On 04/22/2014 02:01 PM, Tony Lindgren wrote:
* Dave Gerlach <d-gerlach@xxxxxx> [140422 11:52]:
This patch, along with patch here [1], fixes boot for am437x-gp-evm. The
bootloader configures gpio5_7 to control the DDR3 termination regulator,
the linked patch prevents that gpio bank from being reset and losing
the previously configured state, and this patch binds the gpio to a
regulator so the kernel is aware of the state of the gpio.
[1] https://www.mail-archive.com/linux-omap@xxxxxxxxxxxxxxx/msg102941.html
Setting up the GPIO regulator makes sense to me. But the hack in the
link above is potentially a nasty time bomb for anybody trying to
use GPIO bank 5 on that board.
What tests have been done that the GPIO bank behaves properly when
it's not reset?
We've been using this configuration on this board for a while without
any apparent issues. Also, am335x-evmsk already uses the same idea for
the VTT regulator on board from commit
6046adb6ad701026c10adeac8d6a4138895f12e5 [ARM: dts: am335x-evmsk: Do not
reset gpio0] and I am unaware of any issues with that either.
Regards,
Dave
Regards,
Tony
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