diff options
| -rw-r--r-- | Documentation/spi/spi-summary | 13 | ||||
| -rw-r--r-- | drivers/mtd/devices/m25p80.c | 4 | ||||
| -rw-r--r-- | drivers/mtd/devices/mtd_dataflash.c | 2 | ||||
| -rw-r--r-- | drivers/spi/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/spi/Makefile | 1 |
5 files changed, 28 insertions, 2 deletions
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"? ---------------------------------------- diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c index 45108ed8558..d5f24089be7 100644 --- a/drivers/mtd/devices/m25p80.c +++ b/drivers/mtd/devices/m25p80.c @@ -378,7 +378,9 @@ static int m25p80_write(struct mtd_info *mtd, loff_t to, size_t len, spi_sync(flash->spi, &m); - *retlen += m.actual_length - sizeof(flash->command); + if (retlen) + *retlen += m.actual_length + - sizeof(flash->command); } } diff --git a/drivers/mtd/devices/mtd_dataflash.c b/drivers/mtd/devices/mtd_dataflash.c index 99d3a0320fc..155737e7483 100644 --- a/drivers/mtd/devices/mtd_dataflash.c +++ b/drivers/mtd/devices/mtd_dataflash.c @@ -508,7 +508,7 @@ add_dataflash(struct spi_device *spi, char *name, priv->partitioned = 1; return add_mtd_partitions(device, parts, nr_parts); } - } else if (pdata->nr_parts) + } else if (pdata && pdata->nr_parts) dev_warn(&spi->dev, "ignoring %d default partitions on %s\n", pdata->nr_parts, device->name); diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 9b21c5d77b4..7a75faeb052 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -65,6 +65,16 @@ config SPI_BITBANG need it. You only need to select this explicitly to support driver modules that aren't part of this kernel tree. +config SPI_BUTTERFLY + tristate "Parallel port adapter for AVR Butterfly (DEVELOPMENT)" + depends on SPI_MASTER && PARPORT && EXPERIMENTAL + select SPI_BITBANG + help + This uses a custom parallel port cable to connect to an AVR + Butterfly <http://www.atmel.com/products/avr/butterfly>, an + inexpensive battery powered microcontroller evaluation board. + This same cable can be used to flash new firmware. + # # Add new SPI master controllers in alphabetical order above this line # diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index 5da6a4df401..c2c87e845ab 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -12,6 +12,7 @@ obj-$(CONFIG_SPI_MASTER) += spi.o # SPI master controller drivers (bus) obj-$(CONFIG_SPI_BITBANG) += spi_bitbang.o +obj-$(CONFIG_SPI_BUTTERFLY) += spi_butterfly.o # ... add above this line ... # SPI protocol drivers (device/link on bus) |