clk: tegra: dfll: Make code more comprehensible

Rename some variables and structure fields to make the code more
comprehensible. Also change the prototype of internal functions to be
more in line with the OPP core functions.

Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/clk/tegra/clk-tegra124-dfll-fcpu.c

@@ -47,7 +47,7 @@ static const struct cvb_table tegra124_cpu_cvb_tables[] = {
 		},
 		.speedo_scale = 100,
 		.voltage_scale = 1000,
-		.cvb_table = {
+		.entries = {
 			{204000000UL,   {1112619, -29295, 402} },
 			{306000000UL,	{1150460, -30585, 402} },
 			{408000000UL,	{1190122, -31865, 402} },
@@ -107,11 +107,10 @@ static int tegra124_dfll_fcpu_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	soc->cvb = tegra_cvb_build_opp_table(tegra124_cpu_cvb_tables,
-					     ARRAY_SIZE(tegra124_cpu_cvb_tables),
-					     process_id, speedo_id, speedo_value,
-					     cpu_max_freq_table[speedo_id],
-					     soc->dev);
+	soc->cvb = tegra_cvb_add_opp_table(soc->dev, tegra124_cpu_cvb_tables,
+					   ARRAY_SIZE(tegra124_cpu_cvb_tables),
+					   process_id, speedo_id, speedo_value,
+					   cpu_max_freq_table[speedo_id]);
 	if (IS_ERR(soc->cvb)) {
 		dev_err(&pdev->dev, "couldn't add OPP table: %ld\n",
 			PTR_ERR(soc->cvb));

drivers/clk/tegra/cvb.c

@@ -61,29 +61,28 @@ static int round_voltage(int mv, const struct rail_alignment *align, int up)
 	return mv;
 }
 
-static int build_opp_table(const struct cvb_table *d,
-			   int speedo_value,
-			   unsigned long max_freq,
-			   struct device *opp_dev)
+static int build_opp_table(struct device *dev, const struct cvb_table *table,
+			   int speedo_value, unsigned long max_freq)
 {
+	const struct rail_alignment *align = &table->alignment;
 	int i, ret, dfll_mv, min_mv, max_mv;
-	const struct cvb_table_freq_entry *table = NULL;
-	const struct rail_alignment *align = &d->alignment;
 
-	min_mv = round_voltage(d->min_millivolts, align, UP);
-	max_mv = round_voltage(d->max_millivolts, align, DOWN);
+	min_mv = round_voltage(table->min_millivolts, align, UP);
+	max_mv = round_voltage(table->max_millivolts, align, DOWN);
 
 	for (i = 0; i < MAX_DVFS_FREQS; i++) {
-		table = &d->cvb_table[i];
-		if (!table->freq || (table->freq > max_freq))
+		const struct cvb_table_freq_entry *entry = &table->entries[i];
+
+		if (!entry->freq || (entry->freq > max_freq))
 			break;
 
-		dfll_mv = get_cvb_voltage(
-			speedo_value, d->speedo_scale, &table->coefficients);
-		dfll_mv = round_cvb_voltage(dfll_mv, d->voltage_scale, align);
+		dfll_mv = get_cvb_voltage(speedo_value, table->speedo_scale,
+					  &entry->coefficients);
+		dfll_mv = round_cvb_voltage(dfll_mv, table->voltage_scale,
+					    align);
 		dfll_mv = clamp(dfll_mv, min_mv, max_mv);
 
-		ret = dev_pm_opp_add(opp_dev, table->freq, dfll_mv * 1000);
+		ret = dev_pm_opp_add(dev, entry->freq, dfll_mv * 1000);
 		if (ret)
 			return ret;
 	}
@@ -92,7 +91,7 @@ static int build_opp_table(const struct cvb_table *d,
 }
 
 /**
- * tegra_cvb_build_opp_table - build OPP table from Tegra CVB tables
+ * tegra_cvb_add_opp_table - build OPP table from Tegra CVB tables
  * @cvb_tables: array of CVB tables
  * @sz: size of the previously mentioned array
  * @process_id: process id of the HW module
@@ -108,25 +107,25 @@ static int build_opp_table(const struct cvb_table *d,
  * given @opp_dev. Returns a pointer to the struct cvb_table that matched
  * or an ERR_PTR on failure.
  */
-const struct cvb_table *tegra_cvb_build_opp_table(
-		const struct cvb_table *cvb_tables,
-		size_t sz, int process_id,
-		int speedo_id, int speedo_value,
-		unsigned long max_rate,
-		struct device *opp_dev)
+const struct cvb_table *
+tegra_cvb_add_opp_table(struct device *dev, const struct cvb_table *tables,
+			size_t count, int process_id, int speedo_id,
+			int speedo_value, unsigned long max_freq)
 {
-	int i, ret;
+	size_t i;
+	int ret;
 
-	for (i = 0; i < sz; i++) {
-		const struct cvb_table *d = &cvb_tables[i];
+	for (i = 0; i < count; i++) {
+		const struct cvb_table *table = &tables[i];
 
-		if (d->speedo_id != -1 && d->speedo_id != speedo_id)
+		if (table->speedo_id != -1 && table->speedo_id != speedo_id)
 			continue;
-		if (d->process_id != -1 && d->process_id != process_id)
+
+		if (table->process_id != -1 && table->process_id != process_id)
 			continue;
 
-		ret = build_opp_table(d, speedo_value, max_rate, opp_dev);
-		return ret ? ERR_PTR(ret) : d;
+		ret = build_opp_table(dev, table, speedo_value, max_freq);
+		return ret ? ERR_PTR(ret) : table;
 	}
 
 	return ERR_PTR(-EINVAL);

drivers/clk/tegra/cvb.h

@@ -53,15 +53,13 @@ struct cvb_table {
 
 	int speedo_scale;
 	int voltage_scale;
-	struct cvb_table_freq_entry cvb_table[MAX_DVFS_FREQS];
+	struct cvb_table_freq_entry entries[MAX_DVFS_FREQS];
 	struct cvb_cpu_dfll_data cpu_dfll_data;
 };
 
-const struct cvb_table *tegra_cvb_build_opp_table(
-		const struct cvb_table *cvb_tables,
-		size_t sz, int process_id,
-		int speedo_id, int speedo_value,
-		unsigned long max_rate,
-		struct device *opp_dev);
+const struct cvb_table *
+tegra_cvb_add_opp_table(struct device *dev, const struct cvb_table *cvb_tables,
+			size_t count, int process_id, int speedo_id,
+			int speedo_value, unsigned long max_freq);
 
 #endif