docs: i2c: convert to ReST and add to driver-api bookset

Convert each file at I2C subsystem, renaming them to .rst and
adding to the driver-api book.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Acked-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

1 files changed, 70 insertions, 0 deletions

diff --git a/Documentation/i2c/busses/i2c-ocores.rst b/Documentation/i2c/busses/i2c-ocores.rst
new file mode 100644
index 000000000000..f5e175f2a2a6
--- /dev/null
+++ b/Documentation/i2c/busses/i2c-ocores.rst
@@ -0,0 +1,70 @@
+========================
+Kernel driver i2c-ocores
+========================
+
+Supported adapters:
+  * OpenCores.org I2C controller by Richard Herveille (see datasheet link)
+    https://opencores.org/project/i2c/overview
+
+Author: Peter Korsgaard <peter@korsgaard.com>
+
+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/platform_data/i2c-ocores.h) describing the
+distance between registers and the input clock speed.
+There is also a possibility to attach a list of i2c_board_info which
+the i2c-ocores driver will add to the bus upon creation.
+
+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,
+	},
+  };
+
+  /* optional board info */
+  struct i2c_board_info ocores_i2c_board_info[] = {
+	{
+		I2C_BOARD_INFO("tsc2003", 0x48),
+		.platform_data = &tsc2003_platform_data,
+		.irq = TSC_IRQ
+	},
+	{
+		I2C_BOARD_INFO("adv7180", 0x42 >> 1),
+		.irq = ADV_IRQ
+	}
+  };
+
+  static struct ocores_i2c_platform_data myi2c_data = {
+	.regstep	= 2,		/* two bytes between registers */
+	.clock_khz	= 50000,	/* input clock of 50MHz */
+	.devices	= ocores_i2c_board_info, /* optional table of devices */
+	.num_devices	= ARRAY_SIZE(ocores_i2c_board_info), /* table size */
+  };
+
+  static struct platform_device myi2c = {
+	.name			= "ocores-i2c",
+	.dev = {
+		.platform_data	= &myi2c_data,
+	},
+	.num_resources		= ARRAY_SIZE(ocores_resources),
+	.resource		= ocores_resources,
+  };