From: Chanh Nguyen <chanh@os.amperecomputing.com>
To: Jean Delvare <jdelvare@suse.com>,
Guenter Roeck <linux@roeck-us.net>,
Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Conor Dooley <conor+dt@kernel.org>,
Justin Ledford <justinledford@google.com>,
devicetree@vger.kernel.org, linux-hwmon@vger.kernel.org,
linux-kernel@vger.kernel.org,
OpenBMC Maillist <openbmc@lists.ozlabs.org>,
Open Source Submission <patches@amperecomputing.com>
Cc: Phong Vo <phong@os.amperecomputing.com>,
Thang Nguyen <thang@os.amperecomputing.com>,
Quan Nguyen <quan@os.amperecomputing.com>,
Chanh Nguyen <chanh@os.amperecomputing.com>
Subject: [PATCH v2 2/3] hwmon: (max31790): Support config PWM output becomes TACH
Date: Sun, 14 Apr 2024 11:22:45 +0700 [thread overview]
Message-ID: <20240414042246.8681-3-chanh@os.amperecomputing.com> (raw)
In-Reply-To: <20240414042246.8681-1-chanh@os.amperecomputing.com>
PWMOUT pins on MAX31790 can be configured as a tachometer input pin by
setting bit[0] in the Configuration Register. When the bit[0] of a channel
is set, the PWMOUT pin becomes the tach input pin for the channel plus six.
This commit allows the kernel to set those pins when necessary if the
maxim,pwmout-pin-as-tach-input DT property exists.
Signed-off-by: Chanh Nguyen <chanh@os.amperecomputing.com>
---
Changes in v2:
- Update the vendor property name to "maxim,pwmout-pin-as-tach-input" [Rob]
---
drivers/hwmon/max31790.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c
index 3dc95196b229..ac0a8099acf6 100644
--- a/drivers/hwmon/max31790.c
+++ b/drivers/hwmon/max31790.c
@@ -12,6 +12,7 @@
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/module.h>
+#include <linux/property.h>
#include <linux/slab.h>
/* MAX31790 registers */
@@ -506,9 +507,12 @@ static int max31790_probe(struct i2c_client *client)
{
struct i2c_adapter *adapter = client->adapter;
struct device *dev = &client->dev;
+ u8 pwmout_to_tach[NR_CHANNEL];
struct max31790_data *data;
struct device *hwmon_dev;
int err;
+ u8 tmp;
+ int i;
if (!i2c_check_functionality(adapter,
I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
@@ -528,6 +532,33 @@ static int max31790_probe(struct i2c_client *client)
if (err)
return err;
+ if (device_property_present(dev, "maxim,pwmout-pin-as-tach-input")) {
+ err = device_property_read_u8_array(dev, "maxim,pwmout-pin-as-tach-input",
+ pwmout_to_tach, NR_CHANNEL);
+ if (err) {
+ /* The maxim,pwmout-pin-as-tach-input is an array of six values */
+ dev_warn(dev, "The maxim,pwmout-pin-as-tach-input property exist but malform");
+ } else {
+ for (i = 0; i < NR_CHANNEL; i++) {
+ tmp = data->fan_config[i];
+ if (pwmout_to_tach[i])
+ data->fan_config[i] |= MAX31790_FAN_CFG_TACH_INPUT;
+ else
+ data->fan_config[i] &= ~(MAX31790_FAN_CFG_TACH_INPUT);
+
+ if (tmp != data->fan_config[i]) {
+ err = i2c_smbus_write_byte_data(client,
+ MAX31790_REG_FAN_CONFIG(i),
+ data->fan_config[i]);
+ if (err < 0)
+ dev_warn(dev,
+ "Fail to apply fan configuration at channel %d",
+ i);
+ }
+ }
+ }
+ }
+
hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
data,
&max31790_chip_info,
--
2.17.1
next prev parent reply other threads:[~2024-04-14 4:23 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-14 4:22 [PATCH v2 0/3] Update the max31790 driver Chanh Nguyen
2024-04-14 4:22 ` [PATCH v2 1/3] dt-bindings: hwmon: Add maxim max31790 bindings Chanh Nguyen
2024-04-14 6:03 ` Krzysztof Kozlowski
2024-04-16 4:38 ` Chanh Nguyen
2024-04-14 4:22 ` Chanh Nguyen [this message]
2024-04-14 8:03 ` [PATCH v2 2/3] hwmon: (max31790): Support config PWM output becomes TACH Christophe JAILLET
2024-04-16 5:27 ` Chanh Nguyen
2024-04-16 17:39 ` Christophe JAILLET
2024-04-17 2:54 ` Chanh Nguyen
2024-04-14 4:22 ` [PATCH v2 3/3] dt-bindings: hwmon: max31790: Add maxim,pwmout-pin-as-tach-input property Chanh Nguyen
2024-04-14 6:07 ` Krzysztof Kozlowski
2024-04-16 4:52 ` Chanh Nguyen
2024-04-23 8:45 ` Chanh Nguyen
2024-04-23 17:02 ` Conor Dooley
2024-04-25 10:33 ` Chanh Nguyen
2024-04-25 14:05 ` Guenter Roeck
2024-04-25 15:46 ` Krzysztof Kozlowski
2024-04-25 15:56 ` Conor Dooley
2024-05-05 10:08 ` Chanh Nguyen
2024-05-05 15:40 ` Guenter Roeck
2024-05-08 3:44 ` Chanh Nguyen
2024-05-08 16:47 ` Conor Dooley
2024-06-07 16:47 ` Chanh Nguyen
2024-06-07 23:14 ` Guenter Roeck
2024-06-08 8:32 ` Chanh Nguyen
2024-05-09 8:29 ` Krzysztof Kozlowski
2024-06-07 16:46 ` Chanh Nguyen
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