linux-kernel - Re: [PATCH v2] gpio: mcp23s08: Fix build error when CONFIG_SPI_MASTER=y && CONFIG

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Date:	Mon, 20 May 2013 19:17:14 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Axel Lin <axel.lin@...ics.com>
Cc:	Grant Likely <grant.likely@...aro.org>,
	Lars Poeschel <poeschel@...onage.de>,
	Peter Korsgaard <jacmet@...site.dk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] gpio: mcp23s08: Fix build error when
 CONFIG_SPI_MASTER=y && CONFIG_I2C=m

On Sun, May 19, 2013 at 1:11 PM, Axel Lin <axel.lin@...ics.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@...ics.com>

Applied for fixes with Andy's ACK.

Yours,
Linus Walleij
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