Re: [PATCH 03/21] clk: sunxi-ng: Enable DE2_CCU for Allwinner 64-bit SoCs

Chen-Yu Tsai
2018-05-14T16:43:51Z

On Mon, May 14, 2018 at 1:20 AM, Jagan Teki <jagan@amarulasolutions.com> wrote:
> On Tue, May 1, 2018 at 9:53 PM, Chen-Yu Tsai <wens@csie.org> wrote:
>> On Mon, Apr 30, 2018 at 7:40 PM, Jagan Teki <jagan@amarulasolutions.com> wrote:
>>> Allwinner 64-bit SoC like H5/A64 has DE2 CCU so enable them
>>> as default.
>>>
>>> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
>>> ---
>>> drivers/clk/sunxi-ng/Kconfig | 2 ++
>>> 1 file changed, 2 insertions(+)
>>>
>>> diff --git a/drivers/clk/sunxi-ng/Kconfig b/drivers/clk/sunxi-ng/Kconfig
>>> index 79dfd296c3d1..1fffd3bf6ff3 100644
>>> --- a/drivers/clk/sunxi-ng/Kconfig
>>> +++ b/drivers/clk/sunxi-ng/Kconfig
>>> @@ -58,6 +58,8 @@ config SUN8I_V3S_CCU
>>>
>>> config SUN8I_DE2_CCU
>>> bool "Support for the Allwinner SoCs DE2 CCU"
>>> + default ARM64 && ARCH_SUNXI
>>> + depends on (DRM_SUN4I && (ARM64 && ARCH_SUNXI)) || COMPILE_TEST
>>
>> There is no reason to depend on DRM_SUN4I. There is no compile dependency.
>
> Since this CCU is for DE2 I've make DRM_SUN4I for that matter, any problem?

Users may very well be just using simplefb, but with all the clock drivers
enabled. That is a valid, if very limited, use case. So again, you should
not limit this driver based on DRM_SUN4I. There is no compile dependency.

>
>>
>> Also, this is needed on SUN8I as well, pretty much anything with DE 2.0.
>> So you shouldn't limit it to ARM64. That pretty much breaks things for
>> people with A83T's or H3's. In fact you should enable it by default for
>> these as well.
>
> True, I've skipped SUN8I since this series for A64.

And yet you are breaking existing users, which is a big no-no.

ChenYu