Re: [PATCH] ARM: orion5x: only call into phylib when available

[Florian Fainelli <f.fainelli@gmail.com>]

Hi Arnd,

On 03/28/2017 03:15 AM, Arnd Bergmann wrote:
> Board code cannot call mdiobus_register_board_info() when phylib
> or mdio_device is a loadable module:
> 
> arch/arm/plat-orion/common.o: In function `orion_ge00_switch_init':
> :(.init.text+0x474): undefined reference to `mdiobus_register_board_info'
> 
> I had a number of ideas for how this could be solved, but after the MDIO
> code got split out from PHYLIB it has gotten too hard, so I'm basically
> giving up, and only call the mdiobus_register_board_info() function
> if the MDIO layer is built-in to avoid the link error. This is similar
> to how we handle PHY registration on other ARM platforms.

Thanks for the fix, I still think we should be able to get
mdio-boardinfo.o to be either built-in or modular, but more importantly,
largely independent from MDIO_DEVICE and PHYLIB (and how they are selected).

Your fix is definitively needed, but I agree with you that we should
find something better (TBH, I was not expecting phy: Allow splitting
MDIO bus/device support from PHYs to be merged that quickly).

Thanks!

> 
> Fixes: 90eff9096c01 ("net: phy: Allow splitting MDIO bus/device support from PHYs")
> Fixes: 648ea0134069 ("net: phy: Allow pre-declaration of MDIO devices")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  arch/arm/mach-orion5x/Kconfig | 1 +
>  arch/arm/plat-orion/common.c  | 5 +++++
>  2 files changed, 6 insertions(+)
> 
> diff --git a/arch/arm/mach-orion5x/Kconfig b/arch/arm/mach-orion5x/Kconfig
> index 468b8cb7fd5f..e3429c8c2e38 100644
> --- a/arch/arm/mach-orion5x/Kconfig
> +++ b/arch/arm/mach-orion5x/Kconfig
> @@ -6,6 +6,7 @@ menuconfig ARCH_ORION5X
>  	select GPIOLIB
>  	select MVEBU_MBUS
>  	select PCI
> +	select PHYLIB if NETDEVICES
>  	select PLAT_ORION_LEGACY
>  	help
>  	  Support for the following Marvell Orion 5x series SoCs:
> diff --git a/arch/arm/plat-orion/common.c b/arch/arm/plat-orion/common.c
> index 9255b6d67ba5..aff6994950ba 100644
> --- a/arch/arm/plat-orion/common.c
> +++ b/arch/arm/plat-orion/common.c
> @@ -468,6 +468,7 @@ void __init orion_ge11_init(struct mv643xx_eth_platform_data *eth_data,
>  		    eth_data, &orion_ge11);
>  }
>  
> +#ifdef CONFIG_ARCH_ORION5X
>  /*****************************************************************************
>   * Ethernet switch
>   ****************************************************************************/
> @@ -480,6 +481,9 @@ void __init orion_ge00_switch_init(struct dsa_chip_data *d)
>  	struct mdio_board_info *bd;
>  	unsigned int i;
>  
> +	if (!IS_BUILTIN(CONFIG_PHYLIB))
> +		return;
> +
>  	for (i = 0; i < ARRAY_SIZE(d->port_names); i++)
>  		if (!strcmp(d->port_names[i], "cpu"))
>  			break;
> @@ -493,6 +497,7 @@ void __init orion_ge00_switch_init(struct dsa_chip_data *d)
>  
>  	mdiobus_register_board_info(&orion_ge00_switch_board_info, 1);
>  }
> +#endif
>  
>  /*****************************************************************************
>   * I2C
> 


-- 
Florian