Hi,
On 21-03-15 13:02, Eric D. wrote:
Hi,
I found this reference to axp209 gpio in u-boot code
http://code.metager.de/source/xref/denx/u-boot/drivers/power/axp209.c
Could we port this code to linux kernel ?
Not really as is, we need to add a gpio-chip to the ap209 mfd driver
in the kernel which is not that hard, but looks a lot different then the
u-boot code. We know how the hardware works and what needs to be done,
it is just a matter of someone sitting down and doing the work.
Regards,
Hans
Regards,
Eric
On Saturday, March 21, 2015 at 12:42:56 PM UTC+1, Hans de Goede wrote:
Hi,
On 20-03-15 21:31, Karsten Merker wrote:
On Fri, Mar 20, 2015 at 09:19:46PM +0100, Karsten Merker wrote:
I have just tried to take a look at the LeMaker Banana Pi schematics
on lemaker.org and am a bit confused...
According to them, the OTG VBUS power supply is controlled by a SY6280
switch, whose enable pin is driven by the USB0-DRV line. This USB0-DRV
line appears to be connected to both PB9 on the SoC as well as to GPIO2
on the AXP209. Any idea why it goes to _both_ the A20 and the AXP209?
Sorry, I misread the schematics - it goes to N_VBUSEN on the AXP209,
not to GPIO2, so it is only controlled from the A20 via PB9.
Thanks for figuring this out, unfortunately vbus-det is connected to
gpio1 of the axp209, and not to PH5 as the fex file says, so we need
axp209 gpio support in the kernel before we can get otg support going
on the bananapi.
Regards,
Hans
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