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authorLinus Torvalds <torvalds@linux-foundation.org>2012-05-26 13:35:03 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-26 13:35:03 -0700
commitae32adc1e06d096399f195eeda12d443d53539c4 (patch)
tree9fc69aaabc6a7b95d435ae7197f57aaa672933db /Documentation
parentf465d145d76803fe6332092775d891c8c509aa44 (diff)
parent9868a060ccf769c08ec378a9829137e272e9a92c (diff)
Merge branch 'i2c-embedded/for-next' of git://git.pengutronix.de/git/wsa/linux
Pull i2c-embedded changes from Wolfram Sang: "Major changes: - lots of devicetree additions for existing drivers. I tried hard to make sure the bindings are proper. In more complicated cases, I requested acks from people having more experience with them than me. That took a bit of extra time and also some time went into discussions with developers about what bindings are and what not. I have the feeling that the workflow with bindings should be improved to scale better. I will spend some more thought on this... - i2c-muxes are succesfully used meanwhile, so we dropped EXPERIMENTAL for them and renamed the drivers to a standard pattern to match the rest of the subsystem. They can also be used with devicetree now. - ixp2000 was removed since the whole platform goes away. - cleanups (strlcpy instead of strcpy, NULL instead of 0) - The rest is typical driver fixes I assume. All patches have been in linux-next at least since v3.4-rc6." Fixed up trivial conflict in arch/arm/mach-lpc32xx/common.c due to the same patch already having come in through the arm/soc trees, with additional patches on top of it. * 'i2c-embedded/for-next' of git://git.pengutronix.de/git/wsa/linux: (35 commits) i2c: davinci: Free requested IRQ in remove i2c: ocores: register OF i2c devices i2c: tegra: notify transfer-complete after clearing status. I2C: xiic: Add OF binding support i2c: Rename last mux driver to standard pattern i2c: tegra: fix 10bit address configuration i2c: muxes: rename first set of drivers to a standard pattern of/i2c: implement of_find_i2c_adapter_by_node i2c: implement i2c_verify_adapter i2c-s3c2410: Add HDMIPHY quirk for S3C2440 i2c-s3c2410: Rework device type handling i2c: muxes are not EXPERIMENTAL anymore i2c/of: Automatically populate i2c mux busses from device tree data. i2c: Add a struct device * parameter to i2c_add_mux_adapter() of/i2c: call i2c_verify_client from of_find_i2c_device_by_node i2c: designware: Add clk_{un}prepare() support i2c: designware: add PM support i2c: ixp2000: remove driver i2c: pnx: add device tree support i2c: imx: don't use strcpy but strlcpy ...
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/i2c/mux.txt60
-rw-r--r--Documentation/devicetree/bindings/i2c/samsung-i2c.txt8
-rw-r--r--Documentation/devicetree/bindings/i2c/xiic.txt22
-rw-r--r--Documentation/i2c/muxes/i2c-mux-gpio (renamed from Documentation/i2c/muxes/gpio-i2cmux)12
4 files changed, 94 insertions, 8 deletions
diff --git a/Documentation/devicetree/bindings/i2c/mux.txt b/Documentation/devicetree/bindings/i2c/mux.txt
new file mode 100644
index 000000000000..af84cce5cd7b
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/mux.txt
@@ -0,0 +1,60 @@
+Common i2c bus multiplexer/switch properties.
+
+An i2c bus multiplexer/switch will have several child busses that are
+numbered uniquely in a device dependent manner. The nodes for an i2c bus
+multiplexer/switch will have one child node for each child
+bus.
+
+Required properties:
+- #address-cells = <1>;
+- #size-cells = <0>;
+
+Required properties for child nodes:
+- #address-cells = <1>;
+- #size-cells = <0>;
+- reg : The sub-bus number.
+
+Optional properties for child nodes:
+- Other properties specific to the multiplexer/switch hardware.
+- Child nodes conforming to i2c bus binding
+
+
+Example :
+
+ /*
+ An NXP pca9548 8 channel I2C multiplexer at address 0x70
+ with two NXP pca8574 GPIO expanders attached, one each to
+ ports 3 and 4.
