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Date: Fri, 28 Jun 2024 17:24:50 +0530
From: Naresh Solanki <naresh.solanki@...ements.com>
To: Jean Delvare <jdelvare@...e.com>,
Guenter Roeck <linux@...ck-us.net>
Cc: Naresh Solanki <naresh.solanki@...ements.com>,
linux-kernel@...r.kernel.org,
linux-hwmon@...r.kernel.org
Subject: [PATCH] hwmon: (max6639) : Add DT support
Remove platform data & add devicetree support.
Signed-off-by: Naresh Solanki <naresh.solanki@...ements.com>
---
drivers/hwmon/max6639.c | 99 ++++++++++++++++++++-------
include/linux/platform_data/max6639.h | 15 ----
2 files changed, 73 insertions(+), 41 deletions(-)
delete mode 100644 include/linux/platform_data/max6639.h
diff --git a/drivers/hwmon/max6639.c b/drivers/hwmon/max6639.c
index f54720d3d2ce..9ae7aecb0737 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>
@@ -81,6 +80,7 @@ struct max6639_data {
/* Register values initialized only once */
u8 ppr[MAX6639_NUM_CHANNELS]; /* Pulses per rotation 0..3 for 1..4 ppr */
u8 rpm_range[MAX6639_NUM_CHANNELS]; /* Index in above rpm_ranges table */
+ bool fan_enable[MAX6639_NUM_CHANNELS];
/* Optional regulator for FAN supply */
struct regulator *reg;
@@ -276,6 +276,11 @@ static int max6639_write_fan(struct device *dev, u32 attr, int channel,
static umode_t max6639_fan_is_visible(const void *_data, u32 attr, int channel)
{
+ struct max6639_data *data = (struct max6639_data *)_data;
+
+ if (!data->fan_enable[channel])
+ return 0;
+
switch (attr) {
case hwmon_fan_input:
case hwmon_fan_fault:
@@ -372,6 +377,11 @@ static int max6639_write_pwm(struct device *dev, u32 attr, int channel,
static umode_t max6639_pwm_is_visible(const void *_data, u32 attr, int channel)
{
+ struct max6639_data *data = (struct max6639_data *)_data;
+
+ if (!data->fan_enable[channel])
+ return 0;
+
switch (attr) {
case hwmon_pwm_input:
case hwmon_pwm_freq:
@@ -544,43 +554,85 @@ static int rpm_range_to_reg(int range)
int i;
for (i = 0; i < ARRAY_SIZE(rpm_ranges); i++) {
- if (rpm_ranges[i] == range)
+ if (range <= rpm_ranges[i])
return i;
}
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, val;
+ int err;
+
+ 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;
+ }
+
+ data->fan_enable[i] = true;
+
+ err = of_property_read_u32(child, "pulses-per-revolution", &val);
+
+ if (!err) {
+ if (val < 0 || 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);
if (err)
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] = ppr;
- data->ppr[1] = ppr;
+ for_each_child_of_node(np, child) {
+ if (strcmp(child->name, "fan"))
+ continue;
- 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;
+ 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++) {
+ if (!data->fan_enable[i])
+ err = regmap_set_bits(data->regmap, MAX6639_REG_OUTPUT_MASK, BIT(1 - i));
+ else
+ err = regmap_clear_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)
@@ -593,12 +645,7 @@ 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 */
base-commit: 52c1e818d66bfed276bd371f9e7947be4055af87
--
2.42.0
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