Re: [PATCH] ARM: shmobile: defconfig: enable HDMI output for RCar

[Khiem Nguyen <khiem.nguyen.xt@rvc.renesas.com>]

On 10/14/2015 3:22 PM, Geert Uytterhoeven wrote:
> Hi Magnus,
>
> On Wed, Oct 14, 2015 at 10:09 AM, Magnus Damm <magnus.damm@gmail.com> wrote:
>>> Or do you mean disabling them upfront?
>>> There are some clocks that must not be disabled. Some of them are not
>>> documented.
>>
>> Disabling them upfront with sparse documentation seems fun, but also a
>> bit like asking for trouble. =)
>
> I have hackish code that does it for all boards I have, and use it actively.
>
>> So disabling clocks upfront may be a troublesome but good way to
>> trigger incorrect dependencies, and unless I'm mistaken it should give
>> the same behaviour as the updated u-boot version, right?
>
> More or less (U-Boot still keeps a few enabled for its own use, e.g. Ethernet).

AFAIK, in some recent versions of Gen2 BSP, all the devices (including 
all devices enabled by u-boot for its processing, like Ethernet, TMU, 
serial) will be turned off right before jumping to kernel start address.

> Gr{oetje,eeting}s,
>
>                          Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                  -- Linus Torvalds
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