phy: sparx5-serdes: add support for private match data

In order to reuse the existing Sparx5 SERDES driver for lan969x, we add
support for private match data, with initial fields for the iomap and
imap_size.

Signed-off-by: Daniel Machon <daniel.machon@microchip.com>
Reviewed-by: Steen Hegelund <Steen.Hegelund@microchip.com>
Link: https://lore.kernel.org/r/20240909-sparx5-lan969x-serdes-driver-v2-1-d695bcb57b84@microchip.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/microchip/sparx5_serdes.c

@@ -2507,6 +2507,11 @@ static struct sparx5_serdes_io_resource sparx5_serdes_iomap[] =  {
 	{ TARGET_SD_LANE_25G + 7, 0x5c8000 }, /* 0x610dd0000: sd_lane_25g_32 */
 };
 
+static const struct sparx5_serdes_match_data sparx5_desc = {
+	.iomap = sparx5_serdes_iomap,
+	.iomap_size = ARRAY_SIZE(sparx5_serdes_iomap),
+};
+
 /* Client lookup function, uses serdes index */
 static struct phy *sparx5_serdes_xlate(struct device *dev,
 				     const struct of_phandle_args *args)
@@ -2555,6 +2560,10 @@ static int sparx5_serdes_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, priv);
 	priv->dev = &pdev->dev;
 
+	priv->data = device_get_match_data(priv->dev);
+	if (!priv->data)
+		return -EINVAL;
+
 	/* Get coreclock */
 	clk = devm_clk_get(priv->dev, NULL);
 	if (IS_ERR(clk)) {
@@ -2579,8 +2588,9 @@ static int sparx5_serdes_probe(struct platform_device *pdev)
 			iores->name);
 		return -ENOMEM;
 	}
-	for (idx = 0; idx < ARRAY_SIZE(sparx5_serdes_iomap); idx++) {
-		struct sparx5_serdes_io_resource *iomap = &sparx5_serdes_iomap[idx];
+	for (idx = 0; idx < priv->data->iomap_size; idx++) {
+		const struct sparx5_serdes_io_resource *iomap =
+			&priv->data->iomap[idx];
 
 		priv->regs[iomap->id] = iomem + iomap->offset;
 	}
@@ -2599,7 +2609,7 @@ static int sparx5_serdes_probe(struct platform_device *pdev)
 }
 
 static const struct of_device_id sparx5_serdes_match[] = {
-	{ .compatible = "microchip,sparx5-serdes" },
+	{ .compatible = "microchip,sparx5-serdes", .data = &sparx5_desc },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, sparx5_serdes_match);

drivers/phy/microchip/sparx5_serdes.h

@@ -26,11 +26,17 @@ enum sparx5_serdes_mode {
 	SPX5_SD_MODE_SFI,
 };
 
+struct sparx5_serdes_match_data {
+	const struct sparx5_serdes_io_resource *iomap;
+	int iomap_size;
+};
+
 struct sparx5_serdes_private {
 	struct device *dev;
 	void __iomem *regs[NUM_TARGETS];
 	struct phy *phys[SPX5_SERDES_MAX];
 	unsigned long coreclock;
+	const struct sparx5_serdes_match_data *data;
 };
 
 struct sparx5_serdes_macro {