[PATCH] arm: dts: bcm: Enable device-tree overlay support for RPi devices
Origin: https://git.kernel.org/linus/
e925743edc0d86fb846d952190d005bac8a6e373
Add the '-@' DTC option for the Raspberry Pi devices. This option
populates the '__symbols__' node that contains all the necessary symbols
for supporting device-tree overlays (for instance from the firmware or
the bootloader) on these devices.
The Rasbperry Pi devices are well known for their GPIO header, that
allow various "HATs" or other modules do be connected and this enables
users to create out-of-tree device-tree overlays for these modules.
Please note that this change does increase the size of the resulting DTB
by ~40%. For example, with v6.4-rc1 increase in size is as follows:
bcm2711-rpi-400.dtb 27556 -> 38141 bytes
bcm2711-rpi-4-b.dtb 27484 -> 38069 bytes
bcm2711-rpi-cm4-io.dtb 27373 -> 38076 bytes
bcm2835-rpi-a.dtb 12879 -> 18235 bytes
bcm2835-rpi-a-plus.dtb 13015 -> 18371 bytes
bcm2835-rpi-b.dtb 12997 -> 18377 bytes
bcm2835-rpi-b-plus.dtb 13237 -> 18666 bytes
bcm2835-rpi-b-rev2.dtb 13085 -> 18514 bytes
bcm2835-rpi-cm1-io1.dtb 13109 -> 18528 bytes
bcm2835-rpi-zero.dtb 12923 -> 18311 bytes
bcm2835-rpi-zero-w.dtb 13449 -> 18889 bytes
bcm2836-rpi-2-b.dtb 14500 -> 20252 bytes
bcm2837-rpi-3-a-plus.dtb 14930 -> 20713 bytes
bcm2837-rpi-3-b.dtb 15107 -> 20979 bytes
bcm2837-rpi-3-b-plus.dtb 15463 -> 21443 bytes
bcm2837-rpi-cm3-io3.dtb 14429 -> 20098 bytes
bcm2837-rpi-zero-2-w.dtb 14781 -> 20524 bytes
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Link: https://lore.kernel.org/r/20220410225940.135744-3-aurelien@aurel32.net
[ukleinek: rebased to v6.4-rc1]
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
Gbp-Pq: Topic features/arm
Gbp-Pq: Name arm-dts-bcm-Enable-device-tree-overlay-support-for-R.patch
projects / linux.git / commit