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David Brownell 28735a7253 [PATCH] gpio_direction_output() needs an initial value 
It's been pointed out that output GPIOs should have an initial value, to
avoid signal glitching ...  among other things, it can be some time before
a driver is ready.  This patch corrects that oversight, fixing

 - documentation
 - platforms supporting the GPIO interface
 - users of that call (just one for now, others are pending)

There's only one user of this call for now since most platforms are still
using non-generic GPIO setup code, which in most cases already couples the
initial value with its "set output mode" request.

Note that most platforms are clear about the hardware letting the output
value be set before the pin direction is changed, but the s3c241x docs are
vague on that topic ...  so those chips might not avoid the glitches.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Andrew Victor <andrew@sanpeople.com>
Acked-by: Milan Svoboda <msvoboda@ra.rockwell.com>
Acked-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-03-16 19:25:04 -07:00
..
arch-at32ap [PATCH] gpio_direction_output() needs an initial value 2007-03-16 19:25:04 -07:00
mach [PATCH] atmel_serial: Rename at91_register_uart_fns 2006-10-04 10:25:05 -07:00
a.out.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
addrspace.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
asm.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
atomic.h [PATCH] AVR32: Fix oversize immediates in atomic.h 2006-10-25 20:26:33 -07:00
auxvec.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
bitops.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
bug.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
bugs.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
byteorder.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
cache.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
cachectl.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
cacheflush.h [PATCH] Optimize D-cache alias handling on fork 2006-12-13 09:27:08 -08:00
checksum.h Remove a couple final references to obsolete verify_area(). 2007-02-09 15:01:56 +01:00
cputime.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
current.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
delay.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
device.h Driver core: add dev_archdata to struct device 2006-12-01 14:52:01 -08:00
div64.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
dma-mapping.h avr32: dma-mapping.h 2007-03-07 10:50:30 +01:00
dma.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
elf.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
emergency-restart.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
errno.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
fcntl.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
futex.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
gpio.h [AVR32] GPIO API implementation 2007-02-09 15:01:58 +01:00
hardirq.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
hw_irq.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
intc.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
io.h [AVR32] Define ioremap_nocache, ioport_map and ioport_unmap 2007-02-16 12:53:57 +01:00
ioctl.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
ioctls.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
ipcbuf.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
irq.h [AVR32] GPIO API implementation 2007-02-09 15:01:58 +01:00
irq_regs.h [PATCH] IRQ: Fix AVR32 breakage 2006-10-11 11:14:14 -07:00
irqflags.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
Kbuild [AVR32] Fix typo in include/asm-avr32/Kbuild 2007-03-07 10:50:27 +01:00
kdebug.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
kmap_types.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
kprobes.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
linkage.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
local.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
mman.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
mmu.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
mmu_context.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
module.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
msgbuf.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
mutex.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
namei.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
numnodes.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
ocd.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
page.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
param.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
pci.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
percpu.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
pgalloc.h [PATCH] getting rid of all casts of k[cmz]alloc() calls 2006-12-13 09:05:58 -08:00
pgtable-2level.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
pgtable.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
poll.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
posix_types.h [AVR32] ssize_t should be long, not int 2007-02-09 15:01:59 +01:00
processor.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
ptrace.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
resource.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
scatterlist.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
sections.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
semaphore.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
sembuf.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
setup.h [PATCH] cleanup asm/setup.h userspace visibility 2006-12-07 08:39:46 -08:00
shmbuf.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
shmparam.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
sigcontext.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
siginfo.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
signal.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
socket.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
sockios.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
stat.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
statfs.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
string.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
sysreg.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
system.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
termbits.h [PATCH] tty: preparatory structures for termios revamp 2006-12-08 08:28:56 -08:00
termios.h [PATCH] consolidate line discipline number definitions 2007-02-11 10:51:26 -08:00
thread_info.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
timex.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
tlb.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
tlbflush.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
topology.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
traps.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
types.h [PATCH] Centralise definitions of sector_t and blkcnt_t 2006-12-04 19:41:15 -08:00
uaccess.h Remove a couple final references to obsolete verify_area(). 2007-02-09 15:01:56 +01:00
ucontext.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
unaligned.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
unistd.h [AVR32] Wire up the SysV IPC calls properly 2007-02-16 12:54:44 +01:00
user.h [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00