[U-Boot] [PATCH] driver/net/fec: support fixed speed connection

[Stefano Babic <sbabic@denx.de>]

Hi Hannes,

On 22/06/2016 12:07, Hannes Schmelzer wrote:
> If MAC is directly connected to another MAC (like a switch for example)
> we don't need to probe for a phy, autoneogation and so on. We simply
> have to setup speed.
> 
> Signed-off-by: Hannes Schmelzer <oe5hpm@oevsv.at>
> ---
> 
>  doc/README.fec_mxc    | 5 +++++
>  drivers/net/fec_mxc.c | 4 ++++
>  2 files changed, 9 insertions(+)
> 
> diff --git a/doc/README.fec_mxc b/doc/README.fec_mxc
> index ed7e47d..9ca6ac2 100644
> --- a/doc/README.fec_mxc
> +++ b/doc/README.fec_mxc
> @@ -27,6 +27,11 @@ CONFIG_FEC_MXC_PHYADDR
>  	Optional, selects the exact phy address that should be connected
>  	and function fecmxc_initialize will try to initialize it.
>  
> +CONFIG_FEC_FIXED_SPEED
> +	Optional, selects a fixed speed on the MAC interface without asking some
> +	phy. This is usefull if there is a direct MAC <-> MAC connection, for
> +	example if the CPU is connected directly via the RGMII interface to a
> +	ethernet-switch.
>  
>  Reading the ethaddr from the SoC eFuses:
>  if CONFIG_FEC_MXC is defined and the U-Boot environment does not contain the
> diff --git a/drivers/net/fec_mxc.c b/drivers/net/fec_mxc.c
> index 360f8e4..e871b3e 100644
> --- a/drivers/net/fec_mxc.c
> +++ b/drivers/net/fec_mxc.c
> @@ -233,6 +233,7 @@ static int miiphy_restart_aneg(struct eth_device *dev)
>  	return ret;
>  }
>  
> +#ifndef CONFIG_FEC_FIXED_SPEED
>  static int miiphy_wait_aneg(struct eth_device *dev)
>  {
>  	uint32_t start;
> @@ -260,6 +261,7 @@ static int miiphy_wait_aneg(struct eth_device *dev)
>  
>  	return 0;
>  }
> +#endif /* CONFIG_FEC_FIXED_SPEED */
>  #endif
>  
>  static int fec_rx_task_enable(struct fec_priv *fec)
> @@ -502,6 +504,8 @@ static int fec_open(struct eth_device *edev)
>  		}
>  		speed = fec->phydev->speed;
>  	}
> +#elif CONFIG_FEC_FIXED_SPEED
> +	speed = CONFIG_FEC_FIXED_SPEED;
>  #else
>  	miiphy_wait_aneg(edev);
>  	speed = miiphy_speed(edev->name, fec->phy_id);
> 


Really I had already sent a patch for this issue, and I merged this into
u-boot-imx, - next

http://git.denx.de/?p=u-boot/u-boot-imx.git;a=commit;h=57b7371e24e429ee37403cfb084d142cf7699bd7

Anyway, your patch is more complete as mine. I will drop my patch and
substitute with your.

Best regards,
Stefano Babic


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