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    SubjectRe: [PATCH] tty/serial: add support for Xilinx PS UART
    On Tue, Apr 19, 2011 at 04:22:00PM -0600, John Linn wrote:
    > > -----Original Message-----
    > > From: Alan Cox [mailto:alan@lxorguk.ukuu.org.uk]
    > > Sent: Tuesday, April 19, 2011 3:16 PM
    > > To: John Linn
    > > Cc: linux-kernel@vger.kernel.org; linux-serial@vger.kernel.org
    > > Subject: Re: [PATCH] tty/serial: add support for Xilinx PS UART
    > >
    > > On Tue, 19 Apr 2011 14:14:52 -0600
    > > John Linn <john.linn@xilinx.com> wrote:
    > >
    > > > The Xilinx PS Uart is used on the new ARM based SoC. This
    > > > UART is not compatible with others such that a seperate
    > > > driver is required.
    > >
    > > Joyous. I wish people would standardise.
    > >
    > > > + 213 = /dev/ttyPS0 Xilinx PS serial port 0
    > > > + 214 = /dev/ttyPS1 Xilinx PS serial port 1
    > > > + 215 = /dev/ttyPS2 Xilinx PS serial port 2
    > > > + 216 = /dev/ttyPS3 Xilinx PS serial port 3
    > >
    > > Is there a specific reason you need fixed minor numbers ? If not
    > please
    > > use a dynamic range and keep Linus happy.
    >
    > Hi Alan,
    >
    > I hope you don't mind me asking a bit more to better understand. Here's
    > my
    > concerns (maybe not valid).
    >
    > It seems like since this is a console it can get hard to debug with
    > dynamic
    > nodes for this driver.
    >
    > This driver is for an embedded device where we don't want to require
    > udev
    > or mdev to assign nodes.

    Why not use devtmpfs? There's no need to use udev or mdev at all.

    thanks,

    greg k-h


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