linux-kernel - [PATCH v2 0/3] mfd: syscon: Cleanup, fix race condition and remove platform driver

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Message-Id: <20241217-syscon-fixes-v2-0-4f56d750541d@kernel.org>
Date: Tue, 17 Dec 2024 12:11:39 -0600
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Lee Jones <lee@...nel.org>, Arnd Bergmann <arnd@...db.de>, 
 Pankaj Dubey <pankaj.dubey@...sung.com>, Heiko Stuebner <heiko@...ech.de>, 
 Liviu Dudau <liviu.dudau@....com>, Sudeep Holla <sudeep.holla@....com>, 
 Lorenzo Pieralisi <lpieralisi@...nel.org>
Cc: Peter Griffin <peter.griffin@...aro.org>, 
 Will McVicker <willmcvicker@...gle.com>, 
 John Madieu <john.madieu.xa@...renesas.com>, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, 
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v2 0/3] mfd: syscon: Cleanup, fix race condition and remove
 platform driver

Questions from Krzysztof and a syscon related binding review got me 
looking at the syscon "driver". This series is the result.

This short series drops the stale platform driver part of syscon 
support, fixes a race condition in device_node_get_regmap()
which is used by all the lookup functions, and allows for registering 
nodes without "syscon" compatibles.

Compile tested only. Testing on Tensor, the one user of 
of_syscon_register_regmap(), would be helpful.

Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
---
Changes in v2:
- Fix patch 3 logic when a syscon is found in list to not return an 
  error
- Add tags
- Link to v1: https://lore.kernel.org/r/20241211-syscon-fixes-v1-0-b5ac8c219e96@kernel.org

---
Rob Herring (Arm) (3):
      mfd: syscon: Fix race in device_node_get_regmap()
      mfd: syscon: Remove the platform driver support
      mfd: syscon: Allow syscon nodes without a "syscon" compatible

 drivers/mfd/syscon.c                 | 95 ++++++------------------------------
 drivers/mfd/vexpress-sysreg.c        |  1 -
 include/linux/platform_data/syscon.h |  9 ----
 3 files changed, 15 insertions(+), 90 deletions(-)
---
base-commit: 40384c840ea1944d7c5a392e8975ed088ecf0b37
change-id: 20241211-syscon-fixes-9f35ecb9bfbe

Best regards,
-- 
Rob Herring (Arm) <robh@...nel.org>