lkml.org 
[lkml]   [2020]   [Jan]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH v3 3/6] dt-bindings: mfd: da9062: add regulator voltage selection documentation
    On 20-01-07 13:09, Mark Brown wrote:
    > On Tue, Jan 07, 2020 at 09:36:54AM +0100, Marco Felsch wrote:
    > > On 19-12-17 12:58, Mark Brown wrote:
    >
    > > > This doesn't say anything about how the GPIO input is expected to be
    > > > controlled, for voltage setting any runtime control would need to be
    > > > done by the driver and it sounds like that's all that can be controlled.
    > > > The way this reads I'd expect one use of this to be for fast voltage
    > > > setting for example (you could even combine that with suspend sequencing
    > > > using the internal sequencer if you mux back to the sequencer during
    > > > suspend).
    >
    > > The input signal is routed trough the da9062 gpio block to the
    > > regualtors. You can't set any voltage value using a gpio instead you
    > > decide which voltage setting is applied. The voltage values for
    > > runtime/suspend comes from the dt-data. No it's not just a fast
    > > switching option imagine the system suspend case where the cpu and soc
    > > voltage can be reduced to a very low value. Older soc's like the imx6
    > > signaling this state by a hard wired gpio line because the soc and
    > > cpu cores don't work properly on such low voltage values. This is
    > > my use case and I can't use the sequencer.
    >
    > My point is that I can't tell any of this from the description.

    Therefore I want to discuss the dt-binding documentation with you and
    the others to get this done. Is the above description better to
    understand the dt-binding?

    Regards,
    Marco

    \
     
     \ /
      Last update: 2020-01-07 14:39    [W:5.508 / U:0.560 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site