Re: [PATCH V5 1/1] usb:serial add Fintek F81532/534 driver

From	Johan Hovold <johan@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH V5 1/1] usb:serial add Fintek F81532/534 driver
Date	2015-10-27 15:50 +0100
Message-ID	<qodJv-6ns-1@gated-at.bofh.it> (permalink)
References	<pOv0B-2mG-15@gated-at.bofh.it> <q8C9d-7DX-33@gated-at.bofh.it> <qmdND-5kE-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

On Thu, Oct 22, 2015 at 10:25:26AM +0800, Peter Hung wrote:
> Hi Johan,
> 
> Johan Hovold 於 2015/9/14 下午 09:33 寫道:
> > On Tue, Jul 21, 2015 at 09:58:19AM +0800, Peter Hung wrote:
> 
> >>        4. RS422 Mode
> >>           1. The RTS mode is dont care.
> >>           2. Set M2/M1/M0 as 0/0/0
> >
> > I don't think all gpios should be exported for these ports if they have
> > special functions that the driver could control transparently (e.g. for
> > SER_RS485_RTS_ON_SEND).
> 
> Surely, we can hide some setting with definitely setting like
> RS232/RS485, but the settings is only apply to our evaluation board.
> 
> Some customers will use our F81532/534 with other brand transceiver IC.
> The pins setting maybe changed, so we decided to separate UART & pins
> settings and let the 3 output pins controllable for customer.
> 
> Could I preserve currently UART & pins setting mode ?

If the pins can be set independently of the mode, and in principle be
used as general purpose output-only pins, then you should use the
gpiolib interface.

However, in the last patch it did look like the gpio-implementation was
intertwined with mode selection, something which made it seem like a bad
fit.

Would you be able to separate it, and specifically, make the gpio and
mode-handling generic and not specific for your evaluation board?

Thanks,
Johan
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

Re: [PATCH V5 1/1] usb:serial add Fintek F81532/534 driver Peter Hung <hpeter@gmail.com> - 2015-10-22 04:30 +0200
  Re: [PATCH V5 1/1] usb:serial add Fintek F81532/534 driver Johan Hovold <johan@kernel.org> - 2015-10-27 15:50 +0100

csiph-web