings: serial: 8250: support an optional second clock
  serial: 8250_of: add support for an optional bus clock
  serial: 8250_of: manage bus clock in suspend/resume

 .../devicetree/bindings/serial/8250.yaml      | 30 ++++++++++++++++++-
 drivers/tty/serial/8250/8250_of.c             | 15 +++++++++-
 2 files changed, 43 insertions(+), 2 deletions(-)


base-commit: 0af2f6be1b4281385b618cb86ad946eded089ac8