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Date: Fri, 27 Mar 2015 08:41:54 -0700
From: Florian Fainelli <f.fainelli@...il.com>
To: Stas Sergeev <stsp@...t.ru>
Cc: netdev <netdev@...r.kernel.org>,
Linux kernel <linux-kernel@...r.kernel.org>,
Stas Sergeev <stsp@...rs.sourceforge.net>,
Grant Likely <grant.likely@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH 4/6] of: add API for changing parameters of fixed link
2015-03-27 6:37 GMT-07:00 Stas Sergeev <stsp@...t.ru>:
>
> The following API is added:
> - of_phy_fixed_link_set_link() allows to set link state (up/down)
> - of_phy_fixed_link_set_speed() allows to set link speed
> - of_phy_fixed_link_set_duplex() allows to enable/disable duplex
>
> This API is needed when the MDIO-less link have some other means
> of a status passing to MAC, for example with in-band data (SGMII).
> MAC driver can then use that API to update the PHY status.
I do not think any of these changes are required, if you look at
drivers/net/dsa/bcm_sf2.c, there is a fixed_link_update callback to
re-act to link up/down interrupts (but this could easily be extended
to speed/duplex as well), by directly modifying a fixed_phy_status
structure.
Can you try that approach in mvneta?
>
> CC: Florian Fainelli <f.fainelli@...il.com>
> CC: Grant Likely <grant.likely@...aro.org>
> CC: Rob Herring <robh+dt@...nel.org>
> CC: netdev@...r.kernel.org
> CC: devicetree@...r.kernel.org
> CC: linux-kernel@...r.kernel.org
>
> Signed-off-by: Stas Sergeev <stsp@...rs.sourceforge.net>
> ---
> drivers/of/of_mdio.c | 72 +++++++++++++++++++++++++++++++++++++++++++++++
> include/linux/of_mdio.h | 17 +++++++++++
> 2 files changed, 89 insertions(+)
>
> diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
> index b3dc1e6..ade2426 100644
> --- a/drivers/of/of_mdio.c
> +++ b/drivers/of/of_mdio.c
> @@ -251,6 +251,69 @@ struct phy_device *of_phy_attach(struct net_device *dev,
> EXPORT_SYMBOL(of_phy_attach);
>
> #if defined(CONFIG_FIXED_PHY)
> +struct fixed_link_data {
> + struct fixed_phy_status status;
> + struct fixed_phy_status changed;
> +};
> +
> +static int of_phy_fixed_link_update(struct phy_device *phy,
> + struct fixed_phy_status *status)
> +{
> + struct fixed_link_data *priv = phy->priv;
> +
> + if (priv->changed.link) {
> + status->link = priv->status.link;
> + priv->changed.link = 0;
> + }
> + if (priv->changed.speed) {
> + status->speed = priv->status.speed;
> + priv->changed.speed = 0;
> + }
> + if (priv->changed.duplex) {
> + status->duplex = priv->status.duplex;
> + priv->changed.duplex = 0;
> + }
> + if (priv->changed.pause) {
> + status->pause = priv->status.pause;
> + priv->changed.pause = 0;
> + }
> + if (priv->changed.asym_pause) {
> + status->asym_pause = priv->status.asym_pause;
> + priv->changed.asym_pause = 0;
> + }
> + return 0;
> +}
> +
> +int of_phy_fixed_link_set_link(struct phy_device *phy, int link)
> +{
> + struct fixed_link_data *priv = phy->priv;
> +
> + priv->status.link = link;
> + priv->changed.link = 1;
> + return 0;
> +}
> +EXPORT_SYMBOL(of_phy_fixed_link_set_link);
> +
> +int of_phy_fixed_link_set_speed(struct phy_device *phy, int speed)
> +{
> + struct fixed_link_data *priv = phy->priv;
> +
> + priv->status.speed = speed;
> + priv->changed.speed = 1;
> + return 0;
> +}
> +EXPORT_SYMBOL(of_phy_fixed_link_set_speed);
> +
> +int of_phy_fixed_link_set_duplex(struct phy_device *phy, int duplex)
> +{
> + struct fixed_link_data *priv = phy->priv;
> +
> + priv->status.duplex = duplex;
> + priv->changed.duplex = 1;
> + return 0;
> +}
> +EXPORT_SYMBOL(of_phy_fixed_link_set_duplex);
> +
> /*
> * of_phy_is_fixed_link() and of_phy_register_fixed_link() must
> * support two DT bindings:
> @@ -287,6 +350,7 @@ int of_phy_register_fixed_link(struct device_node *np)
> const __be32 *fixed_link_prop;
> int len;
> struct phy_device *phy;
> + struct fixed_link_data *priv;
>
> /* New binding */
> fixed_link_node = of_get_child_by_name(np, "fixed-link");
> @@ -320,6 +384,14 @@ int of_phy_register_fixed_link(struct device_node *np)
> }
> }
>
> + priv = kmalloc(sizeof(*priv), GFP_KERNEL);
> + if (!priv) {
> + fixed_phy_unregister(phy);
> + return -ENOMEM;
> + }
> + memset(&priv->changed, 0, sizeof(priv->changed));
> + phy->priv = priv;
> + fixed_phy_set_link_update(phy, of_phy_fixed_link_update);
> return 0;
> }
> EXPORT_SYMBOL(of_phy_register_fixed_link);
> diff --git a/include/linux/of_mdio.h b/include/linux/of_mdio.h
> index d449018..677adac 100644
> --- a/include/linux/of_mdio.h
> +++ b/include/linux/of_mdio.h
> @@ -65,6 +65,9 @@ static inline struct mii_bus *of_mdio_find_bus(struct device_node *mdio_np)
> #if defined(CONFIG_OF) && defined(CONFIG_FIXED_PHY)
> extern int of_phy_register_fixed_link(struct device_node *np);
> extern bool of_phy_is_fixed_link(struct device_node *np);
> +extern int of_phy_fixed_link_set_link(struct phy_device *phy, int link);
> +extern int of_phy_fixed_link_set_speed(struct phy_device *phy, int speed);
> +extern int of_phy_fixed_link_set_duplex(struct phy_device *phy, int duplex);
> #else
> static inline int of_phy_register_fixed_link(struct device_node *np)
> {
> @@ -74,6 +77,20 @@ static inline bool of_phy_is_fixed_link(struct device_node *np)
> {
> return false;
> }
> +static inline int of_phy_fixed_link_set_link(struct phy_device *phy, int link)
> +{
> + return -ENOSYS;
> +}
> +static inline int of_phy_fixed_link_set_speed(struct phy_device *phy,
> + int speed)
> +{
> + return -ENOSYS;
> +}
> +static inline int of_phy_fixed_link_set_duplex(struct phy_device *phy,
> + int duplex)
> +{
> + return -ENOSYS;
> +}
> #endif
>
>
> --
> 1.7.9.5
--
Florian
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