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mcp23s08: add i2c support

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Add i2c bindings for the mcp230xx devices. This is quite a lot simpler
than the spi one as there's no funky sub addressing done (one struct
i2c_client per struct gpio_chip).

The mcp23s08_platform_data structure is reused for i2c, even though
only a single mcp23s08_chip_info structure is needed.

To use, simply fill out a platform_data structure and pass it in
i2c_board_info, E.G.:

static const struct mcp23s08_platform_data mcp23017_data = {
	.chip[0] = {
		.pullups = 0x00ff,
	},
	.base = 240,
};

static struct i2c_board_info __initdata i2c_devs[] = {
	{ I2C_BOARD_INFO("mcp23017", 0x20),
	  .platform_data = &smartview_mcp23017_data, },
	...
};

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Peter Korsgaard
2011-07-15 10:25:32 +02:00
committed by Grant Likely
parent d62b98f305
commit 752ad5e82d
2 changed files with 191 additions and 8 deletions
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7
drivers/gpio/Kconfig
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@@ -412,10 +412,11 @@ config GPIO_MAX7301
GPIO driver for Maxim MAX7301 SPI-based GPIO expander.
config GPIO_MCP23S08
tristate "Microchip MCP23Sxx I/O expander"
depends on SPI_MASTER
tristate "Microchip MCP23xxx I/O expander"
depends on SPI_MASTER || I2C
help
SPI driver for Microchip MCP23S08/MPC23S17 I/O expanders.
SPI/I2C driver for Microchip MCP23S08/MCP23S17/MCP23008/MCP23017
I/O expanders.
This provides a GPIO interface supporting inputs and outputs.
config GPIO_MC33880