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| author | David Brownell <david-b@pacbell.net> | 2006-01-08 13:34:29 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-01-13 16:29:56 -0800 |
| commit | 7111763d391b0c5a949a4f2575aa88cd585f0ff6 (patch) | |
| tree | 376eef5003b71c6445c02bbe87950b2e365e0758 /Documentation/spi | |
| parent | 8275c642ccdce09a2146d0a9eb022e3698ee927e (diff) | |
| download | lwn-7111763d391b0c5a949a4f2575aa88cd585f0ff6.tar.gz lwn-7111763d391b0c5a949a4f2575aa88cd585f0ff6.zip | |
[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/spi')
| -rw-r--r-- | Documentation/spi/spi-summary | 13 |
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"? ---------------------------------------- |