dt-bindings: mfd: x-powers: Add AC200

The AC200 is an I2C-controlled mixed-signal companion IC containing
audio, video, RTC and Fast Ethernet PHY functions.

Describe the shared input clock, audio DAI, TV encoder display graph and
optional bandgap calibration in one parent node. The codec and TV encoder
do not need separate firmware nodes.

AC_LDOIN and TV_VCC are distinct 3.3 V supply inputs. Describe them
separately without requiring different external regulators. Require the
audio supply when the DAI is described and the video supply when the
display graph is present, while allowing PHY-only configurations.

Describe the optional shared INTB connection without an internal
interrupt domain. Cable detection status remains readable over I2C when
INTB is not connected. Include wired and unwired examples.

The Ethernet PHY is represented by a PHY package on its MDIO bus, with a
phandle back to this device for access to the package control registers.
It therefore does not require an MFD child node. The input clock must run
at 24 or 27 MHz when the Ethernet PHY is used, matching the rates encoded
by its documented clock selector.

Co-developed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20260922-submit-ac200-mfd-v13-1-8832afd2481c@gmail.com
Signed-off-by: Lee Jones <lee@kernel.org>

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