ARM: make ARCH_S3C24XX select USE_OF and clean-up boot/dts/Makefile
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Message ID CAK7LNASWV7F+rjEq-RN+QGwx1fbnaL1oeWmu178A_a-Q=5f95g@mail.gmail.com
State New, archived
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Commit Message

Masahiro Yamada Dec. 24, 2017, 5:19 p.m. UTC
2017-12-22 21:41 GMT+09:00 Krzysztof Kozlowski <krzk@kernel.org>:
> On Mon, Nov 27, 2017 at 3:19 AM, Masahiro Yamada
> <yamada.masahiro@socionext.com> wrote:
>> ARCH_S3C24XX is a very exceptional platform that some DT files in
>> arch/arm/boot/dts/, but does not select USE_OF.
>
> Not entirely. The platform does select USE_OF - when MACH_S3C2416_DT
> is chosen. For other boards USE_OF is not necessary because they do
> not use DT. Why you need to select it for entire arch?
>
> Best regards,
> Krzysztof
>


The reason is simple - to avoid compile error.


If I simply drop ifeq ($(CONFIG_OF),y)
but do not select ARCH_S3C24XX,
s3c2410_defconfig failed to build.


$ make -s ARCH=arm mrproper
$ make -s ARCH=arm s3c2410_defconfig
$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf-  dtbs
    ...

  DTC     arch/arm/boot/dts/s3c2416-smdk2416.dtb
/bin/sh: 1: ./scripts/dtc/dtc: not found
scripts/Makefile.lib:310: recipe for target
'arch/arm/boot/dts/s3c2416-smdk2416.dtb' failed
make[1]: *** [arch/arm/boot/dts/s3c2416-smdk2416.dtb] Error 127
arch/arm/Makefile:349: recipe for target 'dtbs' failed
make: *** [dtbs] Error 2


Another solution would be to enable dtb by CONFIG_MACH_S3C2416_DT.





If you migrate S3C24XX platform to DT,
per-board CONFIG option will go away.

So, I think dtb-$(CONFIG_ARCH_S3C24XX) is OK.



>> All the other platforms with DT files correctly select USE_OF
>> directly or indirectly (Most of them are either ARCH_MULTIPLATFORM
>> or ARM_SINGLE_ARMV7M).
>>
>> With ARCH_S3C24XX fixed, "ifeq ($(CONFIG_OF),y)" in DT Makefile
>> can be deleted.
>>
>> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
>> ---
>>
>>  arch/arm/Kconfig           | 1 +
>>  arch/arm/boot/dts/Makefile | 3 ---
>>  2 files changed, 1 insertion(+), 3 deletions(-)
>>
>> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
>> index 51c8df5..5604497 100644
>> --- a/arch/arm/Kconfig
>> +++ b/arch/arm/Kconfig
>> @@ -595,6 +595,7 @@ config ARCH_S3C24XX
>>         select MULTI_IRQ_HANDLER
>>         select NEED_MACH_IO_H
>>         select SAMSUNG_ATAGS
>> +       select USE_OF
>>         help
>>           Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
>>           and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
>> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
>> index d0381e9..6f7f25d 100644
>> --- a/arch/arm/boot/dts/Makefile
>> +++ b/arch/arm/boot/dts/Makefile
>> @@ -1,6 +1,4 @@
>>  # SPDX-License-Identifier: GPL-2.0
>> -ifeq ($(CONFIG_OF),y)
>> -
>>  dtb-$(CONFIG_ARCH_ALPINE) += \
>>         alpine-db.dtb
>>  dtb-$(CONFIG_MACH_ARTPEC6) += \
>> @@ -1104,4 +1102,3 @@ dtb-$(CONFIG_ARCH_ZX) += zx296702-ad1.dtb
>>  dtb-$(CONFIG_ARCH_ASPEED) += aspeed-bmc-opp-palmetto.dtb \
>>         aspeed-bmc-opp-romulus.dtb \
>>         aspeed-ast2500-evb.dtb
>> -endif
>> --
>> 2.7.4
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe devicetree" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Comments

