linux-kernel - [PATCH v2 0/5] Add reset controllers for other TH1520 subsystems

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Message-ID: <20250915095331.53350-1-ziyao@disroot.org>
Date: Mon, 15 Sep 2025 09:53:26 +0000
From: Yao Zi <ziyao@...root.org>
To: Drew Fustini <fustini@...nel.org>,
	Guo Ren <guoren@...nel.org>,
	Fu Wei <wefu@...hat.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Alexandre Ghiti <alex@...ti.fr>,
	Michal Wilczynski <m.wilczynski@...sung.com>
Cc: linux-riscv@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Icenowy Zheng <uwu@...nowy.me>,
	Han Gao <rabenda.cn@...il.com>,
	Han Gao <gaohan@...as.ac.cn>,
	Yao Zi <ziyao@...root.org>
Subject: [PATCH v2 0/5] Add reset controllers for other TH1520 subsystems

TH1520 SoC is split into several subsystems, and each of them comes with
distinct reset controllers. We've already had the one for VO subsystem
documented as "thead,th1520-reset" and supported, and this series adds
support for others, including AO, VI, MISC, AP, DSP and VO.

For TH1520_RESET_ID_{NPU,WDT0,WDT1}, these're reset signals that have
been introduced along with support for the VO reset controller. However,
registers in control of these resets don't stay in the VO reset region,
instead they're AP-subsystem resets, thus the original ABI is
problematic. I remove them in PATCH 1 and reintroduce them in PATCH 2.

Note the reset controller for AO subsystem is marked as "reserved" in
devicetree since AON firmware may make use of it and access in Linux
side may cause races.

This series is based on next-20250912, thanks for your time and review.

Changed from v1
- Make a separate patch for the ABI-breaking change of
  TH1520_RESET_ID_{NPU,WDT0,WDT1}
- Fix the duplicated dt-binding IDs
- Sort compatibles/reset-signal definitions in alphabetical order in
  the driver
- Sort dt-binding IDs in alphabetical order by subsystem names
- Link to v1: https://lore.kernel.org/all/20250901042320.22865-1-ziyao@disroot.org/

Yao Zi (5):
  dt-bindings: reset: thead,th1520-reset: Remove non-VO-subsystem resets
  dt-bindings: reset: thead,th1520-reset: Add controllers for more
    subsys
  reset: th1520: Prepare for supporting multiple controllers
  reset: th1520: Support reset controllers in more subsystems
  riscv: dts: thead: Add reset controllers of more subsystems for TH1520

 .../bindings/reset/thead,th1520-reset.yaml    |   8 +-
 arch/riscv/boot/dts/thead/th1520.dtsi         |  37 +
 drivers/reset/reset-th1520.c                  | 835 +++++++++++++++++-
 .../dt-bindings/reset/thead,th1520-reset.h    | 219 ++++-
 4 files changed, 1083 insertions(+), 16 deletions(-)

-- 
2.50.1