[PATCH] i2c: New bus driver for the OpenCores I2C controller

The following patch adds support for the OpenCores I2C controller IP
core (See http://www.opencores.org/projects.cgi/web/i2c/overview).

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 51 insertions, 0 deletions

diff --git a/Documentation/i2c/busses/i2c-ocores b/Documentation/i2c/busses/i2c-ocores
new file mode 100644
index 00000000000..cfcebb10d14
--- /dev/null
+++ b/Documentation/i2c/busses/i2c-ocores
@@ -0,0 +1,51 @@
+Kernel driver i2c-ocores
+
+Supported adapters:
+  * OpenCores.org I2C controller by Richard Herveille (see datasheet link)
+    Datasheet: http://www.opencores.org/projects.cgi/web/i2c/overview
+
+Author: Peter Korsgaard <jacmet@sunsite.dk>
+
+Description
+-----------
+
+i2c-ocores is an i2c bus driver for the OpenCores.org I2C controller
+IP core by Richard Herveille.
+
+Usage
+-----
+
+i2c-ocores uses the platform bus, so you need to provide a struct
+platform_device with the base address and interrupt number. The
+dev.platform_data of the device should also point to a struct
+ocores_i2c_platform_data (see linux/i2c-ocores.h) describing the
+distance between registers and the input clock speed.
+
+E.G. something like:
+
+static struct resource ocores_resources[] = {
+        [0] = {
+                .start  = MYI2C_BASEADDR,
+                .end    = MYI2C_BASEADDR + 8,
+                .flags  = IORESOURCE_MEM,
+        },
+        [1] = {
+                .start  = MYI2C_IRQ,
+                .end    = MYI2C_IRQ,
+                .flags  = IORESOURCE_IRQ,
+        },
+};
+
+static struct ocores_i2c_platform_data myi2c_data = {
+        .regstep        = 2,            /* two bytes between registers */
+        .clock_khz      = 50000,        /* input clock of 50MHz */
+};
+
+static struct platform_device myi2c = {
+        .name                   = "ocores-i2c",
+        .dev = {
+                .platform_data  = &myi2c_data,
+        },
+        .num_resources          = ARRAY_SIZE(ocores_resources),
+        .resource               = ocores_resources,
+};