linux-kernel - [PATCH v3 0/3] Add Tenstorrent Atlantis Clock/Reset Controller

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Message-Id: <20260126-atlantis-clocks-v3-0-b016135551b7@oss.tenstorrent.com>
Date: Mon, 26 Jan 2026 15:07:13 -0600
From: Anirudh Srinivasan <asrinivasan@....tenstorrent.com>
To: Drew Fustini <dfustini@....tenstorrent.com>, 
 Joel Stanley <jms@....tenstorrent.com>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, 
 Anirudh Srinivasan <asrinivasan@....tenstorrent.com>, 
 Philipp Zabel <p.zabel@...gutronix.de>
Cc: linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org, joel@....id.au, 
 fustini@...nel.org, mpe@...nel.org, mpe@....tenstorrent.com, 
 npiggin@....tenstorrent.com, agross@...nel.org, agross@....tenstorrent.com, 
 bmasney@...hat.com
Subject: [PATCH v3 0/3] Add Tenstorrent Atlantis Clock/Reset Controller

This series adds support for a multifunctional register block
called PRCM in the Tenstorrent Atlantis SoC, whose main functionality
is to serve clocks and resets. This block is instantiated multiple
times in the SoC, with each block covering clock/resets from a
different subsystem. This series also adds a driver that covers clocks
and resets from the RCPU subsystem, which covers most low speed IO
interfaces found in the chip. The reset controller is implemented as
an auxiliary device of the clock controller and shares the same regmap
as it.

The first commit adds bindings documenting the PRCM block, along with
clock and reset indices. The second commit adds the reset controller
driver along with the auxdev definitions needed for it. The third commit
adds the clock controller driver, and the reset controller is created as
an auxdev of it.

Signed-off-by: Anirudh Srinivasan <asrinivasan@....tenstorrent.com>

---
Changes in v3:
- Fixed warnings reported by kernel test bot
- Addressed comments on reset driver bit set/unset value
- Changed auxdev macros to use inline functions
- Renamed bindings and clock driver to use block's name of "PRCM" rather
  than syscon
- Link to v2: https://lore.kernel.org/r/20260122-atlantis-clocks-v2-0-c66371639e66@oss.tenstorrent.com

Changes in v2:
- Improve the documentation about the syscon block in bindings
- Implemented all clks using custom ops
- Removed custom lock/lock handling functions for regmap
- Addressed comments on header file ordering, newlines and typos
- Removed code for mux parent setting
- Squashed down multiple commits that added reset/auxdev separately
- Link to v1: https://lore.kernel.org/r/20260115-atlantis-clocks-v1-0-7356e671f28b@oss.tenstorrent.com

---
Anirudh Srinivasan (3):
      dt-bindings: clk: tenstorrent: Add tenstorrent,atlantis-prcm
      reset: tenstorrent: Add reset controller for Atlantis
      clk: tenstorrent: Add Atlantis clock controller driver

 .../bindings/clock/tenstorrent,atlantis-prcm.yaml  |  82 ++
 MAINTAINERS                                        |   5 +
 drivers/clk/Kconfig                                |   1 +
 drivers/clk/Makefile                               |   1 +
 drivers/clk/tenstorrent/Kconfig                    |  14 +
 drivers/clk/tenstorrent/Makefile                   |   3 +
 drivers/clk/tenstorrent/atlantis-prcm.c            | 941 +++++++++++++++++++++
 drivers/reset/Kconfig                              |  11 +
 drivers/reset/Makefile                             |   1 +
 drivers/reset/reset-tenstorrent-atlantis.c         | 160 ++++
 .../dt-bindings/clock/tenstorrent,atlantis-prcm.h  | 103 +++
 include/soc/tenstorrent/atlantis-prcm.h            |  58 ++
 12 files changed, 1380 insertions(+)
---
base-commit: 9448598b22c50c8a5bb77a9103e2d49f134c9578
change-id: 20260112-atlantis-clocks-f090c190b86d

Best regards,
-- 
Anirudh Srinivasan <asrinivasan@....tenstorrent.com>