From 7111763d391b0c5a949a4f2575aa88cd585f0ff6 Mon Sep 17 00:00:00 2001 From: David Brownell Date: Sun, 8 Jan 2006 13:34:29 -0800 Subject: [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 Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman --- Documentation/spi/spi-summary | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'Documentation') diff --git a/Documentation/spi/spi-summary b/Documentation/spi/spi-summary index 761debf748e..a5ffba33a35 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"? ---------------------------------------- -- cgit v1.2.3