Re: [PATCH 00/13] clk: amlogic: Introduce A9 PLL and CCU driver support

[Jerome Brunet <jbrunet@baylibre.com>]

On lun. 09 févr. 2026 at 13:48, Chuan Liu via B4 Relay <devnull+chuan.liu.amlogic.com@kernel.org> wrote:

> This patch adds driver support for Phase-Locked Loop (PLL) controllers
> and Clock Control Units (CCUs) in A9 SoC family.
>
> In the A9 SoC architecture, PLLs and clock control units are implemented
> as standardized hardware instances to reduce unnecessary differentiation
> across individual units.
>
> All A9 PLLs and CCUs are exposed as device tree nodes, providing an
> accurate representation of the SoC's internal clock hardware structure.
>
> These drivers are designed for reuse in subsequent SoC generations,
> guaranteeing code inheritance and maximizing reusability.
>
> Makefile rules compile A9 PLL and CCU drivers into clk-amlogic.o (see
> drivers/clk/amlogic/Makefile), simplifying deployment and enhancing load
> efficiency (single insmod for kernel module).
>
> Since the foundational A9 DTS hasn't been upstreamed yet, I'm temporarily
> pushing the PLL/CCU DTS files to github for driver comprehension [1].
> These patches will be included in a later release after the base A9 DTS
> is merged.

Creating a new vendor directory and re-inventing supported driver
without an explanation, coding style, build problems ... the list goes
on. You've outdone yourself !

So NACK.

Chuan has been warned numerous times about his submission to the kernel
mailing lists, without a noticeable effect. I can only suggest other
reviewers do not waste their time reviewing this.

>
> [1] https://github.com/torvalds/linux/commit/d6a82e4cce675fa5146c5f638c2a926c1c8cb1d9
>
> Signed-off-by: Chuan Liu <chuan.liu@amlogic.com>
> ---
> Chuan Liu (13):
>       dt-bindings: clock: Add Amlogic A9 standardized model clock control units
>       dt-bindings: clock: Add Amlogic A9 PLL controllers
>       dt-bindings: clock: Add Amlogic A9 misc clock control units
>       clk: amlogic: Add basic clock driver
>       clk: amlogic: Add composite clock driver
>       clk: amlogic: Add noglitch clock driver
>       clk: amlogic: Add duandiv clock driver
>       clk: amlogic: Add PLL driver
>       clk: amlogic: Add DT-based clock registration functions
>       clk: amlogic: Add A9 standardized model clock control units driver
>       clk: amlogic: Add A9 PLL controllers driver
>       clk: amlogic: Add A9 misc clock control units driver
>       clk: amlogic: Add support for building as combined kernel module
>
>  .../bindings/clock/amlogic,a9-misc-ccu.yaml        | 523 +++++++++++
>  .../bindings/clock/amlogic,a9-model-ccu.yaml       | 435 +++++++++
>  .../devicetree/bindings/clock/amlogic,a9-pll.yaml  | 134 +++
>  drivers/clk/Kconfig                                |   1 +
>  drivers/clk/Makefile                               |   1 +
>  drivers/clk/amlogic/Kconfig                        |  52 ++
>  drivers/clk/amlogic/Makefile                       |  23 +
>  drivers/clk/amlogic/a9-misc-ccu.c                  | 970 +++++++++++++++++++++
>  drivers/clk/amlogic/a9-model-ccu.c                 | 475 ++++++++++
>  drivers/clk/amlogic/a9-pll.c                       | 156 ++++
>  drivers/clk/amlogic/clk-basic.c                    | 219 +++++
>  drivers/clk/amlogic/clk-basic.h                    |  39 +
>  drivers/clk/amlogic/clk-composite.c                | 280 ++++++
>  drivers/clk/amlogic/clk-composite.h                |  20 +
>  drivers/clk/amlogic/clk-dualdiv.c                  | 365 ++++++++
>  drivers/clk/amlogic/clk-dualdiv.h                  |  27 +
>  drivers/clk/amlogic/clk-module.c                   |  42 +
>  drivers/clk/amlogic/clk-module.h                   |  53 ++
>  drivers/clk/amlogic/clk-noglitch.c                 | 584 +++++++++++++
>  drivers/clk/amlogic/clk-noglitch.h                 |  29 +
>  drivers/clk/amlogic/clk-pll.c                      | 701 +++++++++++++++
>  drivers/clk/amlogic/clk-pll.h                      |  43 +
>  drivers/clk/amlogic/clk.c                          | 464 ++++++++++
>  drivers/clk/amlogic/clk.h                          |  56 ++
>  include/dt-bindings/clock/amlogic,a9-misc-ccu.h    |  53 ++
>  25 files changed, 5745 insertions(+)
> ---
> base-commit: 4d310797262f0ddf129e76c2aad2b950adaf1fda
> change-id: 20260130-a9_clock_driver-ddd90357848c
>
> Best regards,

-- 
Jerome

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