netdev - Re: [PATCH v2 3/5] phy: ocelot-serdes: convert to use eth phy mode and submode

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Date:   Fri, 16 Nov 2018 12:15:31 +0100
From:   Quentin Schulz <quentin.schulz@...tlin.com>
To:     Grygorii Strashko <grygorii.strashko@...com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Kishon Vijay Abraham I <kishon@...com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        netdev@...r.kernel.org, Sekhar Nori <nsekhar@...com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Tony Lindgren <tony@...mide.com>,
        linux-amlogic@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Antoine Tenart <antoine.tenart@...e-electrons.com>,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>, Carlo Caione <carlo@...one.org>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Manu Gautam <mgautam@...eaurora.org>
Subject: Re: [PATCH v2 3/5] phy: ocelot-serdes: convert to use eth phy mode
 and submode

Hi Grygorii,

On Fri, Nov 09, 2018 at 05:47:53PM -0600, Grygorii Strashko wrote:
> Convert ocelot-serdes PHY driver to use recently introduced
> PHY_MODE_ETHERNET and phy_set_mode_ext().
> 

Thanks for the patch, it's annoying to have to map PHY_MODE_SGMII and
PHY_INTERFACE_MODE_SGMII :)

> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
> ---
>  drivers/net/ethernet/mscc/ocelot.c   |  9 ++-------
>  drivers/phy/mscc/phy-ocelot-serdes.c | 14 ++++++++++----
>  2 files changed, 12 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
> index 3238b9e..3edb608 100644
> --- a/drivers/net/ethernet/mscc/ocelot.c
> +++ b/drivers/net/ethernet/mscc/ocelot.c
> @@ -472,7 +472,6 @@ static int ocelot_port_open(struct net_device *dev)
>  {
>  	struct ocelot_port *port = netdev_priv(dev);
>  	struct ocelot *ocelot = port->ocelot;
> -	enum phy_mode phy_mode;
>  	int err;
>  
>  	/* Enable receiving frames on the port, and activate auto-learning of
> @@ -484,12 +483,8 @@ static int ocelot_port_open(struct net_device *dev)
>  			 ANA_PORT_PORT_CFG, port->chip_port);
>  
>  	if (port->serdes) {
> -		if (port->phy_mode == PHY_INTERFACE_MODE_SGMII)
> -			phy_mode = PHY_MODE_SGMII;
> -		else
> -			phy_mode = PHY_MODE_QSGMII;
> -
> -		err = phy_set_mode(port->serdes, phy_mode);
> +		err = phy_set_mode_ext(port->serdes, PHY_MODE_ETHERNET,
> +				       port->phy_mode);
>  		if (err) {
>  			netdev_err(dev, "Could not set mode of SerDes\n");
>  			return err;
> diff --git a/drivers/phy/mscc/phy-ocelot-serdes.c b/drivers/phy/mscc/phy-ocelot-serdes.c
> index c61a9890..f525a21 100644
> --- a/drivers/phy/mscc/phy-ocelot-serdes.c
> +++ b/drivers/phy/mscc/phy-ocelot-serdes.c
> @@ -11,6 +11,7 @@
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/of_platform.h>
> +#include <linux/phy.h>
>  #include <linux/phy/phy.h>
>  #include <linux/platform_device.h>
>  #include <linux/regmap.h>
> @@ -116,8 +117,10 @@ struct serdes_mux {
>  	.mux = _mux,						\
>  }
>  
> -#define SERDES_MUX_SGMII(i, p, m, c) SERDES_MUX(i, p, PHY_MODE_SGMII, m, c)
> -#define SERDES_MUX_QSGMII(i, p, m, c) SERDES_MUX(i, p, PHY_MODE_QSGMII, m, c)
> +#define SERDES_MUX_SGMII(i, p, m, c) \
> +	SERDES_MUX(i, p, PHY_INTERFACE_MODE_SGMII, m, c)
> +#define SERDES_MUX_QSGMII(i, p, m, c) \
> +	SERDES_MUX(i, p, PHY_INTERFACE_MODE_QSGMII, m, c)
>  
>  static const struct serdes_mux ocelot_serdes_muxes[] = {
>  	SERDES_MUX_SGMII(SERDES1G(0), 0, 0, 0),
> @@ -164,12 +167,15 @@ static int serdes_set_mode(struct phy *phy, enum phy_mode mode, int submode)
>  	unsigned int i;
>  	int ret;
>  
> +	if (mode != PHY_MODE_ETHERNET)
> +		return -EINVAL;
> +

This works for now because we only support Ethernet muxes for now but
this IP also supports PHY_MODE_PCIE.

It seems weird to me that the day we'll add support for PCIE muxing we
will have in ocelot_serdes_muxes[i].mode either a PHY_INTERFACE_MODE_*
or a PHY_MODE_PCIE. This is not an issue for now since you do the mode
!= PHY_MODE_ETHERNET just above but once we get rid of this, we only
test for submode != ocelot_serdes_muxes[i].mode and both
PHY_INTERFACE_MODE_1000BASEX and PHY_MODE_PCIE will have the same index
thus might be confused.

Should we add a submode to the SERDES_MUX macro, move PHY_MODE_*MII to
this submode and have PHY_MODE_ETHERNET/PCIE in the mode field?

Thanks,
Quentin

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