path: root/Documentation
diff options
authorLinus Torvalds <torvalds@linux-foundation.org>2014-01-25 13:20:36 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-25 13:20:36 -0800
commit2d2e7d195b902c419bc0b69ced026aca444d69a8 (patch)
treea4caa21b9db159873897d64b553042a1ae920ab5 /Documentation
parent15333539a9b3022656f815f643a77f6b054b335f (diff)
parent8b8b773e6b611e6629ac01f85d401c949d153546 (diff)
Merge tag 'spi-v3.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi
Pull spi updates from Mark Brown: "A respun version of the merges for the pull request previously sent with a few additional fixes. The last two merges were fixed up by hand since the branches have moved on and currently have the prior merge in them. Quite a busy release for the SPI subsystem, mostly in cleanups big and small scattered through the stack rather than anything else: - New driver for the Broadcom BC63xx HSSPI controller - Fix duplicate device registration for ACPI - Conversion of s3c64xx to DMAEngine (this pulls in platform and DMA changes upon which the transiton depends) - Some small optimisations to reduce the amount of time we hold locks in the datapath, eliminate some redundant checks and the size of a spi_transfer - Lots of fixes, cleanups and general enhancements to drivers, especially the rspi and Atmel drivers" * tag 'spi-v3.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi: (112 commits) spi: core: Fix transfer failure when master->transfer_one returns positive value spi: Correct set_cs() documentation spi: Clarify transfer_one() w.r.t. spi_finalize_current_transfer() spi: Spelling s/finised/finished/ spi: sc18is602: Convert to use bits_per_word_mask spi: Remove duplicate code to set default bits_per_word setting spi/pxa2xx: fix compilation warning when !CONFIG_PM_SLEEP spi: clps711x: Add MODULE_ALIAS to support module auto-loading spi: rspi: Add missing clk_disable() calls in error and cleanup paths spi: rspi: Spelling s/transmition/transmission/ spi: rspi: Add support for specifying CPHA/CPOL spi/pxa2xx: initialize DMA channels to -1 to prevent inadvertent match spi: rspi: Add more QSPI register documentation spi: rspi: Add more RSPI register documentation spi: rspi: Remove dependency on DMAE for SHMOBILE spi/s3c64xx: Correct indentation spi: sh: Use spi_sh_clear_bit() instead of open-coded spi: bitbang: Grammar s/make to make/to make/ spi: sh-hspi: Spelling s/recive/receive/ spi: core: Improve tx/rx_nbits check comments ...
Diffstat (limited to 'Documentation')
3 files changed, 12 insertions, 6 deletions
diff --git a/Documentation/devicetree/bindings/spi/spi-bus.txt b/Documentation/devicetree/bindings/spi/spi-bus.txt
index 800dafe5b01b..e5a4d1b4acfe 100644
--- a/Documentation/devicetree/bindings/spi/spi-bus.txt
+++ b/Documentation/devicetree/bindings/spi/spi-bus.txt
@@ -67,7 +67,7 @@ only 1(SINGLE), 2(DUAL) and 4(QUAD).
Dual/Quad mode is not allowed when 3-wire mode is used.
If a gpio chipselect is used for the SPI slave the gpio number will be passed
-via the cs_gpio
+via the SPI master node cs-gpios property.
SPI example for an MPC5200 SPI bus:
spi@f00 {
diff --git a/Documentation/devicetree/bindings/spi/ti_qspi.txt b/Documentation/devicetree/bindings/spi/ti_qspi.txt
index 1f9641ade0b5..601a360531a5 100644
--- a/Documentation/devicetree/bindings/spi/ti_qspi.txt
+++ b/Documentation/devicetree/bindings/spi/ti_qspi.txt
@@ -3,6 +3,11 @@ TI QSPI controller.
Required properties:
- compatible : should be "ti,dra7xxx-qspi" or "ti,am4372-qspi".
- reg: Should contain QSPI registers location and length.
+- reg-names: Should contain the resource reg names.
+ - qspi_base: Qspi configuration register Address space
+ - qspi_mmap: Memory mapped Address space
+ - (optional) qspi_ctrlmod: Control module Address space
+- interrupts: should contain the qspi interrupt number.
- #address-cells, #size-cells : Must be present if the device has sub-nodes
- ti,hwmods: Name of the hwmod associated to the QSPI
@@ -14,7 +19,8 @@ Example:
qspi: qspi@4b300000 {
compatible = "ti,dra7xxx-qspi";
- reg = <0x4b300000 0x100>;
+ reg = <0x47900000 0x100>, <0x30000000 0x3ffffff>;
+ reg-names = "qspi_base", "qspi_mmap";
#address-cells = <1>;
#size-cells = <0>;
spi-max-frequency = <25000000>;
diff --git a/Documentation/spi/spi-summary b/Documentation/spi/spi-summary
index f21edb983413..f72e0d1e0da8 100644
--- a/Documentation/spi/spi-summary
+++ b/Documentation/spi/spi-summary
@@ -34,7 +34,7 @@ SPI slave functions are usually not interoperable between vendors
- It may also be used to stream data in either direction (half duplex),
or both of them at the same time (full duplex).
- - Some devices may use eight bit words. Others may different word
+ - Some devices may use eight bit words. Others may use different word
lengths, such as streams of 12-bit or 20-bit digital samples.
- Words are usually sent with their most significant bit (MSB) first,
@@ -121,7 +121,7 @@ active. So the master must set the clock to inactive before selecting
a slave, and the slave can tell the chosen polarity by sampling the
clock level when its select line goes active. That's why many devices
support for example both modes 0 and 3: they don't care about polarity,
-and alway clock data in/out on rising clock edges.
+and always clock data in/out on rising clock edges.
How do these driver programming interfaces work?
@@ -139,7 +139,7 @@ a command and then reading its response.
There are two types of SPI driver, here called:
- Controller drivers ... controllers may be built in to System-On-Chip
+ Controller drivers ... controllers may be built into System-On-Chip
processors, and often support both Master and Slave roles.
These drivers touch hardware registers and may use DMA.
Or they can be PIO bitbangers, needing just GPIO pins.
@@ -548,7 +548,7 @@ SPI MASTER METHODS
master->transfer(struct spi_device *spi, struct spi_message *message)
- This must not sleep. Its responsibility is arrange that the
+ This must not sleep. Its responsibility is to arrange that the
transfer happens and its complete() callback is issued. The two
will normally happen later, after other transfers complete, and
if the controller is idle it will need to be kickstarted. This

Privacy Policy