Add the '-@' DTC option for the Jetson TX1, Jetson Nano, Jetson TX2, Jetson TX2 NX, Jetson AGX Xavier, Jetson Xavier NX and Jetson AGX Orin platforms. This option populates the '__symbols__' node that contains all the necessary symbols for supporting device-tree overlays on these platforms. These Jetson platforms have various expansion headers, including a 40-pin GPIO header, that allow various add-on modules to be connected and this permits users to create device-tree overlays for these modules. Please note that this change does increase the size of the resulting DTB from between 30-50%. For example, with v5.17-rc1 increase in size is as follows: tegra210-p2371-2180.dtb: 79580 -> 105744 bytes tegra210-p3450-0000.dtb: 57465 -> 81357 bytes tegra186-p2771-0000.dtb: 64763 -> 99553 bytes tegra186-p3509-0000+p3636-0001.dtb: 48078 -> 62464 bytes tegra194-p2972-0000.dtb: 75303 -> 111545 bytes tegra194-p3509-0000+p3668-0000.dtb: 74762 -> 111995 bytes tegra194-p3509-0000+p3668-0001.dtb: 74578 -> 111748 bytes tegra234-p3737-0000+p3701-0000.dtb: 11229 -> 12917 bytes Signed-off-by: Jon Hunter <jonathanh@xxxxxxxxxx> --- arch/arm64/boot/dts/nvidia/Makefile | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/arm64/boot/dts/nvidia/Makefile b/arch/arm64/boot/dts/nvidia/Makefile index ea3f338fd013..bc34c9d8846a 100644 --- a/arch/arm64/boot/dts/nvidia/Makefile +++ b/arch/arm64/boot/dts/nvidia/Makefile @@ -1,4 +1,15 @@ # SPDX-License-Identifier: GPL-2.0 + +# Enables support for device-tree overlays +DTC_FLAGS_tegra210-p2371-2180 := -@ +DTC_FLAGS_tegra210-p3450-0000 := -@ +DTC_FLAGS_tegra186-p2771-0000 := -@ +DTC_FLAGS_tegra186-p3509-0000+p3636-0001 := -@ +DTC_FLAGS_tegra194-p2972-0000 := -@ +DTC_FLAGS_tegra194-p3509-0000+p3668-0000 := -@ +DTC_FLAGS_tegra194-p3509-0000+p3668-0001 := -@ +DTC_FLAGS_tegra234-p3737-0000+p3701-0000 := -@ + dtb-$(CONFIG_ARCH_TEGRA_132_SOC) += tegra132-norrin.dtb dtb-$(CONFIG_ARCH_TEGRA_210_SOC) += tegra210-p2371-0000.dtb dtb-$(CONFIG_ARCH_TEGRA_210_SOC) += tegra210-p2371-2180.dtb -- 2.25.1
