netdev - Re: [PATCH RFC 3/3] net: renesas: rswitch: Pass host parameters to phydev

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Message-ID: <20221019124100.41c9bbaf@dellmb>
Date:   Wed, 19 Oct 2022 12:41:00 +0200
From:   Marek Behún <kabel@...nel.org>
To:     Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Cc:     linux@...linux.org.uk, andrew@...n.ch, hkallweit1@...il.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH RFC 3/3] net: renesas: rswitch: Pass host parameters to
 phydev

On Wed, 19 Oct 2022 17:50:52 +0900
Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com> wrote:

> Use of_phy_connect_with_host_params() to pass host parameters to
> phydev. Otherwise, connected PHY cannot work correctly.
> 
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
> ---
>  drivers/net/ethernet/renesas/rswitch.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/renesas/rswitch.c b/drivers/net/ethernet/renesas/rswitch.c
> index c604331bfd88..bb2f1e667210 100644
> --- a/drivers/net/ethernet/renesas/rswitch.c
> +++ b/drivers/net/ethernet/renesas/rswitch.c
> @@ -16,6 +16,7 @@
>  #include <linux/of_irq.h>
>  #include <linux/of_mdio.h>
>  #include <linux/of_net.h>
> +#include <linux/phy.h>
>  #include <linux/phy/phy.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/slab.h>
> @@ -1234,11 +1235,19 @@ static void rswitch_phy_remove_link_mode(struct rswitch_device *rdev,
>  
>  static int rswitch_phy_init(struct rswitch_device *rdev, struct device_node *phy)
>  {
> +	DECLARE_PHY_INTERFACE_MASK(host_interfaces);
>  	struct phy_device *phydev;
>  	int err = 0;
>  
> -	phydev = of_phy_connect(rdev->ndev, phy, rswitch_adjust_link, 0,
> -				rdev->etha->phy_interface);
> +	phy_interface_zero(host_interfaces);
> +	if (rdev->etha->phy_interface == PHY_INTERFACE_MODE_SGMII)
> +		__set_bit(PHY_INTERFACE_MODE_SGMII, host_interfaces);
> +
> +	phydev = of_phy_connect_with_host_params(rdev->ndev, phy,
> +						 rswitch_adjust_link, 0,
> +						 rdev->etha->phy_interface,
> +						 host_interfaces,
> +						 rdev->etha->speed);
>  	if (!phydev) {
>  		err = -ENOENT;
>  		goto out;

NAK. There already is API for doing this: phylink. Adding new, and so
much specific function for this is a waste. Just convert the rswitch
driver to phylink.

Please look at the documentation at
  Documentation/networking/sfp-phylink.rst

Marek