Krzysztof Kozlowski Dec. 25, 2017, 5:39 p.m. UTC | #1
On Sun, Dec 24, 2017 at 6:19 PM, Masahiro Yamada
<yamada.masahiro@socionext.com> wrote:
> 2017-12-22 21:41 GMT+09:00 Krzysztof Kozlowski <krzk@kernel.org>:
>> On Mon, Nov 27, 2017 at 3:19 AM, Masahiro Yamada
>> <yamada.masahiro@socionext.com> wrote:
>>> ARCH_S3C24XX is a very exceptional platform that some DT files in
>>> arch/arm/boot/dts/, but does not select USE_OF.
>>
>> Not entirely. The platform does select USE_OF - when MACH_S3C2416_DT
>> is chosen. For other boards USE_OF is not necessary because they do
>> not use DT. Why you need to select it for entire arch?
>>
>> Best regards,
>> Krzysztof
>>
>
>
> The reason is simple - to avoid compile error.
>
>
> If I simply drop ifeq ($(CONFIG_OF),y)
> but do not select ARCH_S3C24XX,
> s3c2410_defconfig failed to build.
>
>
> $ make -s ARCH=arm mrproper
> $ make -s ARCH=arm s3c2410_defconfig
> $ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf-  dtbs
>     ...
>
>   DTC     arch/arm/boot/dts/s3c2416-smdk2416.dtb
> /bin/sh: 1: ./scripts/dtc/dtc: not found
> scripts/Makefile.lib:310: recipe for target
> 'arch/arm/boot/dts/s3c2416-smdk2416.dtb' failed
> make[1]: *** [arch/arm/boot/dts/s3c2416-smdk2416.dtb] Error 127
> arch/arm/Makefile:349: recipe for target 'dtbs' failed
> make: *** [dtbs] Error 2
>
>
> Another solution would be to enable dtb by CONFIG_MACH_S3C2416_DT.
>
>
> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> index d0381e9..950b5dd 100644
> --- a/arch/arm/boot/dts/Makefile
> +++ b/arch/arm/boot/dts/Makefile
> @@ -800,7 +798,7 @@ dtb-$(CONFIG_ARCH_ROCKCHIP) += \
>         rk3288-veyron-pinky.dtb \
>         rk3288-veyron-speedy.dtb \
>         rk3288-vyasa.dtb
> -dtb-$(CONFIG_ARCH_S3C24XX) += \
> +dtb-$(CONFIG_MACH_S3C2416_DT) += \
>         s3c2416-smdk2416.dtb
>  dtb-$(CONFIG_ARCH_S3C64XX) += \
>         s3c6410-mini6410.dtb \
>
>
>
> If you migrate S3C24XX platform to DT,
> per-board CONFIG option will go away.
>
> So, I think dtb-$(CONFIG_ARCH_S3C24XX) is OK.

I think this second solution - using CONFIG_MACH_S3C2416_DT - makes
more sense because:
1, S3C24xx will not be converted to DT. This is a legacy platform.
2. DT version supports only part of boards and peripherals so most of
existing platforms will use non-DT boardfiles. Enabling OF on all of
them is not useful for them.
3. The same error and solution probably applies to MACH_S3C64XX.

