[PATCH v3 2/4] pwm: rockchip: Allow polarity invert on rk3288

[thierry.reding@gmail.com (Thierry Reding)]

On Wed, Aug 20, 2014 at 02:29:17PM -0500, Dmitry Torokhov wrote:
> On August 20, 2014 1:54:11 PM CDT, Doug Anderson <dianders@chromium.org> wrote:
> >On Wed, Aug 20, 2014 at 3:04 AM, Thierry Reding
> ><thierry.reding@gmail.com> wrote:
> >> On Tue, Aug 19, 2014 at 09:07:54AM -0700, Doug Anderson wrote:
> >>> The rk3288 has the ability to invert 
> >>> +     struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip);
> >>> +
> >>> +     if (!pc->data->has_invert)
> >>> +             return -ENOSYS;
> >>> +
> 
> At the kernel summit hpa also mentioned that ENOSYS should only be
> used for missing syscalls. Not sure what error code would suit better
> here though...

I'd be interested in the rationale why ENOSYS shouldn't be used within
the kernel. As long as it doesn't leak to userspace where it could
possibly confuse applications I don't see any harm in using it.

Thierry
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 819 bytes
Desc: not available
URL: <http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20140821/44ef4883/attachment.sig>