clk: lan966x: prepare driver for lan969x support

In preparation for lan969x support, add private match data for lan966x
and add variables for: peripheral clock names, clock gate names, number
of total clocks and number of generic clocks. Use the variables
throughout.

Signed-off-by: Daniel Machon <daniel.machon@microchip.com>
Link: https://lore.kernel.org/r/20240916-lan969x-clock-v1-3-0e150336074d@microchip.com
[claudiu.beznea: in lan966x_clk_probe(): keep struct_size() arguments on
 a single line]
Signed-off-by: Claudiu Beznea <claudiu.beznea@tuxon.dev>

Author: Danielmachon

drivers/clk/clk-lan966x.c

@@ -24,7 +24,7 @@
 
 #define DIV_MAX		255
 
-static const char * const clk_names[N_CLOCKS] = {
+static const char * const lan966x_clk_names[] = {
 	"qspi0", "qspi1", "qspi2", "sdmmc0",
 	"pi", "mcan0", "mcan1", "flexcom0",
 	"flexcom1", "flexcom2", "flexcom3",
@@ -53,14 +53,30 @@ struct clk_gate_soc_desc {
 	int bit_idx;
 };
 
-static const struct clk_gate_soc_desc clk_gate_desc[] = {
+static const struct clk_gate_soc_desc lan966x_clk_gate_desc[] = {
 	{ "uhphs", 11 },
 	{ "udphs", 10 },
 	{ "mcramc", 9 },
 	{ "hmatrix", 8 },
 	{ }
 };
 
+struct lan966x_match_data {
+	char *name;
+	const char * const *clk_name;
+	const struct clk_gate_soc_desc *clk_gate_desc;
+	u8 num_generic_clks;
+	u8 num_total_clks;
+};
+
+static struct lan966x_match_data lan966x_desc = {
+	.name = "lan966x",
+	.clk_name = lan966x_clk_names,
+	.clk_gate_desc = lan966x_clk_gate_desc,
+	.num_total_clks = 18,
+	.num_generic_clks = 14,
+};
+
 static DEFINE_SPINLOCK(clk_gate_lock);
 static void __iomem *base;
 
@@ -186,38 +202,45 @@ static struct clk_hw *lan966x_gck_clk_register(struct device *dev, int i)
 };
 
 static int lan966x_gate_clk_register(struct device *dev,
+				     const struct lan966x_match_data *data,
 				     struct clk_hw_onecell_data *hw_data,
 				     void __iomem *gate_base)
 {
-	int i;
+	for (int i = data->num_generic_clks; i < data->num_total_clks; ++i) {
+		int idx = i - data->num_generic_clks;
+		const struct clk_gate_soc_desc *desc;
 
-	for (i = GCK_GATE_UHPHS; i < N_CLOCKS; ++i) {
-		int idx = i - GCK_GATE_UHPHS;
+		desc = &data->clk_gate_desc[idx];
 
 		hw_data->hws[i] =
-			devm_clk_hw_register_gate(dev, clk_gate_desc[idx].name,
-						  "lan966x", 0, gate_base,
-						  clk_gate_desc[idx].bit_idx,
+			devm_clk_hw_register_gate(dev, desc->name,
+						  data->name, 0, gate_base,
+						  desc->bit_idx,
 						  0, &clk_gate_lock);
 
 		if (IS_ERR(hw_data->hws[i]))
 			return dev_err_probe(dev, PTR_ERR(hw_data->hws[i]),
 					     "failed to register %s clock\n",
-					     clk_gate_desc[idx].name);
+					     desc->name);
 	}
 
 	return 0;
 }
 
 static int lan966x_clk_probe(struct platform_device *pdev)
 {
+	const struct lan966x_match_data *data;
 	struct clk_hw_onecell_data *hw_data;
 	struct device *dev = &pdev->dev;
 	void __iomem *gate_base;
 	struct resource *res;
 	int i, ret;
 
-	hw_data = devm_kzalloc(dev, struct_size(hw_data, hws, N_CLOCKS),
+	data = device_get_match_data(dev);
+	if (!data)
+		return -EINVAL;
+
+	hw_data = devm_kzalloc(dev, struct_size(hw_data, hws, data->num_total_clks),
 			       GFP_KERNEL);
 	if (!hw_data)
 		return -ENOMEM;
@@ -228,10 +251,10 @@ static int lan966x_clk_probe(struct platform_device *pdev)
 
 	init.ops = &lan966x_gck_ops;
 
-	hw_data->num = GCK_GATE_UHPHS;
+	hw_data->num = data->num_generic_clks;
 
-	for (i = 0; i < GCK_GATE_UHPHS; i++) {
-		init.name = clk_names[i];
+	for (i = 0; i < data->num_generic_clks; i++) {
+		init.name = data->clk_name[i];
 		hw_data->hws[i] = lan966x_gck_clk_register(dev, i);
 		if (IS_ERR(hw_data->hws[i])) {
 			dev_err(dev, "failed to register %s clock\n",
@@ -246,9 +269,9 @@ static int lan966x_clk_probe(struct platform_device *pdev)
 		if (IS_ERR(gate_base))
 			return PTR_ERR(gate_base);
 
-		hw_data->num = N_CLOCKS;
+		hw_data->num = data->num_total_clks;
 
-		ret = lan966x_gate_clk_register(dev, hw_data, gate_base);
+		ret = lan966x_gate_clk_register(dev, data, hw_data, gate_base);
 		if (ret)
 			return ret;
 	}
@@ -257,7 +280,7 @@ static int lan966x_clk_probe(struct platform_device *pdev)
 }
 
 static const struct of_device_id lan966x_clk_dt_ids[] = {
-	{ .compatible = "microchip,lan966x-gck", },
+	{ .compatible = "microchip,lan966x-gck", .data = &lan966x_desc },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, lan966x_clk_dt_ids);