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authorLinus Torvalds <torvalds@linux-foundation.org>2012-10-03 00:26:42 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-03 00:26:42 (GMT)
commit7fe0b14b725d6d09a1d9e1409bd465cb88b587f9 (patch)
tree89b5ffca03145618da92c75fb3cc1dda87dbb924 /Documentation/spi
parent7a9a2970b5c1c2ce73d4bb84edaa7ebf13e0c841 (diff)
parent536a53a300d0d40152796eefb0a9e6e36ca37f7d (diff)
Merge tag 'spi-3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/misc
Pull spi updates from Mark Brown: "No framework work here, only a bunch of driver updates of varying sizes: - Factoring out of the core hardware support from the MXS MMC driver by Marek Vasut to allow the hardware to also be used for SPI. - Lots of error handling cleanups from Guenter Roeck - Removal of the existing Tegra driver which is quite comprehensively broken as detailed in the changelog for the removal. - DT suppport for the PL022 and GPIO drivers. - pinctrl support for OMAP and PL022." Pulling from Mark Brown as Grant Likely is still busy moving. * tag 'spi-3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/misc: (53 commits) spi: remove completely broken Tegra driver spi/imx: set the inactive state of the clock according to the clock polarity spi/pl022: get/put resources on suspend/resume spi/pl022: use more managed resources spi/pl022: Devicetree support w/o platform data spi/s3c64xx: Don't free controller_data on non-dt platforms spi: omap2-mcspi: add pinctrl support spi/pl022: adopt pinctrl support spi: omap2-mcspi: Cleanup the omap2_mcspi_txrx_dma function spi/gpio: Fix stub for spi_gpio_probe_dt() spi/mxs: Make the SPI block clock speed configurable via DT spi: spi-sh-hspi: drop frees of devm_ alloc'd data spi/pl022: Fix chipselects pointer computation spi: spi-tle62x0: Use module_spi_driver macro mxs/spi: Rework the mxs_ssp_timeout to be more readable mxs/spi: Decrement the DMA/PIO border mxs/spi: Increment the transfer length only if transfer succeeded mxs/spi: Fix issues when doing long continuous transfer spi: spi-gpio: Add DT bindings spi: spi-gpio: store chipselect information in private structure ...
Diffstat (limited to 'Documentation/spi')
-rw-r--r--Documentation/spi/spi-sc18is60236
1 files changed, 36 insertions, 0 deletions
diff --git a/Documentation/spi/spi-sc18is602 b/Documentation/spi/spi-sc18is602
new file mode 100644
index 0000000..a457028
--- /dev/null
+++ b/Documentation/spi/spi-sc18is602
@@ -0,0 +1,36 @@
+Kernel driver spi-sc18is602
+===========================
+
+Supported chips:
+ * NXP SI18IS602/602B/603
+ Datasheet: http://www.nxp.com/documents/data_sheet/SC18IS602_602B_603.pdf
+
+Author:
+ Guenter Roeck <linux@roeck-us.net>
+
+
+Description
+-----------
+
+This driver provides connects a NXP SC18IS602/603 I2C-bus to SPI bridge to the
+kernel's SPI core subsystem.
+
+The driver does not probe for supported chips, since the SI18IS602/603 does not
+support Chip ID registers. You will have to instantiate the devices explicitly.
+Please see Documentation/i2c/instantiating-devices for details.
+
+
+Usage Notes
+-----------
+
+This driver requires the I2C adapter driver to support raw I2C messages. I2C
+adapter drivers which can only handle the SMBus protocol are not supported.
+
+The maximum SPI message size supported by SC18IS602/603 is 200 bytes. Attempts
+to initiate longer transfers will fail with -EINVAL. EEPROM read operations and
+similar large accesses have to be split into multiple chunks of no more than
+200 bytes per SPI message (128 bytes of data per message is recommended). This
+means that programs such as "cp" or "od", which automatically use large block
+sizes to access a device, can not be used directly to read data from EEPROM.
+Programs such as dd, where the block size can be specified, should be used
+instead.

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