linux-kernel - Re: [PATCH 2/2] arm64: dts: ti: iot2050: Add overlays for M.2 used by firmware

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Message-ID: <2e91fcd9-b674-4a42-93bc-40ce2cc004a1@siemens.com>
Date: Wed, 28 Aug 2024 07:39:39 +0200
From: Jan Kiszka <jan.kiszka@...mens.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
 Rob Herring <robh+dt@...nel.org>
Cc: Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>,
 Tero Kristo <kristo@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
 Bao Cheng Su <baocheng.su@...mens.com>, Hua Qian Li <huaqian.li@...mens.com>
Subject: Re: [PATCH 2/2] arm64: dts: ti: iot2050: Add overlays for M.2 used by
 firmware

On 27.08.24 19:30, Krzysztof Kozlowski wrote:
> On 27/08/2024 18:20, Jan Kiszka wrote:
>> On 27.08.24 17:33, Rob Herring wrote:
>>> On Mon, Aug 26, 2024 at 9:29 AM Jan Kiszka <jan.kiszka@...mens.com> wrote:
>>>>
>>>> From: Jan Kiszka <jan.kiszka@...mens.com>
>>>>
>>>> To allow firmware to pick up all DTs from here, move the overlays that
>>>> are normally applied during DT fixup to the kernel source as well. Hook
>>>> then into the build nevertheless to ensure that regular checks are
>>>> performed.
>>>>
>>>> Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
>>>> ---
>>>>  arch/arm64/boot/dts/ti/Makefile               |  2 +
>>>>  ...48-iot2050-advanced-m2-bkey-ekey-pcie.dtso | 27 +++++++++++
>>>>  ...-am6548-iot2050-advanced-m2-bkey-usb3.dtso | 47 +++++++++++++++++++
>>>>  3 files changed, 76 insertions(+)
>>>>  create mode 100644 arch/arm64/boot/dts/ti/k3-am6548-iot2050-advanced-m2-bkey-ekey-pcie.dtso
>>>>  create mode 100644 arch/arm64/boot/dts/ti/k3-am6548-iot2050-advanced-m2-bkey-usb3.dtso
>>>>
>>>> diff --git a/arch/arm64/boot/dts/ti/Makefile b/arch/arm64/boot/dts/ti/Makefile
>>>> index e20b27ddf901..f459af7fac0d 100644
>>>> --- a/arch/arm64/boot/dts/ti/Makefile
>>>> +++ b/arch/arm64/boot/dts/ti/Makefile
>>>> @@ -77,6 +77,8 @@ dtb-$(CONFIG_ARCH_K3) += k3-am6528-iot2050-basic.dtb
>>>>  dtb-$(CONFIG_ARCH_K3) += k3-am6528-iot2050-basic-pg2.dtb
>>>>  dtb-$(CONFIG_ARCH_K3) += k3-am6548-iot2050-advanced.dtb
>>>>  dtb-$(CONFIG_ARCH_K3) += k3-am6548-iot2050-advanced-m2.dtb
>>>> +dtb-$(CONFIG_ARCH_K3) += k3-am6548-iot2050-advanced-m2-bkey-ekey-pcie.dtbo
>>>> +dtb-$(CONFIG_ARCH_K3) += k3-am6548-iot2050-advanced-m2-bkey-usb3.dtbo
>>>
>>> You are missing applying these overlays to anything. That is a
>>> requirement for any overlay in the tree.
>>
>> You mean apply for testing purposes? How, technically?
> 
> Apply as build a target combining base DTS and overlay. See all other
> overlays for technical aspect (just do the same).
> 

OK, it's about the magic behind the -dtbs vars.

BTW, it's not "all". I would say about 10% of the overlays are "dangling".

Jan

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