lkml.org 
[lkml]   [2015]   [Feb]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH 3/3] pinctrl: qcom: handle input-enable pinconf property
From
On Fri, Jan 30, 2015 at 5:20 PM, Bjorn Andersson
<bjorn.andersson@sonymobile.com> wrote:
> On Fri 30 Jan 02:27 PST 2015, Stanimir Varbanov wrote:
>
>> + case PIN_CONFIG_INPUT_ENABLE:
>> + /* Pin is output */
>> + if (arg)
>> + return -EINVAL;
>> + arg = 1;
>> + break;
>
> My idea of this function is to query if we have the specific option
> enabled, so I don't like the fact that we're returning an error here, we
> should just return 0 with arg 0 (or something like that).
>
> However, that would not give the results we expect and your patch is
> "correct".
>
> Linus, conf_items in pinconf_generic_dump_one() seems to represent
> boolean properties of the pins. Returning 0 from pin_config_*_get()
> should in my view then be treated as it not being active.
>
> Is this in line with your view and should we modify
> pinconf_generic_dump_one() to continue for these values if the getter
> returns 0?
>
> If not, at least all the bias properties here should return -EINVAL as
> well. (which I think is wrong)

Well currently the semantics are:

- ENOTSUPP = this property is not even supported
- EINVAL = this value exists but can not be determined

It has this form primarily to serve the non-boolean properties.
For example pull-up can return -EINVAL if pull-up is supported
but pull-down is currently active, so it cannot say what
resistance it is pulled up with, as it is "infinite" (NAN,
thus translated -EINVAL).

It just folds over to the boolean props doing things in the
same way to simplify things... -EINVAL just means
"false". If we should return 1/0 from boolean props we need
to handle them as a special case in the pinconf-generic.
code, by extending the struct pinconf_generic_params,
which is possible of course.

Further: as of now pinconf_generic_dump_one() doesn't print
anything for inactive pulls etc return -EINVAL, but maybe
it should? It was just handy on some system to only see
the stuff that was really active, not to get a list of stuff that
was not active as well.

Yours,
Linus Walleij


\
 
 \ /
  Last update: 2015-02-04 11:21    [W:3.611 / U:0.580 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site