linux-kernel - [RFC PATCH v2 0/3] Add reset control for mfd syscon devices

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Date:   Fri,  9 Dec 2022 09:33:06 +0800
From:   Jeremy Kerr <jk@...econstruct.com.au>
To:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lee Jones <lee@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mark Brown <broonie@...nel.org>
Subject: [RFC PATCH v2 0/3] Add reset control for mfd syscon devices

This RFC series adds a facility for syscon devices to control a reset
line when probed; we have instances of simple register-only syscon
resources that need deassertion of a reset line for the register set to
be accessible.

Rather than requiring a specific driver to implement this, it'd be nice
to use the generic syscon device and the generic resets linkage to do
so.

Any comments/queries/etc are most welcome.

Cheers,


Jeremy
---
v2:
 * do reset control in the early of_syscon_register() path, rather than
   the platform device init, which isn't used.
 * consequently, add regmap infrastructure to attach a reset
   controller, in a similar way to attaching clocks

Jeremy Kerr (3):
  dt-bindings: mfd/syscon: Add resets property
  regmap: mmio: allow reset control in a MMIO regmap
  mfd: syscon: allow reset control for syscon devices

 .../devicetree/bindings/mfd/syscon.yaml       |  3 +++
 drivers/base/regmap/regmap-mmio.c             | 22 +++++++++++++++
 drivers/mfd/syscon.c                          | 27 ++++++++++++++-----
 include/linux/regmap.h                        |  3 +++
 4 files changed, 49 insertions(+), 6 deletions(-)

-- 
2.35.1