The ds2482-101 version of the chip has an active-low sleep pin. Add this as a
gpio to the probe function and describe the DT binding accordingly.
If the pin wouldn't be added and pulled high, the device would not be able to
be probed.
Signed-off-by: Steffen Trumtrar <s.trumtrar@xxxxxxxxxxxxxx>
---
Documentation/devicetree/bindings/w1/ds2482.txt | 18 ++++++++++++++++++
drivers/w1/masters/ds2482.c | 9 +++++++++
2 files changed, 27 insertions(+)
create mode 100644 Documentation/devicetree/bindings/w1/ds2482.txt
diff --git a/Documentation/devicetree/bindings/w1/ds2482.txt b/Documentation/devicetree/bindings/w1/ds2482.txt
new file mode 100644
index 0000000..e065207
--- /dev/null
+++ b/Documentation/devicetree/bindings/w1/ds2482.txt
@@ -0,0 +1,18 @@
+ds2482 devicetree bindings
+
+Required properties:
+
+ - compatible: "dallas,ds2482"
+
+Optional properties:
+
+ - sleep-gpios: if specified, the ds2482 has a low-active sleep-pin (ds2482-101).
+
+Example:
+
+ 1wire@18 {
+ compatible = "dallas,ds2482";
+ reg = <0x18>;
+ sleep-gpios = <&gpio4 2 0>;
+ };
+
diff --git a/drivers/w1/masters/ds2482.c b/drivers/w1/masters/ds2482.c
index e033491..b6b6024 100644
--- a/drivers/w1/masters/ds2482.c
+++ b/drivers/w1/masters/ds2482.c
@@ -18,6 +18,7 @@
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
#include <asm/delay.h>
#include "../w1.h"
@@ -128,6 +129,7 @@ struct ds2482_data {
u8 channel;
u8 read_prt; /* see DS2482_PTR_CODE_xxx */
u8 reg_config;
+ struct gpio_desc *slpz_gpio;
};
@@ -449,6 +451,7 @@ static int ds2482_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct ds2482_data *data;
+ struct gpio_desc *gpio;
int err = -ENODEV;
int temp1;
int idx;
@@ -466,6 +469,12 @@ static int ds2482_probe(struct i2c_client *client,
data->client = client;
i2c_set_clientdata(client, data);
+ gpio = devm_gpiod_get(&client->dev, "sleep");
+ if (!IS_ERR(gpio)) {
+ data->slpz_gpio = gpio;
+ gpiod_direction_output(data->slpz_gpio, 1);
+ }
+
/* Reset the device (sets the read_ptr to status) */
if (ds2482_send_cmd(data, DS2482_CMD_RESET) < 0) {
dev_warn(&client->dev, "DS2482 reset failed.\n");
--
2.0.0
--
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