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authorPeter Korsgaard <jacmet@sunsite.dk>2006-06-04 20:01:08 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2006-06-22 11:10:33 -0700
commit18f98b1e3147afdb51e545cc6ff2b016c7d088a7 (patch)
tree5f974b01a7efadabe037ace19a0f33037d36a4b7 /Documentation/i2c
parentaee62305345863430a937af289b9bd080a100dac (diff)
downloadlinux-linaro-stable-18f98b1e3147afdb51e545cc6ff2b016c7d088a7.tar.gz
[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>
Diffstat (limited to 'Documentation/i2c')
-rw-r--r--Documentation/i2c/busses/i2c-ocores51
1 files changed, 51 insertions, 0 deletions
diff --git a/Documentation/i2c/busses/i2c-ocores b/Documentation/i2c/busses/i2c-ocores
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+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,
+};