netdev - Re: [PATCH net-next] net: dsa: LAN9303: add i2c dependency

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Date:   Mon, 24 Apr 2017 10:22:04 +0200
From:   Juergen Borleis <jbe@...gutronix.de>
To:     Tobias Regnery <tobias.regnery@...il.com>
Cc:     andrew@...n.ch, vivien.didelot@...oirfairelinux.com,
        f.fainelli@...il.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: dsa: LAN9303: add i2c dependency

Hi Tobias,

On Monday 24 April 2017 10:07:37 Tobias Regnery wrote:
> The Kconfig symbol for the I2C mode of the LAN9303 driver selects
> REGMAP_I2C. This symbol depends on I2C but the driver doesen't has a
> dependency on I2C.
>
> With CONFIG_I2C=n kconfig fails to select REGMAP_I2C and we get the
> following warning:
>
> warning: (NET_DSA_SMSC_LAN9303_I2C) selects REGMAP_I2C which has unmet
> direct dependencies (I2C)
>
> This results in a build failure because the regmap-i2c functions aren't
> available:
>
> drivers/base/regmap/regmap-i2c.c: In function 'regmap_smbus_byte_reg_read':
> drivers/base/regmap/regmap-i2c.c:29:8: error: implicit declaration of function 'i2c_smbus_read_byte_data' [-Werror=implicit-function-declaration]
>
> drivers/base/regmap/regmap-i2c.c: In function 'regmap_smbus_byte_reg_write':
> drivers/base/regmap/regmap-i2c.c:47:9: error: implicit declaration of function 'i2c_smbus_write_byte_data' [-Werror=implicit-function-declaration]
> ... 
>
> Fix this by adding a kconfig dependency on the I2C subsystem.
>
> Fixes: be4e119f9914 ("net: dsa: LAN9303: add I2C managed mode support")
> Signed-off-by: Tobias Regnery <tobias.regnery@...il.com>
> ---
>  drivers/net/dsa/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/dsa/Kconfig b/drivers/net/dsa/Kconfig
> index 131a5b1cbfc8..862ee22303c2 100644
> --- a/drivers/net/dsa/Kconfig
> +++ b/drivers/net/dsa/Kconfig
> @@ -59,7 +59,7 @@ config NET_DSA_SMSC_LAN9303
>
>  config NET_DSA_SMSC_LAN9303_I2C
>  	tristate "SMSC/Microchip LAN9303 3-ports 10/100 ethernet switch in I2C managed mode"
> -	depends on NET_DSA 
> +	depends on NET_DSA && I2C
>  	select NET_DSA_SMSC_LAN9303
>  	select REGMAP_I2C
>  	---help---

Thanks, but already found and fixed by Arnd Bergmann.

jb

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Pengutronix e.K.                             | Juergen Borleis             |
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