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SubjectRe: [PATCH v2] gpio: mcp23s08: Fix build error when CONFIG_SPI_MASTER=y && CONFIG_I2C=m
From
This one I like a bit more.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>

On Sun, May 19, 2013 at 2:11 PM, Axel Lin <axel.lin@ingics.com> wrote:
> This patch fixes below build error when CONFIG_SPI_MASTER=y && CONFIG_I2C=m &&
> CONFIG_GPIO_MCP23S08=y.
>
> LD init/built-in.o
> drivers/built-in.o: In function `mcp23017_write':
> clkdev.c:(.text+0x1e14): undefined reference to `i2c_smbus_write_word_data'
> drivers/built-in.o: In function `mcp23017_read':
> clkdev.c:(.text+0x1e24): undefined reference to `i2c_smbus_read_word_data'
> drivers/built-in.o: In function `mcp23008_write':
> clkdev.c:(.text+0x1e8c): undefined reference to `i2c_smbus_write_byte_data'
> drivers/built-in.o: In function `mcp23008_read':
> clkdev.c:(.text+0x1e98): undefined reference to `i2c_smbus_read_byte_data'
> drivers/built-in.o: In function `mcp23008_read_regs':
> clkdev.c:(.text+0x1ed0): undefined reference to `i2c_smbus_read_byte_data'
> drivers/built-in.o: In function `mcp23s08_init':
> clkdev.c:(.init.text+0x30): undefined reference to `i2c_register_driver'
> drivers/built-in.o: In function `mcp23s08_exit':
> clkdev.c:(.exit.text+0x30): undefined reference to `i2c_del_driver'
> make: *** [vmlinux] Error 1
>
> When CONFIG_I2C=m, meaning we can't build the drivers in with I2C support.
> Thus don't allow the drivers to be compiled as built-in when CONFIG_I2C=m.
>
> The real fix though is to break the driver apart into a SPI part, an I2C part
> and a common part. But that's something for 3.11 while this is something for
> 3.10/stable.
>
> Signed-off-by: Axel Lin <axel.lin@ingics.com>
> ---
> drivers/gpio/Kconfig | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index 87d5670..6575d77 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -636,7 +636,7 @@ config GPIO_MAX7301
>
> config GPIO_MCP23S08
> tristate "Microchip MCP23xxx I/O expander"
> - depends on SPI_MASTER || I2C
> + depends on (SPI_MASTER && !I2C) || I2C
> help
> SPI/I2C driver for Microchip MCP23S08/MCP23S17/MCP23008/MCP23017
> I/O expanders.
> --
> 1.8.1.2
>
>
>
> --
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--
With Best Regards,
Andy Shevchenko


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