Is it possible to pass extra device-tree include directory?

[Ahmad Fatoum]

Hello,

On 7/1/20 10:49 AM, Denis Osterland-Heim wrote:
> Hi,
> 
> so, when I got your point right, only the first option is acceptable.
> The other two would be too open.

Two points:

1) I don't think this is a good idea
2) If we do it though, first option is the more acceptable one to me

> 
> Regards, Denis
> 
> Am Montag, den 29.06.2020, 10:26 +0200 schrieb Ahmad Fatoum:
>> Hello,
>>
>> On 6/26/20 9:12 AM, Denis Osterland-Heim wrote:
>>> Hi Sascha,
>>>
>>> which implementation variant would you prefer?
>>>
>>> 1) target specific flags
>>> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
>>> index 9aa8be535f30..6f341a6e3e86 100644
>>> --- a/scripts/Makefile.lib
>>> +++ b/scripts/Makefile.lib
>>> @@ -164,6 +164,7 @@ dtc_cpp_flags  = -Wp,-MD,$(depfile).pre -nostdinc                        \
>>>  		 -I$(srctree)/dts/include                                \
>>>  		 -I$(srctree)/include                                    \
>>>  		 -I$(srctree)/dts/src/                                   \
>>> +		 $(DTC_CPP_FLAGS_$(basetarget).dtb)                      \
>>>  		 -undef -D__DTS__
>>>  
>>>  ifdef CONFIG_BOOTM_FITIMAGE_PUBKEY
>>>
>>> with something like this in arch/arm/dts/Makefile:
>>> DTC_CPP_FLAGS_my-board-name.dtb := -I${PTXDIST_PLATFORMCONFIGDIR}/dts
>>> lwl-dtb-$(CONFIG_MACH_MY_BOARD_NAME) += my-board-name.dtb.o
>>>
>>> So we can clearly state that the device-tree is out of barebox tree.
>>
>> Do you really want to modify your bootloader every time you touch the kernel
>> device tree? Projects I am involved in, have a local patch to dts/ that imports
>> the BSP device trees and then extends then in arch/$ARCH/dts. The dts/ device
>> trees are updated along with bootloader update, when I can retest that the
>> kernel modifications didn't break something unexpected. The kernel device tree
>> changes more often than that.
>>
>> I don't think passing arbitrary options to dtc is something we should encourage.
>>
>> Cheers
>> Ahmad
>>
>>>
>>>
>>> 2) add EXTRA_DTC_CPP_FLAGS to Makefile.lib, to pass it to make
>>>
>>>
>>> 3) add $(patsubst "%",%,$(CONFIG_DTC_CPP_FLAGS)) to Makefile.lib, and a Kconfig option
>>>
>>> diff --git a/common/Kconfig b/common/Kconfig
>>> index 02ef3631e04b..074f25aa6b7f 100644
>>> --- a/common/Kconfig
>>> +++ b/common/Kconfig
>>> @@ -1347,3 +1347,6 @@ config DDR_SPD
>>>  
>>>  config HAVE_ARCH_KASAN
>>>         bool
>>> +
>>> +config DTC_CPP_FLAGS
>>> +       string "extra dtc-cpp flags"
>>>
>>>
>>> Regards Denis
>>>
>>> Am Freitag, den 26.06.2020, 06:49 +0200 schrieb Sascha Hauer:
>>>> Hi Denis,
>>>>
>>>> On Mon, Jun 22, 2020 at 07:42:11AM +0000, Denis Osterland-Heim wrote:
>>>>> Hi,
>>>>>
>>>>> is it possible to pass extra device-tree include directory?
>>>>> For instance "${PTXDIST_PLATFORMCONFIGDIR}/dts" to have a out-of-tree dts only in one place?
>>>>
>>>> I am not aware of any possibility doing this currently.
>>>>
>>>> Regards,
>>>>  Sascha
>>>>
>>>
>>>
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>>
>>
> 
> 
> Diehl Connectivity Solutions GmbH
> Geschäftsführung: Horst Leonberger
> Sitz der Gesellschaft: Nürnberg - Registergericht: Amtsgericht
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> 
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