Re: [PATCH] [RFC] ARM: dts: stm32: Add DTs for STM32MP15x variants of the DH SOM and PDK2

From: Alexandre Torgue <alexandre.torgue@st.com>
To: Marek Vasut <marex@denx.de>, <linux-arm-kernel@lists.infradead.org>
Cc: Patrick Delaunay <patrick.delaunay@st.com>,
	Patrice Chotard <patrice.chotard@st.com>,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	linux-stm32@st-md-mailman.stormreply.com
Subject: Re: [PATCH] [RFC] ARM: dts: stm32: Add DTs for STM32MP15x variants of the DH SOM and PDK2
Date: Tue, 24 Mar 2020 15:28:28 +0100	[thread overview]
Message-ID: <792e11db-d345-03d4-6d8f-3f9b8ed40576@st.com> (raw)
In-Reply-To: <028556ba-f088-bf04-4473-a69569157411@denx.de>

On 3/24/20 3:15 PM, Marek Vasut wrote:
> On 3/24/20 3:07 PM, Alexandre Torgue wrote:
>>
>>
>> On 3/24/20 2:22 PM, Marek Vasut wrote:
>>> On 3/24/20 2:04 PM, Alexandre Torgue wrote:
>>>>
>>>>
>>>> On 3/23/20 3:31 AM, Marek Vasut wrote:
>>>>> The DH PDK2 can be populated with SoM with any STM32MP15x variant.
>>>>> Add the DTs describing the remaining combinations.
>>>>>
>>>>> Signed-off-by: Marek Vasut <marex@denx.de>
>>>>> Cc: Alexandre Torgue <alexandre.torgue@st.com>
>>>>> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
>>>>> Cc: Patrice Chotard <patrice.chotard@st.com>
>>>>> Cc: Patrick Delaunay <patrick.delaunay@st.com>
>>>>> Cc: linux-stm32@st-md-mailman.stormreply.com
>>>>> To: linux-arm-kernel@lists.infradead.org
>>>>> ---
>>>>> NOTE: Is there a better way to do this than to have this kind of a
>>>>>       combinatorial explosion of DTs ?
>>>>
>>>> I have no better idea. Question was the same for stm32 boards, and I
>>>> chose to take this option.
>>>
>>> One option would be to just have DT for the most feature-complete option
>>> (157) and then have U-Boot remove the nodes for HW which is not present
>>> on the particular SoC option if it's one of the more limited ones (153,
>>> 151).
>>>
>>
>> Yes it was a possibility that I discussed with kevin H. at the latest
>> ELCE but at the end the best way to follow was to enhance number of dts
>> files. The best would be to have dedicated folders but it is another story.
> 
> Or use DT overlays somehow ? U-Boot can apply DTOs onto DT before
> booting Linux.
> 
> Having tons of DTs on a system is a lot of duplication, I don't really
> like that.

I agree that to maintain it's a nightmare, but it's a way to help DT users.

> 
> But for starters, feel free to review this patch.
> 

Your patch sounds good.

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