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

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Message-ID: <6f2b38f8-1962-46f2-a095-b1eaf99ed407@kernel.org>
Date:   Thu, 21 Sep 2023 14:37:29 +0300
From:   Roger Quadros <rogerq@...nel.org>
To:     Andrew Davis <afd@...com>, Nishanth Menon <nm@...com>
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,
        Siddharth Vadapalli <s-vadapalli@...com>
Subject: Re: [PATCH 2/2] arm64: dts: ti: am642-evm: Add overlay for NAND
 expansion card

On 20/09/2023 20:06, Andrew Davis wrote:
> 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.
> 

Is this OK?

	k3-am642-evm-nand-dtbs := k3-am642-evm.dtb k3-am642-evm-nand.dtbo
	dtb-$(CONFIG_ARCH_K3) += k3-am642-evm-nand.dtb

So patch 1 is not required in this case but we have an
extra dtb file which is not really required.

I have 2 more issues to point out

1)
With existing examples e.g. J7200 EVM
wouldn't  k3-j7200-evm.dtb include the k3-j7200-evm-quad-port-eth-exp.dtbo?
Is this what we really want?

likewise for k3-j721e-evm.dtb and k3-am654-gp-evm.dtb

2)
Another issue (unrelated to this change) is the below warning:

	arch/arm64/boot/dts/ti/k3-am642-evm-nand.dtso:65.8-140.3: Warning (avoid_default_addr_size): /fragment@..._overlay__: Relying on default #address-cells value
	arch/arm64/boot/dts/ti/k3-am642-evm-nand.dtso:65.8-140.3: Warning (avoid_default_addr_size): /fragment@..._overlay__: Relying on default #size-cells value

This is because we use the 'ranges' property in the gpmc0 node
and the compiler doesn't know the #address/size-cells of the
parent node.

Is there a trick to specify it in the dtso file?

-- 
cheers,
-roger