Daniel Vetter 371cadd8c4 drm/doc: Document ioctl errno value patterns
We're not super-consistent about these, but I think it's worth to
document at least the commmon patterns.

v2:
- Add a not about ENOTTY (it's just a confusing name, but used
exactly what it's meant for in DRM) (Chris).
- Unconfuse the text for ENODEV (Daniel)
- Move text undert the IOCTL heading (Chris).
- typos

Cc: Daniel Stone <daniel@fooishbar.org>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: "Zhang, Tina" <tina.zhang@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170818174328.6386-1-daniel.vetter@ffwll.ch
2017-08-23 15:09:26 +02:00
..
2017-06-20 10:26:01 +02:00
2017-07-26 13:22:44 +02:00
2017-06-20 11:07:03 +10:00
2017-05-05 11:48:17 +10:00
2017-06-15 13:58:56 +02:00
2017-02-18 18:04:59 +01:00