+ */
+
+ mux@70 {
+ compatible = "nxp,pca9548";
+ reg = <0x70>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ i2c@3 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <3>;
+
+ gpio1: gpio@38 {
+ compatible = "nxp,pca8574";
+ reg = <0x38>;
+ #gpio-cells = <2>;
+ gpio-controller;
+ };
+ };
+ i2c@4 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <4>;
+
+ gpio2: gpio@38 {
+ compatible = "nxp,pca8574";
+ reg = <0x38>;
+ #gpio-cells = <2>;
+ gpio-controller;
+ };
+ };
+ };
diff --git a/Documentation/devicetree/bindings/i2c/samsung-i2c.txt b/Documentation/devicetree/bindings/i2c/samsung-i2c.txt
index 38832c712919..b6cb5a12c672 100644
--- a/Documentation/devicetree/bindings/i2c/samsung-i2c.txt
+++ b/Documentation/devicetree/bindings/i2c/samsung-i2c.txt
@@ -6,14 +6,18 @@ Required properties:
- compatible: value should be either of the following.
(a) "samsung, s3c2410-i2c", for i2c compatible with s3c2410 i2c.
(b) "samsung, s3c2440-i2c", for i2c compatible with s3c2440 i2c.
+ (c) "samsung, s3c2440-hdmiphy-i2c", for s3c2440-like i2c used
+ inside HDMIPHY block found on several samsung SoCs
- reg: physical base address of the controller and length of memory mapped
region.
- interrupts: interrupt number to the cpu.
- samsung,i2c-sda-delay: Delay (in ns) applied to data line (SDA) edges.
- - gpios: The order of the gpios should be the following: <SDA, SCL>.
- The gpio specifier depends on the gpio controller.
Optional properties:
+ - gpios: The order of the gpios should be the following: <SDA, SCL>.
+ The gpio specifier depends on the gpio controller. Required in all
+ cases except for "samsung,s3c2440-hdmiphy-i2c" whose input/output
+ lines are permanently wired to the respective client
- samsung,i2c-slave-addr: Slave address in multi-master enviroment. If not
specified, default value is 0.
- samsung,i2c-max-bus-freq: Desired frequency in Hz of the bus. If not
diff --git a/Documentation/devicetree/bindings/i2c/xiic.txt b/Documentation/devicetree/bindings/i2c/xiic.txt
new file mode 100644
index 000000000000..ceabbe91ae44
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/xiic.txt
@@ -0,0 +1,22 @@
+Xilinx IIC controller:
+
+Required properties:
+- compatible : Must be "xlnx,xps-iic-2.00.a"
+- reg : IIC register location and length
+- interrupts : IIC controller unterrupt
+- #address-cells = <1>
+- #size-cells = <0>
+
+Optional properties:
+- Child nodes conforming to i2c bus binding
+
+Example:
+
+ axi_iic_0: i2c@40800000 {
+ compatible = "xlnx,xps-iic-2.00.a";
+ interrupts = < 1 2 >;
+ reg = < 0x40800000 0x10000 >;
+
+ #size-cells = <0>;
+ #address-cells = <1>;
+ };
diff --git a/Documentation/i2c/muxes/gpio-i2cmux b/Documentation/i2c/muxes/i2c-mux-gpio
index 811cd78d4cdc..bd9b2299b739 100644
--- a/Documentation/i2c/muxes/gpio-i2cmux
+++ b/Documentation/i2c/muxes/i2c-mux-gpio
@@ -1,11 +1,11 @@
-Kernel driver gpio-i2cmux
+Kernel driver i2c-gpio-mux
Author: Peter Korsgaard <peter.korsgaard@barco.com>
Description
-----------
-gpio-i2cmux is an i2c mux driver providing access to I2C bus segments
+i2c-gpio-mux is an i2c mux driver providing access to I2C bus segments
from a master I2C bus and a hardware MUX controlled through GPIO pins.
E.G.:
@@ -26,16 +26,16 @@ according to the settings of the GPIO pins 1..N.
Usage
-----
-gpio-i2cmux uses the platform bus, so you need to provide a struct
+i2c-gpio-mux uses the platform bus, so you need to provide a struct
platform_device with the platform_data pointing to a struct
gpio_i2cmux_platform_data with the I2C adapter number of the master
bus, the number of bus segments to create and the GPIO pins used
-to control it. See include/linux/gpio-i2cmux.h for details.
+to control it. See include/linux/i2c-gpio-mux.h for details.
E.G. something like this for a MUX providing 4 bus segments
controlled through 3 GPIO pins:
-#include <linux/gpio-i2cmux.h>
+#include <linux/i2c-gpio-mux.h>
#include <linux/platform_device.h>
static const unsigned myboard_gpiomux_gpios[] = {
@@ -57,7 +57,7 @@ static struct gpio_i2cmux_platform_data myboard_i2cmux_data = {
};
static struct platform_device myboard_i2cmux = {
- .name = "gpio-i2cmux",
+ .name = "i2c-gpio-mux",
.id = 0,
.dev = {
.platform_data = &myboard_i2cmux_data,