summaryrefslogtreecommitdiffstats
path: root/Documentation
diff options
context:
space:
mode:
authorDavid Brownell <david-b@pacbell.net>2006-01-08 13:34:29 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2006-01-13 16:29:56 -0800
commit7111763d391b0c5a949a4f2575aa88cd585f0ff6 (patch)
tree376eef5003b71c6445c02bbe87950b2e365e0758 /Documentation
parent8275c642ccdce09a2146d0a9eb022e3698ee927e (diff)
downloadlinux-7111763d391b0c5a949a4f2575aa88cd585f0ff6.tar.bz2
[PATCH] spi: misc fixes
This collects some small SPI patches that seem to be missing from the MM tree: - spi_butterfly kbuild hooks got dropped somehow; this restores them - quick fix for a (theoretical?) m25p80_write() oops noted by Andrew - quick fix for a potential config-specific oops for mtd_dataflash() - minor doc tweaks 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 'Documentation')
-rw-r--r--Documentation/spi/spi-summary13
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/spi/spi-summary b/Documentation/spi/spi-summary
index 761debf748e9..a5ffba33a351 100644
--- a/Documentation/spi/spi-summary
+++ b/Documentation/spi/spi-summary
@@ -115,6 +115,9 @@ shows up in sysfs in several locations:
/sys/devices/.../CTLR/spiB.C ... spi_device for on bus "B",
chipselect C, accessed through CTLR.
+ /sys/devices/.../CTLR/spiB.C/modalias ... identifies the driver
+ that should be used with this device (for hotplug/coldplug)
+
/sys/bus/spi/devices/spiB.C ... symlink to the physical
spiB-C device
@@ -247,6 +250,12 @@ driver is registered:
Like with other static board-specific setup, you won't unregister those.
+The widely used "card" style computers bundle memory, cpu, and little else
+onto a card that's maybe just thirty square centimeters. On such systems,
+your arch/.../mach-.../board-*.c file would primarily provide information
+about the devices on the mainboard into which such a card is plugged. That
+certainly includes SPI devices hooked up through the card connectors!
+
NON-STATIC CONFIGURATIONS
@@ -258,6 +267,10 @@ up the spi bus master, and will likely need spi_new_device() to provide the
board info based on the board that was hotplugged. Of course, you'd later
call at least spi_unregister_device() when that board is removed.
+When Linux includes support for MMC/SD/SDIO/DataFlash cards through SPI, those
+configurations will also be dynamic. Fortunately, those devices all support
+basic device identification probes, so that support should hotplug normally.
+
How do I write an "SPI Protocol Driver"?
----------------------------------------