linux-kernel - [RFC PATCH 0/2] serial: Hack up 8520.c for evil device tree hookin.

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Message-Id: <1300325167-26433-1-git-send-email-ddaney@caviumnetworks.com>
Date:	Wed, 16 Mar 2011 18:26:05 -0700
From:	David Daney <ddaney@...iumnetworks.com>
To:	linux-serial@...r.kernel.org, gregkh@...e.de,
	linux-kernel@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	grant.likely@...retlab.ca
Cc:	David Daney <ddaney@...iumnetworks.com>
Subject: [RFC PATCH 0/2] serial: Hack up 8520.c for evil device tree hookin.

I wanted to get some feedback on my attempts to control my serial
device registration with device tree data.

It was suggested by Grant Likely that I could use of_serial.c for my
purposes.  However I think it is simpler to do my own registration
code, because I need to set my own device type, required port flags,
and I/O functions, instead of using general purpose ones.  Adding this
to of_serial.c would be quite ugly, so I would like to keep it with my
chip/board code.

This leads to a problem: You cannot call serial8250_register_port()
until the 8250.c driver is registered.  of_serial.c is lucky that it
comes after 8250.c in the make file so that the device initcall order
is correct.  When I put the code in my board's serial.c file, I am not
so lucky.  To get the initialization order correct, I add a notifier
chain to 8250.c

What say you all to this approach?

David Daney (2):
  serial: 8250: Add a notifier chain for driver registration.
  MIPS: Octeon: Use device tree to register serial ports.

 arch/mips/cavium-octeon/serial.c |  140 ++++++++++++++++----------------------
 drivers/tty/serial/8250.c        |   20 ++++++
 include/linux/serial_8250.h      |   21 ++++++
 3 files changed, 101 insertions(+), 80 deletions(-)

-- 
1.7.2.3

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