[PATCH v2 0/3] Add T7 PWM core clock support

The PWM controllers on the Amlogic T7 SoC have a system clock that
controls access to the controller, in addition to the two input
clocks of channels A and B.

It is currently not described in the device tree, so it is neither
referenced nor enabled by the driver.

This series adds support for it:

  - patch 1 extends the binding with a third "core" clock for
    amlogic,t7-pwm, and makes clocks/clock-names required for it;
  - patch 2 makes the driver get and enable the optional "core"
    clock, leaving other SoCs unaffected;
  - patch 3 describes the system clock (CLKID_SYS_PWM_*) in the T7
    device tree for all the PWM controllers.

`dt_binding_check DT_SCHEMA_FILES=pwm-amlogic.yaml` test is ok

  CHKDT   ./Documentation/devicetree/bindings
warning: python package 'yamllint' not installed, skipping
  STYLE   ./Documentation/devicetree/bindings
  DTEX    Documentation/devicetree/bindings/pwm/pwm-amlogic.example.dts
  DTC [C] Documentation/devicetree/bindings/pwm/pwm-amlogic.example.dtb

Signed-off-by: Ronald Claveau <redacted>
---
Changes in v2:
- PATCH 1: Permits to use "core" clock on S4 SoC and all the ones that fallback to it.
           Rename "clk_a" and "clk_b" to "channel-a" and "channel-b". Thx to Conor's feedback.
- PATCH 3: Rename channel clock-names as done on patch 1.
- Link to v1: https://lore.kernel.org/r/20260924-add-t7-sys-pwm-clk-v1-0-05b91e87f0a9@aliel.fr (local)

---
Ronald Claveau (3):
      dt-bindings: pwm: amlogic: Add core clock for T7
      pwm: meson: Add optional core clock for S4 PWM
      arm64: dts: amlogic: t7: Add core clock to PWM controller nodes

 .../devicetree/bindings/pwm/pwm-amlogic.yaml       | 33 ++++++++++++++++++++--
 arch/arm64/boot/dts/amlogic/amlogic-t7.dtsi        | 28 +++++++++++++-----
 drivers/pwm/pwm-meson.c                            |  5 ++++
 3 files changed, 57 insertions(+), 9 deletions(-)
---
base-commit: a8c591ed6b672915e0be57843f943a2a723aff40
change-id: 20260924-add-t7-sys-pwm-clk-f0eff81bee21

Best regards,
-- 
Ronald Claveau [off-list ref]