dt-bindings: mfd: aspeed,ast2x00-scu: Describe AST2700 SCU0

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AST2700 consists of two interconnected SoC instances, each with its own
System Control Unit (SCU). The SCU0 provides pin control, interrupt
controllers, clocks, resets, and address-space mappings for the
Secondary and Tertiary Service Processors (SSP and TSP).

Describe the SSP/TSP address mappings using the standard
memory-region and memory-region-names properties.

Disallow legacy child nodes that are not present on AST2700, including
p2a-control and smp-memram. The latter is unnecessary as software can
access the scratch registers via the SCU syscon.

Also allow the AST2700 SoC0 pin controller to be described as a child
node of the SCU0, and add an example illustrating the SCU0 layout,
including reserved-memory, interrupt controllers, and pinctrl.

Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Acked-by: Linus Walleij <linusw@kernel.org>
Link: https://patch.msgid.link/20260428-upstream_pinctrl-v8-2-eb8ef9ab0498@aspeedtech.com
Signed-off-by: Lee Jones <lee@kernel.org>

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Billy Tsai 2026-04-28 17:49:46 +08:00 • committed by Lee Jones

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Documentation/devicetree/bindings/mfd/aspeed,ast2x00-scu.yaml

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