net: dsa: realtek: keep variant reference in realtek_priv

Instead of copying values from the variant, we can keep a reference in
realtek_priv.

This is a preliminary change for sharing code betwen interfaces. It will
allow to move most of the probe into a common module while still allow
code specific to each interface to read variant fields.
Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/realtek/realtek-mdio.c

@@ -196,9 +196,7 @@ int realtek_mdio_probe(struct mdio_device *mdiodev)
 	priv->dev = &mdiodev->dev;
 	priv->chip_data = (void *)priv + sizeof(*priv);
 
-	priv->clk_delay = var->clk_delay;
-	priv->cmd_read = var->cmd_read;
-	priv->cmd_write = var->cmd_write;
+	priv->variant = var;
 	priv->ops = var->ops;
 
 	priv->write_reg_noack = realtek_mdio_write;

drivers/net/dsa/realtek/realtek-smi.c

@@ -46,7 +46,7 @@
 
 static inline void realtek_smi_clk_delay(struct realtek_priv *priv)
 {
-	ndelay(priv->clk_delay);
+	ndelay(priv->variant->clk_delay);
 }
 
 static void realtek_smi_start(struct realtek_priv *priv)
@@ -209,7 +209,7 @@ static int realtek_smi_read_reg(struct realtek_priv *priv, u32 addr, u32 *data)
 	realtek_smi_start(priv);
 
 	/* Send READ command */
-	ret = realtek_smi_write_byte(priv, priv->cmd_read);
+	ret = realtek_smi_write_byte(priv, priv->variant->cmd_read);
 	if (ret)
 		goto out;
 
@@ -250,7 +250,7 @@ static int realtek_smi_write_reg(struct realtek_priv *priv,
 	realtek_smi_start(priv);
 
 	/* Send WRITE command */
-	ret = realtek_smi_write_byte(priv, priv->cmd_write);
+	ret = realtek_smi_write_byte(priv, priv->variant->cmd_write);
 	if (ret)
 		goto out;
 
@@ -459,9 +459,7 @@ int realtek_smi_probe(struct platform_device *pdev)
 
 	/* Link forward and backward */
 	priv->dev = dev;
-	priv->clk_delay = var->clk_delay;
-	priv->cmd_read = var->cmd_read;
-	priv->cmd_write = var->cmd_write;
+	priv->variant = var;
 	priv->ops = var->ops;
 
 	priv->setup_interface = realtek_smi_setup_mdio;

drivers/net/dsa/realtek/realtek.h

@@ -58,9 +58,8 @@ struct realtek_priv {
 	struct mii_bus		*bus;
 	int			mdio_addr;
 
-	unsigned int		clk_delay;
-	u8			cmd_read;
-	u8			cmd_write;
+	const struct realtek_variant *variant;
+
 	spinlock_t		lock; /* Locks around command writes */
 	struct dsa_switch	*ds;
 	struct irq_domain	*irqdomain;