linux-kernel - [PATCH v2 0/5] reset: introduce generic reset-simple controller

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250226234234.125305-1-inochiama@gmail.com>
Date: Thu, 27 Feb 2025 07:42:28 +0800
From: Inochi Amaoto <inochiama@...il.com>
To: Philipp Zabel <p.zabel@...gutronix.de>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Chen Wang <unicorn_wang@...look.com>,
	Inochi Amaoto <inochiama@...il.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Uwe Kleine-König <u.kleine-koenig@...libre.com>,
	Guo Ren <guoren@...nel.org>
Cc: devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	sophgo@...ts.linux.dev,
	linux-riscv@...ts.infradead.org,
	Yixun Lan <dlan@...too.org>,
	Longbin Li <looong.bin@...il.com>
Subject: [PATCH v2 0/5] reset: introduce generic reset-simple controller

Many SoC have a simple reset controller with toggling bit to perform
assert/deassert. It is annoyed to add device id to the reset-simple
driver for each device when coming a new SoC.

This patch series introduce a generic binding to collect devices
match the following requirement:
- There is a single, contiguous range of 32-bit registers.
- All bits in each register directly control a reset line.
   - There are no self-deasserting resets.
   - There are no timing requirements.
   - The bits are exclusively resets, nothing else.
- All bits behave the same, so all reset bits are either
  active-high or all are active-low.
- The bits can be read back, but the read status may
  be active-low independently from the writes.

If the device follows the requirement, it can set the compatiable
and reuse the provided "reset-simple" as base compatiable without
changing the reset-simple driver with unnecessary new device id.

Add a generic reset-simple controller, and migrate the Sophgo
SG2042 reset controller as an example.

Change from v1:
- https://lore.kernel.org/all/20250213020900.745551-1-inochiama@gmail.com/
1. fix title to mark it introduce new generic device for
   reset-simple driver
2. add "active-low" property support for the generic reset-simple
   device.
3. patch 1: update the binding description to illustrate the
   suitable scenarios to use this binding.

Inochi Amaoto (5):
  dt-bindings: reset: add generic bit reset controller
  reset: simple: Add active-low property support.
  reset: simple: add support generic reset-simple device
  dt-bindings: reset: simple: migrate sophgo sg2042 reset controller
  riscv: dts: sg2042: Adapt reset generator for new binding

 .../bindings/reset/reset-simple.yaml          | 66 +++++++++++++++++++
 .../bindings/reset/sophgo,sg2042-reset.yaml   | 35 ----------
 arch/riscv/boot/dts/sophgo/sg2042.dtsi        |  3 +-
 drivers/reset/reset-simple.c                  |  7 ++
 4 files changed, 75 insertions(+), 36 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/reset/reset-simple.yaml
 delete mode 100644 Documentation/devicetree/bindings/reset/sophgo,sg2042-reset.yaml

--
2.48.1