[PATCH 3/3] hwmon: g672: add support for g761

Christian Marangi
2024-05-25T10:29:26Z

Add support for g761 PWM Fan Controller.

The g761 is a copy of the g763 with the only difference of supporting
and internal clock. This can be configured with the gmt,internal-clock
property and in such case clock handling is skipped.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
drivers/hwmon/g762.c | 23 ++++++++++++++++++++---
1 file changed, 20 insertions(+), 3 deletions(-)

diff --git a/drivers/hwmon/g762.c b/drivers/hwmon/g762.c
index af1228708e25..1629a3141c11 100644
--- a/drivers/hwmon/g762.c
+++ b/drivers/hwmon/g762.c
@@ -69,6 +69,7 @@ enum g762_regs {
#define G762_REG_FAN_CMD1_PWM_POLARITY 0x02 /* PWM polarity */
#define G762_REG_FAN_CMD1_PULSE_PER_REV 0x01 /* pulse per fan revolution */

+#define G761_REG_FAN_CMD2_FAN_CLOCK 0x20 /* choose internal clock*/
#define G762_REG_FAN_CMD2_GEAR_MODE_1 0x08 /* fan gear mode */
#define G762_REG_FAN_CMD2_GEAR_MODE_0 0x04
#define G762_REG_FAN_CMD2_FAN_STARTV_1 0x02 /* fan startup voltage */
@@ -115,6 +116,7 @@ enum g762_regs {

struct g762_data {
struct i2c_client *client;
+ bool internal_clock;
struct clk *clk;

/* update mutex */
@@ -566,6 +568,7 @@ static int do_set_fan_startv(struct device *dev, unsigned long val)

#ifdef CONFIG_OF
static const struct of_device_id g762_dt_match[] = {
+ { .compatible = "gmt,g761" },
{ .compatible = "gmt,g762" },
{ .compatible = "gmt,g763" },
{ },
@@ -597,6 +600,16 @@ static int g762_of_clock_enable(struct i2c_client *client)
if (!client->dev.of_node)
return 0;

+ data = i2c_get_clientdata(client);
+
+ /* Skip CLK detection and handling if we use internal clock */
+ data->internal_clock = of_property_read_bool(client->dev.of_node,
+ "gmt,internal-clock");
+ if (data->internal_clock) {
+ do_set_clk_freq(&client->dev, 32768);
+ return 0;
+ }
+
clk = of_clk_get(client->dev.of_node, 0);
if (IS_ERR(clk)) {
dev_err(&client->dev, "failed to get clock\n");
@@ -616,7 +629,6 @@ static int g762_of_clock_enable(struct i2c_client *client)
goto clk_unprep;
}

- data = i2c_get_clientdata(client);
data->clk = clk;

ret = devm_add_action(&client->dev, g762_of_clock_disable, data);
@@ -1029,12 +1041,17 @@ static inline int g762_fan_init(struct device *dev)
if (IS_ERR(data))
return PTR_ERR(data);

+ if (data->internal_clock)
+ data->fan_cmd2 |= G761_REG_FAN_CMD2_FAN_CLOCK;
+
data->fan_cmd1 |= G762_REG_FAN_CMD1_DET_FAN_FAIL;
data->fan_cmd1 |= G762_REG_FAN_CMD1_DET_FAN_OOC;
data->valid = false;

- return i2c_smbus_write_byte_data(data->client, G762_REG_FAN_CMD1,
- data->fan_cmd1);
+ return (i2c_smbus_write_byte_data(data->client, G762_REG_FAN_CMD1,
+ data->fan_cmd1) |
+ i2c_smbus_write_byte_data(data->client, G762_REG_FAN_CMD2,
+ data->fan_cmd2));
}

static int g762_probe(struct i2c_client *client)
--
2.43.0