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Re: [PATCH 3/6] regulator: lp872x: Remove warning about invalid DVS GPIO

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Le mercredi 23 décembre 2015 à 11:41 +0000, Mark Brown a écrit :
> On Wed, Dec 23, 2015 at 11:58:36AM +0100, Paul Kocialkowski wrote:
> > 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/
Wiki/tracker/forums: https://redmine.replicant.us/

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[PATCH 0/6] LG Optimus Black (P970) codename sniper support and lp872x improvements Paul Kocialkowski <contact@paulk.fr> - 2015-12-23 12:10 +0100
  [PATCH 3/6] regulator: lp872x: Remove warning about invalid DVS GPIO Paul Kocialkowski <contact@paulk.fr> - 2015-12-23 12:10 +0100
    Re: [PATCH 3/6] regulator: lp872x: Remove warning about invalid DVS  GPIO Mark Brown <broonie@kernel.org> - 2015-12-23 12:50 +0100
      Re: [PATCH 3/6] regulator: lp872x: Remove warning about invalid DVS  GPIO Paul Kocialkowski <contact@paulk.fr> - 2015-12-23 13:00 +0100
        Re: [PATCH 3/6] regulator: lp872x: Remove warning about invalid DVS  GPIO Mark Brown <broonie@kernel.org> - 2015-12-23 13:00 +0100
  [PATCH 4/6] regulator: lp872x: Add enable GPIO pin support Paul Kocialkowski <contact@paulk.fr> - 2015-12-23 12:10 +0100
    Re: [PATCH 4/6] regulator: lp872x: Add enable GPIO pin support Mark Brown <broonie@kernel.org> - 2015-12-23 13:00 +0100
      Re: [PATCH 4/6] regulator: lp872x: Add enable GPIO pin support Paul Kocialkowski <contact@paulk.fr> - 2015-12-23 14:00 +0100
      Re: [PATCH 4/6] regulator: lp872x: Add enable GPIO pin support Paul Kocialkowski <contact@paulk.fr> - 2015-12-24 19:20 +0100
        Re: [PATCH 4/6] regulator: lp872x: Add enable GPIO pin support Mark Brown <broonie@kernel.org> - 2015-12-24 20:40 +0100
          Re: [PATCH 4/6] regulator: lp872x: Add enable GPIO pin support Paul Kocialkowski <contact@paulk.fr> - 2015-12-24 21:10 +0100
      Re: [PATCH 4/6] regulator: lp872x: Add enable GPIO pin support Milo Kim <milo.kim@ti.com> - 2015-12-28 03:50 +0100
        Re: [PATCH 4/6] regulator: lp872x: Add enable GPIO pin support Paul Kocialkowski <contact@paulk.fr> - 2015-12-29 00:00 +0100
          Re: [PATCH 4/6] regulator: lp872x: Add enable GPIO pin support Milo Kim <milo.kim@ti.com> - 2015-12-29 01:50 +0100
            Re: [PATCH 4/6] regulator: lp872x: Add enable GPIO pin support Paul Kocialkowski <contact@paulk.fr> - 2015-12-29 12:20 +0100
              Re: [PATCH 4/6] regulator: lp872x: Add enable GPIO pin support Milo Kim <milo.kim@ti.com> - 2015-12-30 01:30 +0100
                Re: [PATCH 4/6] regulator: lp872x: Add enable GPIO pin support Paul Kocialkowski <contact@paulk.fr> - 2015-12-30 09:40 +0100
                Re: [PATCH 4/6] regulator: lp872x: Add enable GPIO pin support Mark Brown <broonie@kernel.org> - 2015-12-30 17:40 +0100
                Re: [PATCH 4/6] regulator: lp872x: Add enable GPIO pin support Paul Kocialkowski <contact@paulk.fr> - 2015-12-30 19:40 +0100
                Re: [PATCH 4/6] regulator: lp872x: Add enable GPIO pin support Paul Kocialkowski <contact@paulk.fr> - 2015-12-31 23:00 +0100
                Re: [PATCH 4/6] regulator: lp872x: Add enable GPIO pin support Mark Brown <broonie@kernel.org> - 2015-12-31 23:20 +0100
                Re: [PATCH 4/6] regulator: lp872x: Add enable GPIO pin support Mark Brown <broonie@kernel.org> - 2015-12-31 23:00 +0100
    Re: [PATCH 4/6] regulator: lp872x: Add enable GPIO pin support Milo Kim <milo.kim@ti.com> - 2015-12-28 03:50 +0100
    Re: [PATCH 4/6] regulator: lp872x: Add enable GPIO pin support Rob Herring <robh@kernel.org> - 2015-12-29 21:10 +0100
      Re: [PATCH 4/6] regulator: lp872x: Add enable GPIO pin support Paul Kocialkowski <contact@paulk.fr> - 2015-12-29 22:30 +0100
        Re: [PATCH 4/6] regulator: lp872x: Add enable GPIO pin support Rob Herring <robh@kernel.org> - 2015-12-29 23:00 +0100
  [PATCH 6/6] ARM: multi_v7_defconfig: Enable LP872x regulator support Paul Kocialkowski <contact@paulk.fr> - 2015-12-23 12:10 +0100
  [PATCH 2/6] regulator: lp872x: Get rid of duplicate reference to DVS GPIO Paul Kocialkowski <contact@paulk.fr> - 2015-12-23 12:10 +0100
    Applied "regulator: lp872x: Get rid of duplicate reference to DVS GPIO" to the regulator tree Mark Brown <broonie@kernel.org> - 2015-12-23 13:20 +0100
    Re: [PATCH 2/6] regulator: lp872x: Get rid of duplicate reference to  DVS GPIO Milo Kim <milo.kim@ti.com> - 2015-12-28 03:50 +0100

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