Hello, [expanded Cc: to include William Zhang and Florian Fainelli] On Mon, Apr 11, 2022 at 12:59:39AM +0200, Aurelien Jarno wrote: > 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 v5.17 increase in size is as follows: > > bcm2711-rpi-400.dtb 26481 -> 36830 bytes > bcm2711-rpi-4-b.dtb 26537 -> 36886 bytes > bcm2711-rpi-cm4-io.dtb 26426 -> 36945 bytes > bcm2837-rpi-3-a-plus.dtb 14133 -> 19740 bytes > bcm2837-rpi-3-b.dtb 14310 -> 20006 bytes > bcm2837-rpi-3-b-plus.dtb 14670 -> 20474 bytes > bcm2837-rpi-cm3-io3.dtb 13680 -> 19266 bytes > > Signed-off-by: Aurelien Jarno <aurelien@xxxxxxxxxxx> > --- > arch/arm64/boot/dts/broadcom/Makefile | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/arch/arm64/boot/dts/broadcom/Makefile b/arch/arm64/boot/dts/broadcom/Makefile > index 5082fcd1fea5..0aa8ee2afdd5 100644 > --- a/arch/arm64/boot/dts/broadcom/Makefile > +++ b/arch/arm64/boot/dts/broadcom/Makefile > @@ -1,4 +1,15 @@ > # SPDX-License-Identifier: GPL-2.0 > + > +# Enables support for device-tree overlays > +DTC_FLAGS_bcm2711-rpi-400 := -@ > +DTC_FLAGS_bcm2711-rpi-4-b := -@ > +DTC_FLAGS_bcm2711-rpi-cm4-io := -@ > +DTC_FLAGS_bcm2837-rpi-3-a-plus := -@ > +DTC_FLAGS_bcm2837-rpi-3-b := -@ > +DTC_FLAGS_bcm2837-rpi-3-b-plus := -@ > +DTC_FLAGS_bcm2837-rpi-cm3-io3 := -@ > +DTC_FLAGS_bcm2837-rpi-zero-2-w := -@ Instead of setting these all explicitly a single DTC_FLAGS := -@ would work, too, without changing how the dts in subdirs are compiled. IMHO this would be suiteable for arch/arm64/boot/dts/broadcom. Best regards Uwe -- Pengutronix e.K. | Uwe Kleine-König | Industrial Linux Solutions | https://www.pengutronix.de/ |
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