linux-kernel - [PATCH v3 0/9] clk: bcm: kona: Add bus clock support, bus clocks for BCM21664/BCM281xx

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Message-Id: <20250308-kona-bus-clock-v3-0-d6fb5bfc3b67@gmail.com>
Date: Sat, 08 Mar 2025 08:50:38 +0100
From: Artur Weber <aweber.kernel@...il.com>
To: Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, 
 Florian Fainelli <florian.fainelli@...adcom.com>, 
 Ray Jui <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>, 
 Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: Alex Elder <elder@...nel.org>, 
 Stanislav Jakubek <stano.jakubek@...il.com>, linux-clk@...r.kernel.org, 
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
 ~postmarketos/upstreaming@...ts.sr.ht, 
 Artur Weber <aweber.kernel@...il.com>, Alex Elder <elder@...cstar.com>
Subject: [PATCH v3 0/9] clk: bcm: kona: Add bus clock support, bus clocks
 for BCM21664/BCM281xx

This patchset does the following:

- Introduce support for bus clocks. These are fairly similar to
  peripheral clocks, but only implement policy, gate and hyst.

- Add matching bus clocks for BCM21664 and BCM281xx peripheral clocks
  and update device tree bindings to match.

The previous (RFC) version of this patchset also introduced a
prerequisite clock mechanism to enable bus clocks before their
corresponding peripheral clocks. It seems that this is unnecessary - 
the way these clocks are initialized leaves them enabled by default.
Thus, the prerequisite mechanism has been dropped from this version.

This is fine for now, and more accurate to hardware (bus clocks are
a prerequisite for the bus, not the peripheral clock). I had an idea
to connect bus clocks to buses using "simple-pm-bus" in DT, but
this is a task for another patchset.

Signed-off-by: Artur Weber <aweber.kernel@...il.com>
---
Changes in v3:
- Fix DT schema example in BCM281xx bus clock bindings
- Move CLOCK_COUNT defines from dt-bindings header to the driver
- Fix BCM21664 UARTBx_APB IDs being out of order compared to clock
  driver
- Link to v2: https://lore.kernel.org/r/20250303-kona-bus-clock-v2-0-a363c6a6b798@gmail.com

Changes in v2:
- Drop prerequisite clock patch
- Move clock/bcm21664.h dt-bindings header change to dt-bindings patch
- Add BCM281xx bus clocks
- Link to v1: https://lore.kernel.org/r/20250216-kona-bus-clock-v1-0-e8779d77a6f2@gmail.com

---
Artur Weber (9):
      clk: bcm: kona: Move CLOCK_COUNT defines into the driver
      dt-bindings: clock: brcm,kona-ccu: Drop CLOCK_COUNT defines from DT headers
      dt-bindings: clock: brcm,kona-ccu: Add BCM21664 bus clocks
      dt-bindings: clock: brcm,kona-ccu: Add BCM281xx bus clocks
      clk: bcm: kona: Add support for bus clocks
      clk: bcm21664: Add matching bus clocks for peripheral clocks
      clk: bcm281xx: Add corresponding bus clocks for peripheral clocks
      ARM: dts: bcm2166x-common: Add matching bus clocks for peripheral clocks
      ARM: dts: bcm11351: Add corresponding bus clocks for peripheral clocks

 .../devicetree/bindings/clock/brcm,kona-ccu.yaml   |  49 +++++++-
 arch/arm/boot/dts/broadcom/bcm11351.dtsi           |  33 ++++--
 arch/arm/boot/dts/broadcom/bcm2166x-common.dtsi    |  28 +++--
 drivers/clk/bcm/clk-bcm21664.c                     |  91 ++++++++++++++
 drivers/clk/bcm/clk-bcm281xx.c                     | 131 +++++++++++++++++++++
 drivers/clk/bcm/clk-kona-setup.c                   | 116 ++++++++++++++++++
 drivers/clk/bcm/clk-kona.c                         |  62 +++++++++-
 drivers/clk/bcm/clk-kona.h                         |  10 ++
 include/dt-bindings/clock/bcm21664.h               |  17 ++-
 include/dt-bindings/clock/bcm281xx.h               |  24 +++-
 10 files changed, 528 insertions(+), 33 deletions(-)
---
base-commit: ffd294d346d185b70e28b1a28abe367bbfe53c04
change-id: 20250212-kona-bus-clock-4297eefae940

Best regards,
-- 
Artur Weber <aweber.kernel@...il.com>