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arm64: dts: broadcom: amend the comment about the role of BCM2712 board DTS

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Current board DTS for Raspberry Pi5 states that bcm2712-rpi-5-b.dts
should not be modified and all declarations should go in the overlay
board DTS instead (bcm2712-rpi-5-b-ovl-rp1.dts).

There's a caveat though: there's currently no infrastructure to reliably
reference nodes that have not been declared yet, as is the case when
loading those nodes from a runtime overlay. For more details about
these limitations see [1] and follow-ups.

Change the comment to make it clear which DTS file will host specific
nodes, especially the RP1 related nodes which should be customized
outside the overlay DTS.

Link
[1] - https://lore.kernel.org/all/CAMEGJJ3=W8_R0xBvm8r+Q7iExZx8xPBHEWWGAT9ngpGWDSKCaQ@mail.gmail.com/

Signed-off-by: Andrea della Porta <andrea.porta@suse.com>
Link: https://lore.kernel.org/r/47f6368a77d6bd846c02942d20c07dd48e0ae7df.1754914766.git.andrea.porta@suse.com
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
This commit is contained in:
Andrea della Porta 2025-08-11 16:12:35 +02:00 committed by Florian Fainelli
parent 2cb82bf8c1
commit 911b1a6443
1 changed files with 8 additions and 2 deletions
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10
arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts
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@ -4,8 +4,14 @@
* the RP1 driver to load the RP1 dtb overlay at runtime, while
* bcm2712-rpi-5-b.dts (this file) is the fully defined one (i.e. it
* already contains RP1 node, so no overlay is loaded nor needed).
* This file is not intended to be modified, nodes should be added
* to the included bcm2712-rpi-5-b-ovl-rp1.dts.
* This file is intended to host the override nodes for the RP1 peripherals,
* e.g. to declare the phy of the ethernet interface or the custom pin setup
* for several RP1 peripherals.
* This in turn is due to the fact that there's no current generic
* infrastructure to reference nodes (i.e. the nodes in rp1-common.dtsi) that
* are not yet defined in the DT since they are loaded at runtime via overlay.
* All other nodes that do not have anything to do with RP1 should be added
* to the included bcm2712-rpi-5-b-ovl-rp1.dts instead.
*/
/dts-v1/;