lkml.org 
[lkml]   [2020]   [Dec]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [BUG] SPI broken for SPI based panel drivers
From
Date

> Am 01.12.2020 um 17:20 schrieb Mark Brown <broonie@kernel.org>:
>
> On Tue, Dec 01, 2020 at 03:20:12PM +0100, Linus Walleij wrote:
>
>> The reason why I shoot in the dark to convert all SPI
>> drivers to use GPIO descriptors instead of the global
>> GPIO numberspace is detailed in drivers/gpio/TODO
>> so I will not repeat it here.
>
>> I don't know if much can be done about it other than
>> having better programmers than me at the task. Or
>> less tired when they write the patch. etc.
>
> I think the problem here is more to do with where we started than where
> we're going or how we got there - things have been glued together or
> happened to work in ways that mean I'm not sure we reasonably understand
> the situation we started from or all the requirements it has. As you
> say I'm not sure anything beyond throwing the API away and starting
> afresh would really help here, but that's not really how we tend to do
> things for a bunch of very good reasons.

I think the key problem is GPIO_ACTIVE_HIGH 0 and GPIO_ACTIVE_LOW 1
in device tree blobs. But that is so fundamental that we have to live with it.
So I guess that even a new API from scratch wouldn't improve that.
\
 
 \ /
  Last update: 2020-12-01 17:47    [W:0.106 / U:0.168 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site