linux-kernel - Re: [PATCH 2/2] tty: add rpmsg driver

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Date:   Mon, 15 Apr 2019 21:50:54 +0800
From:   xiang xiao <xiaoxiang781216@...il.com>
To:     "Enrico Weigelt, metux IT consult" <lkml@...ux.net>
Cc:     Arnaud Pouliquen <arnaud.pouliquen@...com>,
        Fabien Dessenne <fabien.dessenne@...com>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, linux-kernel@...r.kernel.org,
        linux-remoteproc@...r.kernel.org,
        Benjamin Gaignard <benjamin.gaignard@...com>
Subject: Re: [PATCH 2/2] tty: add rpmsg driver

On Mon, Apr 15, 2019 at 9:14 PM Enrico Weigelt, metux IT consult
<lkml@...ux.net> wrote:
>
> On 12.04.19 18:00, Arnaud Pouliquen wrote:
>
> Hi folks,
>
> <snip>
>
> Haven't followed the whole thread, but I've got the impression that the
> device is emulating an uart - if that's the case wouldn't it be better
> to implement a serial driver, instead of tty directly (which IMHO should
> make it also usable for serbus-based devices) ?

It's more natural to implement rpmsg uart on top of tty core instead
of serial layer, since:
1.Serial layer model the hardware which can just send the data one by one
2.But rpmsg could send a buffer(max 512B) in one packet
On the other hand, it's very easy to support serbus by replace
tty_port_register_device_attr to tty_port_register_device_attr_serdev.

>
>
> --mtx
>
> --
> Enrico Weigelt, metux IT consult
> Free software and Linux embedded engineering
> info@...ux.net -- +49-151-27565287