linux-kernel - [PATCH v3 0/3] serial: 8250_of: support an optional bus clock

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Message-ID: <20250411154419.1379529-1-elder@riscstar.com>
Date: Fri, 11 Apr 2025 10:44:15 -0500
From: Alex Elder <elder@...cstar.com>
To: gregkh@...uxfoundation.org,
	jirislaby@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org
Cc: dlan@...too.org,
	benjamin.larsson@...exis.eu,
	bastien.curutchet@...tlin.com,
	andriy.shevchenko@...ux.intel.com,
	u.kleine-koenig@...libre.com,
	lkundrak@...sk,
	devicetree@...r.kernel.org,
	linux-serial@...r.kernel.org,
	spacemit@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 0/3] serial: 8250_of: support an optional bus clock

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.

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             | 13 +++++++-
 2 files changed, 41 insertions(+), 2 deletions(-)

base-commit: 0af2f6be1b4281385b618cb86ad946eded089ac8
-- 
2.45.2