linux-kernel - Re: [PATCH v2 10/14] serial: pic32

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Date:	Wed, 6 Jan 2016 22:32:47 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	<Paul.Thacker@...rochip.com>
Cc:	<Joshua.Henderson@...rochip.com>, <linux-kernel@...r.kernel.org>,
	<linux-mips@...ux-mips.org>, <ralf@...ux-mips.org>,
	<Andrei.Pistirica@...rochip.com>, <gregkh@...uxfoundation.org>,
	<jslaby@...e.com>, <linux-serial@...r.kernel.org>,
	<linux-api@...r.kernel.org>
Subject: Re: [PATCH v2 10/14] serial: pic32_uart: Add PIC32 UART driver

On Wed, 6 Jan 2016 22:00:43 +0000
<Paul.Thacker@...rochip.com> wrote:

> On 01/05/2016 03:50 PM, One Thousand Gnomes wrote:
> >
> >> +#define PIC32_SDEV_NAME		"ttyS"
> >> +#define PIC32_SDEV_MAJOR	TTY_MAJOR
> >> +#define PIC32_SDEV_MINOR	64
> >
> > No. Same goes for you as every one of the forty other people a year who
> > try and claim their console is ttyS. If it's not an 8250 it isn't.
> >
> > ttyS is the 8250, use dynamic major and minor and a different name.
> 
> Ok. Is there a naming convention documented anywhere? How about ttyPIC?

We used to document it but the document was always stale. ttyPIC sounds
fine providing nobody else is using it (and I don't think they are but
grep is your friend). We enforce the rule because in the early days lots
of people re-used ttyS for their chip. Then their chip grew an external
bus or turned into a SoC and a 16x50 got added and it all broke.

ttyPIC ought to be fine because even if you get new PIC devices with a
different uart you aren't likely to have both of the PIC cores on the
same device.

Alan

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