mcp23s08: add i2c support
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>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 47eae6e..3634986 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -412,10 +412,11 @@
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