linux/arch
David Brownell 8ae12a0d85 [PATCH] spi: simple SPI framework
This is the core of a small SPI framework, implementing the model of a
queue of messages which complete asynchronously (with thin synchronous
wrappers on top).

  - It's still less than 2KB of ".text" (ARM).  If there's got to be a
    mid-layer for something so simple, that's the right size budget.  :)

  - The guts use board-specific SPI device tables to build the driver
    model tree.  (Hardware probing is rarely an option.)

  - This version of Kconfig includes no drivers.  At this writing there
    are two known master controller drivers (PXA/SSP, OMAP MicroWire)
    and three protocol drivers (CS8415a, ADS7846, DataFlash) with LKML
    mentions of other drivers in development.

  - No userspace API.  There are several implementations to compare.
    Implement them like any other driver, and bind them with sysfs.

The changes from last version posted to LKML (on 11-Nov-2005) are minor,
and include:

  - One bugfix (removes a FIXME), with the visible effect of making device
    names be "spiB.C" where B is the bus number and C is the chipselect.

  - The "caller provides DMA mappings" mechanism now has kerneldoc, for
    DMA drivers that want to be fancy.

  - Hey, the framework init can be subsys_init.  Even though board init
    logic fires earlier, at arch_init ... since the framework init is
    for driver support, and the board init support uses static init.

  - Various additional spec/doc clarifications based on discussions
    with other folk.  It adds a brief "thank you" at the end, for folk
    who've helped nudge this framework into existence.

As I've said before, I think that "protocol tweaking" is the main support
that this driver framework will need to evolve.

From: Mark Underwood <basicmark@yahoo.com>

  Update the SPI framework to remove a potential priority inversion case by
  reverting to kmalloc if the pre-allocated DMA-safe buffer isn't available.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-01-13 16:29:54 -08:00
..
alpha [PATCH] alpha: task_pt_regs() 2006-01-12 09:08:50 -08:00
arm [PATCH] spi: simple SPI framework 2006-01-13 16:29:54 -08:00
arm26 [PATCH] arm26: task_stack_page() 2006-01-12 09:08:57 -08:00
cris [PATCH] cris: task_thread_info() 2006-01-12 09:08:58 -08:00
frv [PATCH] frv: task_thread_info(), task_stack_page() 2006-01-12 09:08:54 -08:00
h8300 [PATCH] h8300: task_stack_page() 2006-01-12 09:08:55 -08:00
i386 [PATCH] i386: task_stack_page() 2006-01-12 09:08:52 -08:00
ia64 [PATCH] ia64: task_pt_regs() 2006-01-12 09:08:58 -08:00
m32r [PATCH] m32r: task_pt_regs(), task_stack_page(), task_thread_info() 2006-01-12 09:08:54 -08:00
m68k [PATCH] m68k: console code in head.S needs framebuffer support built in 2006-01-12 09:09:06 -08:00
m68knommu [PATCH] m68knommu: task_stack_page() 2006-01-12 09:08:55 -08:00
mips [PATCH] mips: task_stack_page() 2006-01-12 09:08:59 -08:00
parisc [PATCH] parisc: task_stack_page(), task_thread_info() 2006-01-12 09:08:55 -08:00
powerpc Merge git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc-merge 2006-01-12 10:21:22 -08:00
ppc Merge git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc-merge 2006-01-12 10:21:22 -08:00
s390 [PATCH] s390: task_stack_page() 2006-01-12 09:08:54 -08:00
sh [PATCH] sh: task_stack_page() 2006-01-12 09:08:53 -08:00
sh64 [PATCH] sh64: task_stack_page() 2006-01-12 09:08:57 -08:00
sparc [PATCH] sparc: task_stack_page() 2006-01-12 09:08:53 -08:00
sparc64 [PATCH] sparc64: task_pt_regs() 2006-01-12 09:08:52 -08:00
um [PATCH] uml: task_stack_page() 2006-01-12 09:08:53 -08:00
v850 [PATCH] v850: task_stack_page(), task_pt_regs() 2006-01-12 09:08:54 -08:00
x86_64 [PATCH] amd64: task_stack_page() 2006-01-12 09:08:51 -08:00
xtensa [PATCH] xtensa: task_pt_regs(), task_stack_page() 2006-01-12 09:08:54 -08:00