[RESEND PATCH v2] hwmon: (max6639) : Configure based on DT property

[Naresh Solanki <naresh.solanki@xxxxxxxxxxxxx>]

Remove platform data & initialize with defaults
configuration & overwrite based on DT properties.

Signed-off-by: Naresh Solanki <naresh.solanki@xxxxxxxxxxxxx>
---
Changes in V2:
- Allow initializing the driver with defaults & overrid based on DT
  properties if specified.
- Remove unrelated changes.
- Optimise ppr check to remove unacceptable range.
---
 drivers/hwmon/max6639.c               | 85 +++++++++++++++++++--------
 include/linux/platform_data/max6639.h | 15 -----
 2 files changed, 62 insertions(+), 38 deletions(-)
 delete mode 100644 include/linux/platform_data/max6639.h

diff --git a/drivers/hwmon/max6639.c b/drivers/hwmon/max6639.c
index c955b0f3a8d3..6eacb5aed96d 100644
--- a/drivers/hwmon/max6639.c
+++ b/drivers/hwmon/max6639.c
@@ -19,7 +19,6 @@
 #include <linux/hwmon-sysfs.h>
 #include <linux/err.h>
 #include <linux/mutex.h>
-#include <linux/platform_data/max6639.h>
 #include <linux/regmap.h>
 #include <linux/util_macros.h>
 
@@ -531,14 +530,51 @@ static int rpm_range_to_reg(int range)
 	return 1; /* default: 4000 RPM */
 }
 
+static int max6639_probe_child_from_dt(struct i2c_client *client,
+				       struct device_node *child,
+				       struct max6639_data *data)
+
+{
+	struct device *dev = &client->dev;
+	u32 i;
+	int err, val;
+
+	err = of_property_read_u32(child, "reg", &i);
+	if (err) {
+		dev_err(dev, "missing reg property of %pOFn\n", child);
+		return err;
+	}
+
+	if (i > 1) {
+		dev_err(dev, "Invalid fan index reg %d\n", i);
+		return -EINVAL;
+	}
+
+	err = of_property_read_u32(child, "pulses-per-revolution", &val);
+
+	if (!err) {
+		if (val < 1 || val > 5) {
+			dev_err(dev, "invalid pulses-per-revolution %d of %pOFn\n", val, child);
+			return -EINVAL;
+		}
+		data->ppr[i] = val;
+	}
+
+	err = of_property_read_u32(child, "max-rpm", &val);
+
+	if (!err)
+		data->rpm_range[i] = rpm_range_to_reg(val);
+
+	return 0;
+}
+
 static int max6639_init_client(struct i2c_client *client,
 			       struct max6639_data *data)
 {
-	struct max6639_platform_data *max6639_info =
-		dev_get_platdata(&client->dev);
-	int i;
-	int rpm_range = 1; /* default: 4000 RPM */
-	int err, ppr;
+	struct device *dev = &client->dev;
+	const struct device_node *np = dev->of_node;
+	struct device_node *child;
+	int i, err;
 
 	/* Reset chip to default values, see below for GCONFIG setup */
 	err = regmap_write(data->regmap, MAX6639_REG_GCONFIG, MAX6639_GCONFIG_POR);
@@ -546,21 +582,29 @@ static int max6639_init_client(struct i2c_client *client,
 		return err;
 
 	/* Fans pulse per revolution is 2 by default */
-	if (max6639_info && max6639_info->ppr > 0 &&
-			max6639_info->ppr < 5)
-		ppr = max6639_info->ppr;
-	else
-		ppr = 2;
+	data->ppr[0] = 2;
+	data->ppr[1] = 2;
 
-	data->ppr[0] = ppr;
-	data->ppr[1] = ppr;
+	/* default: 4000 RPM */
+	data->rpm_range[0] = 1;
+	data->rpm_range[1] = 1;
 
-	if (max6639_info)
-		rpm_range = rpm_range_to_reg(max6639_info->rpm_range);
-	data->rpm_range[0] = rpm_range;
-	data->rpm_range[1] = rpm_range;
+	for_each_child_of_node(np, child) {
+		if (strcmp(child->name, "fan"))
+			continue;
+
+		err = max6639_probe_child_from_dt(client, child, data);
+		if (err) {
+			of_node_put(child);
+			return err;
+		}
+	}
 
 	for (i = 0; i < MAX6639_NUM_CHANNELS; i++) {
+		err = regmap_set_bits(data->regmap, MAX6639_REG_OUTPUT_MASK, BIT(1 - i));
+		if (err)
+			return err;
+
 		/* Set Fan pulse per revolution */
 		err = max6639_set_ppr(data, i, data->ppr[i]);
 		if (err)
@@ -573,12 +617,7 @@ static int max6639_init_client(struct i2c_client *client,
 			return err;
 
 		/* Fans PWM polarity high by default */
-		if (max6639_info) {
-			if (max6639_info->pwm_polarity == 0)
-				err = regmap_write(data->regmap, MAX6639_REG_FAN_CONFIG2a(i), 0x00);
-			else
-				err = regmap_write(data->regmap, MAX6639_REG_FAN_CONFIG2a(i), 0x02);
-		}
+		err = regmap_write(data->regmap, MAX6639_REG_FAN_CONFIG2a(i), 0x00);
 		if (err)
 			return err;
 
diff --git a/include/linux/platform_data/max6639.h b/include/linux/platform_data/max6639.h
deleted file mode 100644
index 65bfdb4fdc15..000000000000
--- a/include/linux/platform_data/max6639.h
+++ /dev/null
@@ -1,15 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_MAX6639_H
-#define _LINUX_MAX6639_H
-
-#include <linux/types.h>
-
-/* platform data for the MAX6639 temperature sensor and fan control */
-
-struct max6639_platform_data {
-	bool pwm_polarity;	/* Polarity low (0) or high (1, default) */
-	int ppr;		/* Pulses per rotation 1..4 (default == 2) */
-	int rpm_range;		/* 2000, 4000 (default), 8000 or 16000 */
-};
-
-#endif /* _LINUX_MAX6639_H */
-- 
2.42.0