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author | Peter Korsgaard <jacmet@sunsite.dk> | 2006-06-04 20:01:08 +0200 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-06-22 11:10:33 -0700 |
commit | 18f98b1e3147afdb51e545cc6ff2b016c7d088a7 (patch) | |
tree | 5f974b01a7efadabe037ace19a0f33037d36a4b7 /Documentation/i2c/busses | |
parent | aee62305345863430a937af289b9bd080a100dac (diff) | |
download | linux-3.10-18f98b1e3147afdb51e545cc6ff2b016c7d088a7.tar.gz linux-3.10-18f98b1e3147afdb51e545cc6ff2b016c7d088a7.tar.bz2 linux-3.10-18f98b1e3147afdb51e545cc6ff2b016c7d088a7.zip |
[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/busses')
-rw-r--r-- | Documentation/i2c/busses/i2c-ocores | 51 |
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, +}; |