arm64: dts: aspeed: Fix duplicate pinctrl labels and address scheme

A report from shashiko-bot highlighted some concerns concurrent to
application of the series[1].

Fix duplicate pinctrl_tach{0-15}

arm64: dts: aspeed: Fix duplicate pinctrl labels and address scheme

A report from shashiko-bot highlighted some concerns concurrent to
application of the series[1].

Fix duplicate pinctrl_tach{0-15} and pinctrl_n{cts,dcd,dsr,ri}5 labels
in aspeed-g7-soc1-pinctrl.dtsi. These didn't cause errors from dtc
because dtc accepts duplicate labels for duplicate nodes specified
through a node reference[2].

Drop the cpu-index from secondary/tertiary container nodes: reduce
the "#address-cells" from 2 to 1 and update unit-addresses and reg
accordingly. The 2-cell scheme was proposed in an early mailing list
sketch to prompt discussion[3], but the design evolved in ways that made
it unnecessary.

Also remove URL comments from the DTS. The links were to comments in
the kernel sources with discussion justifying the approach, but are not
necessary to carry forward.

[arj: Extend discussion in the commit message]

Link: https://lore.kernel.org/all/20260609025708.ADBFE1F00893@smtp.kernel.org/ [1]
Link: https://lore.kernel.org/all/b226339bb2abe42ce23e90eadbc654b426131083.camel@codeconstruct.com.au/ [2]
Link: https://lore.kernel.org/all/1a2ca78746e00c2ec4bfc2953a897c48376ed36f.camel@codeconstruct.com.au/ [3]
Suggested-by: Andrew Jeffery <andrew@codeconstruct.com.au>
Fixes: e77bb5dc5759 ("arm64: dts: aspeed: Add initial AST27xx SoC device tree")
Signed-off-by: Ryan Chen <ryan_chen@aspeedtech.com>
Link: https://patch.msgid.link/20260611-dtsi_fix-v1-1-ef2b7cd86d6d@aspeedtech.com
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>
Link: https://lore.kernel.org/r/20260612-aspeed-arm64-dt-v1-1-d1d1a4737905@codeconstruct.com.au
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

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arm64: dts: aspeed: Add initial AST27xx SoC device tree

Add initial device tree support for the ASPEED AST27xx family, the
8th-generation Baseboard Management Controller (BMC) SoCs.

AST27xx SOC Fam

arm64: dts: aspeed: Add initial AST27xx SoC device tree

Add initial device tree support for the ASPEED AST27xx family, the
8th-generation Baseboard Management Controller (BMC) SoCs.

AST27xx SOC Family
- https://www.aspeedtech.com/server_ast2700/
- https://www.aspeedtech.com/server_ast2720/
- https://www.aspeedtech.com/server_ast2750/

The AST27xx features a dual-SoC architecture consisting of two dies,
referred to as SoC0 and SoC1 - interconnected through an internal
proprietary bus. Both SoCs share the same address decoding scheme,
while each maintains independent clock and reset domains.

- SoC0 (CPU die): contains a quad-core Cortex-A35 cluster and two
Cortex-M4 cores, along with high-speed peripherals.
- SoC1 (I/O die): includes the BootMCU (responsible for system
boot) and its own clock/reset domains low-speed peripherals.

The device tree describes the SoC0 and SoC1 domains and their peripheral
layouts.

Signed-off-by: Ryan Chen <ryan_chen@aspeedtech.com>
Link: https://lore.kernel.org/r/20260609-upstream_ast2700-v9-3-f631752f0cb1@aspeedtech.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

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