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Revision bd8733738c5af6114dd15d340b3f8713e9b624c2 authored by Boris Brezillon on 08 February 2015, 18:23:42 UTC, committed by Linus Walleij on 18 March 2015, 01:01:36 UTC 
pinctrl: at91: move lock/unlock_as_irq calls into request/release
 
The gpiochip_lock_as_irq call can fail and return an error,
while the irq_startup is not expected to fail (returns an
unsigned int which is not checked by irq core code).

irq_request/release_resources functions have been created
to address this problem.

Move gpiochip_lock/unlock_as_irq calls into
irq_request/release_resources functions to prevent using a
gpio as an irq if the gpiochip_lock_as_irq call failed.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
1 parent 549e783
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Brutus 
Brutus is an evaluation platform for the SA1100 manufactured by Intel.  
For more details, see:

http://developer.intel.com

To compile for Brutus, you must issue the following commands:

	make brutus_config
	make config
	[accept all the defaults]
	make zImage

The resulting kernel will end up in linux/arch/arm/boot/zImage.  This file
must be loaded at 0xc0008000 in Brutus's memory and execution started at
0xc0008000 as well with the value of registers r0 = 0 and r1 = 16 upon
entry.

But prior to execute the kernel, a ramdisk image must also be loaded in
memory.  Use memory address 0xd8000000 for this.  Note that the file 
containing the (compressed) ramdisk image must not exceed 4 MB.

Typically, you'll need angelboot to load the kernel.
The following angelboot.opt file should be used:

----- begin angelboot.opt -----
base 0xc0008000
entry 0xc0008000
r0 0x00000000
r1 0x00000010
device /dev/ttyS0
options "9600 8N1"
baud 115200
otherfile ramdisk_img.gz
otherbase 0xd8000000
----- end angelboot.opt -----

Then load the kernel and ramdisk with:

	angelboot -f angelboot.opt zImage

The first Brutus serial port (assumed to be linked to /dev/ttyS0 on your
host PC) is used by angel to load the kernel and ramdisk image. The serial
console is provided through the second Brutus serial port. To access it,
you may use minicom configured with /dev/ttyS1, 9600 baud, 8N1, no flow
control.

Currently supported:
	- RS232 serial ports
	- audio output
	- LCD screen
	- keyboard
	
The actual Brutus support may not be complete without extra patches. 
If such patches exist, they should be found from 
ftp.netwinder.org/users/n/nico.

A full PCMCIA support is still missing, although it's possible to hack
some drivers in order to drive already inserted cards at boot time with
little modifications.

Any contribution is welcome.

Please send patches to nico@fluxnic.net

Have Fun !
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