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| author | David Brownell <david-b@pacbell.net> | 2006-01-09 00:34:19 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-01-14 03:29:54 +0300 |
| commit | 8ae12a0d85987dc138f8c944cb78a92bf466cea0 (patch) | |
| tree | ca032f25bb26f88cc35d68c6f8065143ce64a6a8 /drivers/Makefile | |
| parent | 67daf5f11f06b9b15f8320de1d237ccc2e74fe43 (diff) | |
| download | linux-8ae12a0d85987dc138f8c944cb78a92bf466cea0.tar.xz | |
[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>
Diffstat (limited to 'drivers/Makefile')
| -rw-r--r-- | drivers/Makefile | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/Makefile b/drivers/Makefile index 7fc3f0f08b29..7c45050ecd03 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -41,6 +41,7 @@ obj-$(CONFIG_FUSION) += message/ obj-$(CONFIG_IEEE1394) += ieee1394/ obj-y += cdrom/ obj-$(CONFIG_MTD) += mtd/ +obj-$(CONFIG_SPI) += spi/ obj-$(CONFIG_PCCARD) += pcmcia/ obj-$(CONFIG_DIO) += dio/ obj-$(CONFIG_SBUS) += sbus/ |