Le mercredi 23 d?cembre 2015 ? 11:41 +0000, Mark Brown a ?crit :

On Wed, Dec 23, 2015 at 11:58:36AM +0100, Paul Kocialkowski wrote:

quoted

Some devices don't hook the DVS pin to a GPIO but to ground or VCC.
In those cases, it is not a problem to have no DVS GPIO.

I would expect the driver at least needs to know how the pins or
strapped, or otherwise have configuration for ignoring the input on the
pins.  This just deletes the warnings, it doesn't have any handling for
this case that I can see.

When the DVS GPIO is invalid, lp872x_init_dvs jumps to the
set_default_dvs_mode label, which instructs the chip not to use the DVS
pin at all and do it all in software instead (by clearing the
LP8720_EXT_DVS_M bit in the LP872X_GENERAL_CFG register).

That is reflected later in the code, when setting the bucks (the DVS pin
only applies to the bucks) by checking for the LP8720_EXT_DVS_M bit on
the LP872X_GENERAL_CFG register (in lp872x_select_buck_vout_addr) to
decide whether to use software or hardware DVS selection.

As far as I understood, everything goes well when the GPIO is invalid.

-- 
Paul Kocialkowski, Replicant developer

Replicant is a fully free Android distribution running on several
devices, a free software mobile operating system putting the emphasis on
freedom and privacy/security.

Website: https://www.replicant.us/
Blog: https://blog.replicant.us/
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