This patch series adds support for the IMX-AUD-IO daughter board[1] on
the i.MX95 19x19 EVK and i.MX952 EVK platforms.

IMX-AUD-IO is an audio I/O expansion board that can be connected to the
base board through a physically present I/O connector. Add a new
fsl,io-connector Device Tree binding to describe such connector which
acts as a nexus that exposes a constrained subset of GPIO, clock, PWM
and interrupt resources to the daughter board via fixed electrical
wiring. All actual hardware providers remain on the base board.

Also update the EVK base Device Trees to describe the connector and
required board-level resources. Add a DTS overlay to enable the
IMX-AUD-IO board.

The approach used here is inspired by the discussion[2] where a
connector is described as a nexus mapping board-level resources. One
important difference in this case is that the IMX-AUD-IO daughter board
is not a hot-pluggable device. The board is connected to the connector
before boot and remains present for the lifetime of the system. As a
result, the connector is modeled to describe fixed, boot-time hardware
wiring rather than runtime attachment or hot.

[1]https://www.nxp.com/part/IMX-AUD-IO
[2]https://lore.kernel.org/linux-devicetree/20250902105710.00512c6d@booty/

Chancel Liu (5):
  clk: Add support for clock nexus dt bindings
  dt-bindings: connector: Add fsl,io-connector binding
  arm64: dts: freescale: imx95-19x19-evk: Add IMX-AUD-IO board support
  arm64: dts: freescale: imx952-evk: Add IMX-AUD-IO board support
  arm64: dts: freescale: Add common DTS overlay for IMX-AUD-IO daughter
    board

 .../bindings/connector/fsl,io-connector.yaml  | 94 +++++++++++++++++++
 arch/arm64/boot/dts/freescale/Makefile        |  4 +
 arch/arm64/boot/dts/freescale/imx-aud-io.dtso | 58 ++++++++++++
 .../boot/dts/freescale/imx95-19x19-evk.dts    | 53 ++++++++++-
 arch/arm64/boot/dts/freescale/imx952-evk.dts  | 68 +++++++++++++-
 drivers/clk/clk.c                             |  4 +-
 6 files changed, 275 insertions(+), 6 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/connector/fsl,io-connector.yaml
 create mode 100644 arch/arm64/boot/dts/freescale/imx-aud-io.dtso

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2.50.1