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authorDavid Brownell <david-b@pacbell.net>2006-01-09 00:34:19 +0300
committerGreg Kroah-Hartman <gregkh@suse.de>2006-01-14 03:29:54 +0300
commit8ae12a0d85987dc138f8c944cb78a92bf466cea0 (patch)
treeca032f25bb26f88cc35d68c6f8065143ce64a6a8 /drivers/Makefile
parent67daf5f11f06b9b15f8320de1d237ccc2e74fe43 (diff)
downloadlinux-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/Makefile1
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/