linux-kernel - Re: [PATCH] pinctrl: mcp23s08: improve I2C Kconfig dependency

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Message-ID: <20170530102708.ssfstr7epbgq5jmp@earth>
Date:   Tue, 30 May 2017 12:27:08 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.co.uk>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pinctrl: mcp23s08: improve I2C Kconfig dependency

Hi,

On Tue, May 30, 2017 at 11:11:28AM +0200, Arnd Bergmann wrote:
> With "SPI_MASTER=y && I2C=m", we can build mcp23s08 as a built-in driver,
> which then results in a link failure:
> 
> drivers/pinctrl/built-in.o: In function `mcp23s08_probe_one.isra.0':
> :(.text+0x7910): undefined reference to `__devm_regmap_init_i2c'
> drivers/pinctrl/built-in.o: In function `mcp23s08_init':
> :(.init.text+0x110): undefined reference to `i2c_register_driver'
> drivers/pinctrl/built-in.o: In function `mcp23s08_exit':
> :(.exit.text+0x3c): undefined reference to `i2c_del_driver'
> 
> To avoid the problem, this adds another dependency on I2C that enforces
> mcp23s08 to be a loadable module whenever the I2C core is a module.
> 
> Fixes: 64ac43e6fa28 ("gpio: mcp23s08: move to pinctrl")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Sebastian Reichel <sebastian.reichel@...labora.co.uk>

-- Sebastian

> ---
>  drivers/pinctrl/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
> index becda8f47e9e..ab4630ea305c 100644
> --- a/drivers/pinctrl/Kconfig
> +++ b/drivers/pinctrl/Kconfig
> @@ -149,6 +149,7 @@ config PINCTRL_FALCON
>  config PINCTRL_MCP23S08
>  	tristate "Microchip MCP23xxx I/O expander"
>  	depends on SPI_MASTER || I2C
> +	depends on I2C || I2C=n
>  	select GPIOLIB_IRQCHIP
>  	select REGMAP_I2C if I2C
>  	select REGMAP_SPI if SPI_MASTER
> -- 
> 2.9.0
> 

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