linux-kernel - Re: [PATCH 2/2] arm64: dts: ti: am642-evm: Add overlay for NAND expansion card

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Message-ID: <c7ec6ccd-37de-244d-0b3b-cb5d13bae539@ti.com>
Date:   Wed, 20 Sep 2023 12:06:32 -0500
From:   Andrew Davis <afd@...com>
To:     Nishanth Menon <nm@...com>, Roger Quadros <rogerq@...nel.org>
CC:     <vigneshr@...com>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <srk@...com>, <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] arm64: dts: ti: am642-evm: Add overlay for NAND
 expansion card

On 9/20/23 11:44 AM, Nishanth Menon wrote:
> On 18:18-20230920, Roger Quadros wrote:
>>
>>
>> On 20/09/2023 16:58, Nishanth Menon wrote:
>>> On 16:34-20230920, Roger Quadros wrote:
>>>> The NAND expansion card plugs in over the HSE (High Speed Expansion)
>>>> connector. Add support for it.
>>>>
>>>> Signed-off-by: Roger Quadros <rogerq@...nel.org>
>>>> ---
>>>>   arch/arm64/boot/dts/ti/Makefile               |   1 +
>>>>   arch/arm64/boot/dts/ti/k3-am642-evm-nand.dtso | 140 ++++++++++++++++++
>>>>   2 files changed, 141 insertions(+)
>>>>   create mode 100644 arch/arm64/boot/dts/ti/k3-am642-evm-nand.dtso
>>>>
>>>> diff --git a/arch/arm64/boot/dts/ti/Makefile b/arch/arm64/boot/dts/ti/Makefile
>>>> index 06d6f264f292..ece74085a6be 100644
>>>> --- a/arch/arm64/boot/dts/ti/Makefile
>>>> +++ b/arch/arm64/boot/dts/ti/Makefile
>>>> @@ -29,6 +29,7 @@ dtb-$(CONFIG_ARCH_K3) += k3-am62p5-sk.dtb
>>>>   
>>>>   # Boards with AM64x SoC
>>>>   dtb-$(CONFIG_ARCH_K3) += k3-am642-evm.dtb
>>>> +dtb-$(CONFIG_ARCH_K3) += k3-am642-evm-nand.dtbo
>>>>   dtb-$(CONFIG_ARCH_K3) += k3-am642-phyboard-electra-rdk.dtb
>>>>   dtb-$(CONFIG_ARCH_K3) += k3-am642-sk.dtb
>>>>   dtb-$(CONFIG_ARCH_K3) += k3-am642-tqma64xxl-mbax4xxl.dtb
>>>
>>> Also see https://lore.kernel.org/all/20230911165610.GA1362932-robh@kernel.org/
>>>
>>> you may not get the dtbo installed when doing make dtbs_install
>>>
>>> [...]
>>>
>>
>> $ v8make dtbs_install INSTALL_DTBS_PATH=/tmp
>>    INSTALL /tmp/ti/k3-am625-beagleplay.dtb
>>    INSTALL /tmp/ti/k3-am625-phyboard-lyra-rdk.dtb
>>    INSTALL /tmp/ti/k3-am625-sk.dtb
>>    INSTALL /tmp/ti/k3-am625-verdin-nonwifi-dahlia.dtb
>>    INSTALL /tmp/ti/k3-am625-verdin-nonwifi-dev.dtb
>>    INSTALL /tmp/ti/k3-am625-verdin-nonwifi-yavia.dtb
>>    INSTALL /tmp/ti/k3-am625-verdin-wifi-dahlia.dtb
>>    INSTALL /tmp/ti/k3-am625-verdin-wifi-dev.dtb
>>    INSTALL /tmp/ti/k3-am625-verdin-wifi-yavia.dtb
>>    INSTALL /tmp/ti/k3-am62-lp-sk.dtb
>>    INSTALL /tmp/ti/k3-am62x-sk-hdmi-audio.dtbo
>>    INSTALL /tmp/ti/k3-am62a7-sk.dtb
>>    INSTALL /tmp/ti/k3-am62p5-sk.dtb
>>    INSTALL /tmp/ti/k3-am642-evm.dtb
>>    INSTALL /tmp/ti/k3-am642-evm-nand.dtbo
>> ^^^^
>>    INSTALL /tmp/ti/k3-am642-phyboard-electra-rdk.dtb
>>    INSTALL /tmp/ti/k3-am642-sk.dtb
>>
>>
>> What did I miss?
> 
> I missed it, actually. See Rob's comment:
> https://lore.kernel.org/all/CAL_Jsq+GR3hP6hFvFn2z5aXvSXnh9butD3aKZ-y_XJgx0_YPTw@mail.gmail.com/
> 
> Having orphan dtbo is apparently frowned upon
> 

And if you apply these overlays to the base DTB then it gets
symbols added automatically, no need for your patch [1/2] here.

Andrew