Re: [PATCH net-next v5 4/7] net: stmmac: introduce pcs_init/pcs_exit stmmac operations

[Serge Semin]

On Tue, Apr 30, 2024 at 09:29:44AM +0200, Romain Gantois wrote:
> From: "Russell King (Oracle)" <rmk+kernel@xxxxxxxxxxxxxxx>
> 
> Introduce a mechanism whereby platforms can create their PCS instances
> prior to the network device being published to userspace, but after
> some of the core stmmac initialisation has been completed. This means
> that the data structures that platforms need will be available.
> 
> Signed-off-by: Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx>
> Reviewed-by: Maxime Chevallier <maxime.chevallier@xxxxxxxxxxx>
> Co-developed-by: Romain Gantois <romain.gantois@xxxxxxxxxxx>
> Signed-off-by: Romain Gantois <romain.gantois@xxxxxxxxxxx>

Reviewed-by: Serge Semin <fancer.lancer@xxxxxxxxx>

-Serge(y)

> ---
>  drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c | 8 +++++++-
>  include/linux/stmmac.h                            | 2 ++
>  2 files changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
> index af8ad9768da10..1c788caea0cfb 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
> @@ -505,7 +505,10 @@ int stmmac_pcs_setup(struct net_device *ndev)
>  	priv = netdev_priv(ndev);
>  	mode = priv->plat->phy_interface;
>  
> -	if (priv->plat->mdio_bus_data && priv->plat->mdio_bus_data->has_xpcs) {
> +	if (priv->plat->pcs_init) {
> +		ret = priv->plat->pcs_init(priv);
> +	} else if (priv->plat->mdio_bus_data &&
> +		   priv->plat->mdio_bus_data->has_xpcs) {
>  		/* Try to probe the XPCS by scanning all addresses */
>  		for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
>  			xpcs = xpcs_create_mdiodev(priv->mii, addr, mode);
> @@ -531,6 +534,9 @@ int stmmac_pcs_setup(struct net_device *ndev)
>  
>  void stmmac_pcs_clean(struct stmmac_priv *priv)
>  {
> +	if (priv->plat->pcs_exit)
> +		priv->plat->pcs_exit(priv);
> +
>  	if (!priv->hw->xpcs)
>  		return;
>  
> diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
> index dfa1828cd756a..4a24a246c617d 100644
> --- a/include/linux/stmmac.h
> +++ b/include/linux/stmmac.h
> @@ -285,6 +285,8 @@ struct plat_stmmacenet_data {
>  	int (*crosststamp)(ktime_t *device, struct system_counterval_t *system,
>  			   void *ctx);
>  	void (*dump_debug_regs)(void *priv);
> +	int (*pcs_init)(struct stmmac_priv *priv);
> +	void (*pcs_exit)(struct stmmac_priv *priv);
>  	void *bsp_priv;
>  	struct clk *stmmac_clk;
>  	struct clk *pclk;
> 
> -- 
> 2.44.0
>