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The X-Powers AC200 is a mixed-signal companion IC with a paged register
map accessed over I2C.
Enable and rate-lock the shared input clock, retain the vendor resume
path's 40 ms wait before creating the regmap and accessing registers, and
deassert the common reset. No minimum delay is documented. Set only the
deassert bit instead of forcing a reset cycle, avoiding a chip-wide reset
of unrelated function registers. Leave the common reset deasserted during
driver removal and system shutdown; function drivers own their block
resets. Supplier unbind still tears down linked consumers and releases
the provider's clock references.
Cache only the common page selector. Individual functions can reset
independently and invalidate their other registers, so leave all
functional registers volatile.
Register the audio codec and TV encoder using static MFD cells and
automatically assigned platform device IDs. Their firmware properties
belong to the parent node. Map their supply lookups to the parent with MFD
supply aliases, without assigning separate OF nodes to the cells.
When INTB is connected, pass its physical IRQ to the TV encoder cell.
Select a cell array without IRQ resources when INTB is absent. No regmap
IRQ controller or private IRQ domain is needed.
Configure the level-triggered INTB output, defaulting to level-low when
the upstream IRQ has no trigger type. Mask all sources before enabling
INTB. Function drivers request shared threaded IRQs before enabling their
own source, check and clear their own status, and mask their source before
freeing the IRQ. Disable INTB after removing the children on failure or
removal, while the regmap and clock are still available.
The Ethernet PHY is enumerated on its MDIO bus rather than as an MFD
child. It follows the x-powers,ac200 phandle and uses this regmap for
ancillary package-control access.
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>
Link: https://patch.msgid.link/20260922-submit-ac200-mfd-v13-2-8832afd2481c@gmail.com
Signed-off-by: Lee Jones <lee@kernel.org>
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