Re: [PATCH 09/10] serdev: add serdev_device_set_rts

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Rob Herring, on jeu. 16 mars 2017 09:02:07 -0500, wrote:
> On Thu, Mar 16, 2017 at 4:07 AM, Samuel Thibault
> <samuel.thibault@xxxxxxxxxxxx> wrote:
> > Sebastian Reichel, on jeu. 16 mars 2017 09:02:40 +0000, wrote:
> >> +void serdev_device_set_rts(struct serdev_device *serdev, bool enable)
> >
> > Rather than defining a set_rts(enable), and then someone will want to
> > set DTR, and similarly, get_cts() + get_dsr()... Why not sticking to the
> > TTY ops, i.e. defining serdev_device_tiocmset(serdev, set, clear) and
> > serdev_device_tiocmget? That'd seem much more straightforward to me and
> > coherent with the TTY ops.
> 
> I'd prefer to keep operations as specific functions that we can make
> slightly higher level and common across drivers. For example, a "wait
> for CTS" function rather than drivers implementing their own wait
> loops.

For waiting, I completely agree, but for setting, it looks odd not to
use the tiocmset(set,clear) interface as implemented by TTY, which is as
convenient to use as set_rts(enable) while being universal.

Samuel
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