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arm: dts: Enable device-tree overlay support for AT91 boards 

Add the '-@' DTC option for AT91 boards that have device-tree overlays.
This option populates the '__symbols__' node that contains all the
necessary symbols for supporting device-tree overlays (from bootloader)
on these devices.

This change increases the size of the resulting DTB with ~30%-40%. Below
are the measurements performed v6.4-rc6:

at91-sam9x60_curiosity.dtb	28499 -> 36641 bytes
at91-sam9x60ek.dtb		30867 -> 39609 bytes
at91-sama5d27_som1_ek.dtb	26086 -> 34166 bytes
at91-sama5d27_wlsom1_ek.dtb	26045 -> 33184 bytes
at91-sama5d2_icp.dtb		27521 -> 36155 bytes
at91-sama5d2_ptc_ek.dtb		23237 -> 29612 bytes
at91-sama5d2_xplained.dtb	27262 -> 35326 bytes
at91-sama5d3_eds.dtb		27924 -> 39939 bytes
at91-sama5d3_xplained.dtb	28400 -> 40650 bytes
at91-sama5d4_xplained.dtb	26456 -> 36107 bytes
at91-sama7g5ek.dtb		29212 -> 37289 bytes

Signed-off-by: Cristian Birsan <cristian.birsan@microchip.com>
Link: https://lore.kernel.org/r/20230616152932.1484154-1-cristian.birsan@microchip.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Cristian Birsan 2023-06-16 18:29:32 +03:00 committed by Arnd Bergmann
parent 982e6e1966
commit 11d5441cde
No known key found for this signature in database
GPG Key ID: 60AB47FFC9095227
1 changed files with 14 additions and 0 deletions
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14
arch/arm/boot/dts/Makefile
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@ -50,9 +50,21 @@ dtb-$(CONFIG_SOC_AT91SAM9) += \
at91sam9g35ek.dtb \
at91sam9x25ek.dtb \
at91sam9x35ek.dtb
# Enables support for device-tree overlays
DTC_FLAGS_at91-sam9x60_curiosity := -@
DTC_FLAGS_at91-sam9x60ek := -@
dtb-$(CONFIG_SOC_SAM9X60) += \
at91-sam9x60_curiosity.dtb \
at91-sam9x60ek.dtb
# Enables support for device-tree overlays
DTC_FLAGS_at91-sama5d27_som1_ek := -@
DTC_FLAGS_at91-sama5d27_wlsom1_ek := -@
DTC_FLAGS_at91-sama5d2_icp := -@
DTC_FLAGS_at91-sama5d2_ptc_ek := -@
DTC_FLAGS_at91-sama5d2_xplained := -@
DTC_FLAGS_at91-sama5d3_eds := -@
DTC_FLAGS_at91-sama5d3_xplained := -@
DTC_FLAGS_at91-sama5d4_xplained := -@
dtb-$(CONFIG_SOC_SAM_V7) += \
at91-kizbox2-2.dtb \
at91-kizbox3-hs.dtb \
@ -79,6 +91,8 @@ dtb-$(CONFIG_SOC_SAM_V7) += \
at91-sama5d4_xplained.dtb \
at91-sama5d4ek.dtb \
at91-vinco.dtb
# Enables support for device-tree overlays
DTC_FLAGS_at91-sama7g5ek := -@
dtb-$(CONFIG_SOC_SAMA7G5) += \
at91-sama7g5ek.dtb
dtb-$(CONFIG_SOC_SP7021) += \