lkml.org 
[lkml]   [2016]   [Mar]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 4/5] gpio: of: Add support to have multiple gpios in gpio-hog
On Thu, Mar 10, 2016 at 05:23:55PM +0530, Laxman Dewangan wrote:
>
> On Thursday 10 March 2016 04:46 PM, Markus Pargmann wrote:
> >On Thursday 10 March 2016 12:37:32 Laxman Dewangan wrote:
> >>On Wednesday 09 March 2016 10:47 PM, Stephen Warren wrote:
> >>>On 03/09/2016 06:20 AM, Laxman Dewangan wrote:
> >>>The problem with that is the description used when acquiring the GPIO
> >>>is just "wlan_input", "wlan_output", or "wlan_control". There's
> >>>nothing to indicate what those individual pins do (perhaps one is a
> >>>reset signal, one is a regulator enable, etc.?) By requiring separate
> >>>nodes for each GPIO, then the node name can provide a meaningful
> >>>semantic name/description for each GPIO, which provides much more
> >>>information.

I agree.

> >>On this case, we have already property "line-name" and passed the name
> >>of the gpio via this property.
> >>The property names is "line-name" which is good for one string. We can
> >>support other property "line-names" with multiple string per GPIO index.
> >>
> >>line-names = "wlan-reset", "wlan-enable";

Then what happens when someone wants to selectively disable gpio hogs?

status = "okay", "disabled", "okay";

While I often push things to fewer nodes and more compact descriptions,
I don't think that is the right direction in this case.

> >There is currently a discussion about the future bindings for subnodes in GPIO
> >controller nodes. Please have a look at these two mail threads:
> >
> > "Device tree binding documentation for gpio-switch"
> > "gpio: of: Add support to have multiple gpios in gpio-hog"
>
> Second one is this patch only. Is it by intention?
>
> The binding details about the gpio-switch and names are given by property
> "lable". I think property "label" is standard way of going forward i.e. I
> post similar patch for gpio-keys device name from DT after got review
> comment.
>
> So here, we can have the gpio names under property "label" or "labels".

label is standard. labels you just made up.

> Or am I missing anything?

The point is the more one off changes I see that are all inter-related,
the less willing I am to accept any that don't consider all the cases.
The inter-relationship here is how do we describe gpio lines that don't
otherwise have a connection to another node and how to deal with them if
that changes.

Rob

\
 
 \ /
  Last update: 2016-03-17 17:21    [W:0.064 / U:0.232 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site