linux-kernel - Re: [PATCH v7 4/8] arm64: dts: imx8mp-sr-som: build dtbs with symbols for overlay support

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Message-ID: <d12da5f4-6c46-4b55-983c-67c2368b1f82@solid-run.com>
Date: Wed, 28 Jan 2026 15:00:44 +0000
From: Josua Mayer <josua@...id-run.com>
To: Frank Li <Frank.li@....com>
CC: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, Sascha
 Hauer <s.hauer@...gutronix.de>, Pengutronix Kernel Team
	<kernel@...gutronix.de>, Fabio Estevam <festevam@...il.com>, Mikhail Anikin
	<mikhail.anikin@...id-run.com>, Yazan Shhady <yazan.shhady@...id-run.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v7 4/8] arm64: dts: imx8mp-sr-som: build dtbs with symbols
 for overlay support

Hi Frank,

On 21/01/2026 22:25, Frank Li wrote:
> On Sun, Jan 18, 2026 at 02:51:41PM +0200, Josua Mayer wrote:
>> Build all dtbs based on SolidRun i.MX8MP SoM with symbols (adding -@ to
>> dtc flags) to enable support for device-tree addons.
> Do you means addon as overlay?
Yes. I am confused what should be the correct terminology, since some places
dtbo is called addon, other places overlay.
>
>> The SoM has a camera connector for basler cameras that can be enabled by
>> downstream dtbo.
> why no upstream dtbs?
No upstream driver or bindings, and generally the description will differ
between different camera modules.

My goal was to show that dtb overlays are useful on this board.

>
>> Hence by extension all boards based on this SoM should support addons.
>>
>> Signed-off-by: Josua Mayer <josua@...id-run.com>
>> ---
>>   arch/arm64/boot/dts/freescale/Makefile | 5 +++++
>>   1 file changed, 5 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
>> index f30d3fd724d0..c4c6fd6de963 100644
>> --- a/arch/arm64/boot/dts/freescale/Makefile
>> +++ b/arch/arm64/boot/dts/freescale/Makefile
>> @@ -203,6 +203,7 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mp-aristainetos3-helios-lvds.dtb
>>   dtb-$(CONFIG_ARCH_MXC) += imx8mp-aristainetos3-proton2s.dtb
>>   dtb-$(CONFIG_ARCH_MXC) += imx8mp-beacon-kit.dtb
>>   dtb-$(CONFIG_ARCH_MXC) += imx8mp-cubox-m.dtb
>> +DTC_FLAGS_imx8mp-cubox-m := -@
> should it put before dtb-$(CONFIG_ARCH_MXC) += imx8mp-cubox-m.dtb?

Checking other Makefiles flags are generally specified before the dtb.
So I will change it accordingly.

Examples:

arch/riscv/boot/dts/starfive/Makefile:DTC_FLAGS_jh7100-beaglev-starlight 
:= -@
arch/riscv/boot/dts/starfive/Makefile:DTC_FLAGS_jh7100-starfive-visionfive-v1 
:= -@
arch/riscv/boot/dts/starfive/Makefile:DTC_FLAGS_jh7110-starfive-visionfive-2-v1.2a 
:= -@
arch/riscv/boot/dts/starfive/Makefile:DTC_FLAGS_jh7110-starfive-visionfive-2-v1.3b 
:= -@
arch/riscv/boot/dts/starfive/Makefile-
arch/riscv/boot/dts/starfive/Makefile-dtb-$(CONFIG_ARCH_STARFIVE) += 
jh7100-beaglev-starlight.dtb
arch/arm64/boot/dts/freescale/Makefile:DTC_FLAGS_fsl-ls1088a-qds := 
-Wno-interrupt_map
arch/arm64/boot/dts/freescale/Makefile-dtb-$(CONFIG_ARCH_LAYERSCAPE) += 
fsl-ls1088a-qds.dtb
arch/arm64/boot/dts/renesas/Makefile:DTC_FLAGS_r8a779g3-sparrow-hawk += 
-Wno-spi_bus_bridge
arch/arm64/boot/dts/renesas/Makefile-dtb-$(CONFIG_ARCH_R8A779G0) += 
r8a779g3-sparrow-hawk.dtb

sincerely
Josua Mayer