Best regards,
Krzysztof
Masahiro Yamada Dec. 27, 2017, 2 a.m. UTC | #2
2017-12-26 2:39 GMT+09:00 Krzysztof Kozlowski <krzk@kernel.org>:
> On Sun, Dec 24, 2017 at 6:19 PM, Masahiro Yamada
> <yamada.masahiro@socionext.com> wrote:
>> 2017-12-22 21:41 GMT+09:00 Krzysztof Kozlowski <krzk@kernel.org>:
>>> On Mon, Nov 27, 2017 at 3:19 AM, Masahiro Yamada
>>> <yamada.masahiro@socionext.com> wrote:
>>>> ARCH_S3C24XX is a very exceptional platform that some DT files in
>>>> arch/arm/boot/dts/, but does not select USE_OF.
>>>
>>> Not entirely. The platform does select USE_OF - when MACH_S3C2416_DT
>>> is chosen. For other boards USE_OF is not necessary because they do
>>> not use DT. Why you need to select it for entire arch?
>>>
>>> Best regards,
>>> Krzysztof
>>>
>>
>>
>> The reason is simple - to avoid compile error.
>>
>>
>> If I simply drop ifeq ($(CONFIG_OF),y)
>> but do not select ARCH_S3C24XX,
>> s3c2410_defconfig failed to build.
>>
>>
>> $ make -s ARCH=arm mrproper
>> $ make -s ARCH=arm s3c2410_defconfig
>> $ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf-  dtbs
>>     ...
>>
>>   DTC     arch/arm/boot/dts/s3c2416-smdk2416.dtb
>> /bin/sh: 1: ./scripts/dtc/dtc: not found
>> scripts/Makefile.lib:310: recipe for target
>> 'arch/arm/boot/dts/s3c2416-smdk2416.dtb' failed
>> make[1]: *** [arch/arm/boot/dts/s3c2416-smdk2416.dtb] Error 127
>> arch/arm/Makefile:349: recipe for target 'dtbs' failed
>> make: *** [dtbs] Error 2
>>
>>
>> Another solution would be to enable dtb by CONFIG_MACH_S3C2416_DT.
>>
>>
>> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
>> index d0381e9..950b5dd 100644
>> --- a/arch/arm/boot/dts/Makefile
>> +++ b/arch/arm/boot/dts/Makefile
>> @@ -800,7 +798,7 @@ dtb-$(CONFIG_ARCH_ROCKCHIP) += \
>>         rk3288-veyron-pinky.dtb \
>>         rk3288-veyron-speedy.dtb \
>>         rk3288-vyasa.dtb
>> -dtb-$(CONFIG_ARCH_S3C24XX) += \
>> +dtb-$(CONFIG_MACH_S3C2416_DT) += \
>>         s3c2416-smdk2416.dtb
>>  dtb-$(CONFIG_ARCH_S3C64XX) += \
>>         s3c6410-mini6410.dtb \
>>
>>
>>
>> If you migrate S3C24XX platform to DT,
>> per-board CONFIG option will go away.
>>
>> So, I think dtb-$(CONFIG_ARCH_S3C24XX) is OK.
>
> I think this second solution - using CONFIG_MACH_S3C2416_DT - makes
> more sense because:
> 1, S3C24xx will not be converted to DT. This is a legacy platform.
> 2. DT version supports only part of boards and peripherals so most of
> existing platforms will use non-DT boardfiles. Enabling OF on all of
> them is not useful for them.

I do not care this much.
I leave this up to you (and ARM-SOC maintainers).


> 3. The same error and solution probably applies to MACH_S3C64XX.

Maybe no.

Looking at arch/arm/mach-s3c64xx/Kconfig,
ARCH_S3C64XX depends on ARCH_MULTI_V6.

Multiplatform selects USE_OF.




>
> Best regards,
> Krzysztof
> --
> To unsubscribe from this list: send the line "unsubscribe devicetree" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Patch
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diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index d0381e9..950b5dd 100644
--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -800,7 +798,7 @@  dtb-$(CONFIG_ARCH_ROCKCHIP) += \
        rk3288-veyron-pinky.dtb \
        rk3288-veyron-speedy.dtb \
        rk3288-vyasa.dtb
-dtb-$(CONFIG_ARCH_S3C24XX) += \
+dtb-$(CONFIG_MACH_S3C2416_DT) += \
        s3c2416-smdk2416.dtb
 dtb-$(CONFIG_ARCH_S3C64XX) += \
        s3c6410-mini6410.dtb \