# Re: \[PATCH v4 02/16\] dt-bindings: clock: at91: Split up per SoC partially

- From: Krzysztof Kozlowski \<krzk@kernel.org\>
- Date: 2026-11-06 10:57:57 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2026/11/17877484
- Thread: https://ratatoskr.run/linux-arm-kernel/2026/11/17869772/t.md

```text
On Thu, Nov 05, 2026 at 12:06:38PM +0100, Alexander Dahl wrote:
> Before adding even more new indexes creating more holes in the
> clk at91 drivers pmc_data->chws arrays, split this up.
> 
> This is a partial split up only for some of the old PMC definitions.
> 
> Binding splitup was proposed for several reasons:
> 
> 1) keep the driver code simple, readable, and efficient
> 2) avoid accidental array index duplication
> 3) avoid memory waste by creating more and more unused array members.
> 
> Old values are kept to not break dts, and to maintain dt ABI.
> 
> Link: https://lore.kernel.org/linux-devicetree/20250207-jailbird-circus-bcc04ee90e05@thorsis.com/T/#u
> Signed-off-by: Alexander Dahl <redacted>
> ---
> 
> Notes:
>     v4:
>     - "re-added" some definitions present in hardware but not used in dt
>     - reword header comment (at91 -> Microchip) for newer SoCs
>     - PMC_UTMI was renamed where appropriate according to datasheets
>     
>     v3:
>     - full splitup for all at91 family SoCs instead of just a few
>     
>     v2:
>     - new patch, not present in v1
> 
>  .../reset/atmel,at91sam9260-reset.yaml        |  3 ++-
>  .../bindings/usb/atmel,at91sam9rl-udc.yaml    |  3 ++-
>  .../dt-bindings/clock/atmel,at91rm9200-pmc.h  | 16 ++++++++++++
>  .../dt-bindings/clock/atmel,at91sam9260-pmc.h | 16 ++++++++++++
>  .../dt-bindings/clock/atmel,at91sam9g45-pmc.h | 16 ++++++++++++
>  .../dt-bindings/clock/atmel,at91sam9n12-pmc.h | 16 ++++++++++++
>  .../dt-bindings/clock/atmel,at91sam9rl-pmc.h  | 16 ++++++++++++
>  .../dt-bindings/clock/atmel,at91sam9x5-pmc.h  | 16 ++++++++++++
>  include/dt-bindings/clock/atmel,sama5d2-pmc.h | 20 ++++++++++++++
>  include/dt-bindings/clock/atmel,sama5d3-pmc.h | 16 ++++++++++++
>  include/dt-bindings/clock/atmel,sama5d4-pmc.h | 17 ++++++++++++
>  .../dt-bindings/clock/microchip,sam9x60-pmc.h | 15 +++++++++++
>  .../dt-bindings/clock/microchip,sam9x7-pmc.h  | 19 ++++++++++++++
>  .../clock/microchip,sama7d65-pmc.h            | 26 +++++++++++++++++++
>  .../dt-bindings/clock/microchip,sama7g5-pmc.h | 23 ++++++++++++++++

I miss the "split" part. You only added defines, shouldn't you remove
them from other binding?

Best regards,
Krzysztof


```