[PATCH 1/1] riscv: dts: Enable device-tree overlay support for starfive devices

[Conor Dooley]

Emil, Walker,

On Tue, Jun 27, 2023 at 04:06:20PM +0800, Felix Moessbauer wrote:
> Add the '-@' DTC option for the starfive 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 starfive devices allow various modules to 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 ~20%. For example, with v6.4 increase in size is as follows:

Whatcha think?

> jh7100-beaglev-starlight.dtb 6192 -> 7339
> jh7100-starfive-visionfive-v1.dtb 6281 -> 7428
> jh7110-starfive-visionfive-2-v1.2a.dtb 11101 -> 13447
> jh7110-starfive-visionfive-2-v1.3b.dtb 11101 -> 13447
> 
> Signed-off-by: Felix Moessbauer <felix.moessbauer at siemens.com>
> ---
>  arch/riscv/boot/dts/starfive/Makefile | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/arch/riscv/boot/dts/starfive/Makefile b/arch/riscv/boot/dts/starfive/Makefile
> index 170956846d49..0141504c0f5c 100644
> --- a/arch/riscv/boot/dts/starfive/Makefile
> +++ b/arch/riscv/boot/dts/starfive/Makefile
> @@ -1,4 +1,10 @@
>  # SPDX-License-Identifier: GPL-2.0
> +# Enables support for device-tree overlays
> +DTC_FLAGS_jh7100-beaglev-starlight := -@
> +DTC_FLAGS_jh7100-starfive-visionfive-v1 := -@
> +DTC_FLAGS_jh7110-starfive-visionfive-2-v1.2a := -@
> +DTC_FLAGS_jh7110-starfive-visionfive-2-v1.3b := -@
> +
>  dtb-$(CONFIG_ARCH_STARFIVE) += jh7100-beaglev-starlight.dtb
>  dtb-$(CONFIG_ARCH_STARFIVE) += jh7100-starfive-visionfive-v1.dtb
>  
> -- 
> 2.39.2
> 
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