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Re: [pnx833x_port]: device name prefix - ttyS or ttySA?

To: Daniel James Laird <>,
Subject: Re: [pnx833x_port]: device name prefix - ttyS or ttySA?
From: Ihar Hrachyshka <>
Date: Tue, 13 Jan 2009 20:13:10 +0200
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On Tue, Jan 13, 2009 at 7:09 PM, Daniel James Laird
<> wrote:
> I cant find the file you are talking about however

Sorry, I misspelled the file name. It's 'drivers/serial/pnx8xxx_uart.c' instead.

> I think that the major number should infact be 4 with a minor number of 
> 64,65,66 etc.  This seems to be what other devices do.  This would mean you 
> can still be ttyS... but not clash with SA1100 if that's what you mean.

You're wrong. There are lots of board specific serial drivers that
define special major-minor numbers. For example look at sc26xx,
mpc52xx_uart, bfin_5xx drivers. The problem with pnx8xxx_uart driver
is that it uses special major:minor numbers for generic ttyS* devices.

I think we need one of these changes:
1) make a special CONFIG_PNX8XXX_UART_TTYS option for switching
between ttyS*+4:64 and ttySA*+204:5 variants (see f.e. atmel_serial
driver). Of course this CONFIG_PNX8XXX_UART_TTYS option will be
disabled if CONFIG_SERIAL_8250 enabled.
2) Just stick with ttySA*+204:5 (not with ttyS*+204:5 as it's now).

Please tell me what you prefer and I'll send you a patch.

> With regards,
> Daniel Laird
> Daniel Laird, Software Engineer
> NXP Semiconductors, BU Home, BL STB
> -----Original Message-----
> From: 
> [] On Behalf Of Ihar Hrachyshka
> Sent: 2009 Jan 13 15:08
> To:
> Subject: [pnx833x_port]: device name prefix - ttyS or ttySA?
> In 'drivers/serial/pnx833x_port.c' we define the prefix for UART serial
> device as "ttyS". Anyway, we use major:minor numbers for SA1100 serial
> driver (that are 204:5). Why don't we use "ttySA" prefix then? That's
> what different embedded build systems expect for populating /dev (f.e.
> buildroot).

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