hwmon: (sht15) Add device tree support

Allow the driver to work with device tree support.

Based on initial patch submission from Peter Fox.

Tested on a imx7d-sdb board connected to a SHT15 board via Mikro Bus.

Signed-off-by: Marco Franchi <marco.franchi@nxp.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

2 files changed, 79 insertions, 4 deletions

diff --git a/Documentation/devicetree/bindings/hwmon/sht15.txt b/Documentation/devicetree/bindings/hwmon/sht15.txt
new file mode 100644
index 000000000000..6a80277cc426
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/sht15.txt
@@ -0,0 +1,19 @@
+Sensirion SHT15 Humidity and Temperature Sensor
+
+Required properties:
+
+ - "compatible": must be "sensirion,sht15".
+ - "data-gpios": GPIO connected to the data line.
+ - "clk-gpios": GPIO connected to the clock line.
+ - "vcc-supply": regulator that drives the VCC pin.
+
+Example:
+
+        sensor {
+                pinctrl-names = "default";
+                pinctrl-0 = <&pinctrl_sensor>;
+                compatible = "sensirion,sht15";
+                clk-gpios = <&gpio4 12 0>;
+                data-gpios = <&gpio4 13 0>;
+                vcc-supply = <&reg_sht15>;
+        };
diff --git a/drivers/hwmon/sht15.c b/drivers/hwmon/sht15.c
index f16687c64fc8..e4d642b673c6 100644
--- a/drivers/hwmon/sht15.c
+++ b/drivers/hwmon/sht15.c
@@ -34,6 +34,7 @@
 #include <linux/slab.h>
 #include <linux/atomic.h>
 #include <linux/bitrev.h>
+#include <linux/of_gpio.h>
 
 /* Commands */
 #define SHT15_MEASURE_TEMP              0x03
@@ -911,6 +912,54 @@ static int sht15_invalidate_voltage(struct notifier_block *nb,
         return NOTIFY_OK;
 }
 
+#ifdef CONFIG_OF
+static const struct of_device_id sht15_dt_match[] = {
+        { .compatible = "sensirion,sht15" },
+        { },
+};
+MODULE_DEVICE_TABLE(of, sht15_dt_match);
+
+/*
+ * This function returns NULL if pdev isn't a device instatiated by dt,
+ * a pointer to pdata if it could successfully get all information
+ * from dt or a negative ERR_PTR() on error.
+ */
+static struct sht15_platform_data *sht15_probe_dt(struct device *dev)
+{
+        struct device_node *np = dev->of_node;
+        struct sht15_platform_data *pdata;
+
+        /* no device tree device */
+        if (!np)
+                return NULL;
+
+        pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+        if (!pdata)
+                return ERR_PTR(-ENOMEM);
+
+        pdata->gpio_data = of_get_named_gpio(np, "data-gpios", 0);
+        if (pdata->gpio_data < 0) {
+                if (pdata->gpio_data != -EPROBE_DEFER)
+                        dev_err(dev, "data-gpios not found\n");
+                return ERR_PTR(pdata->gpio_data);
+        }
+
+        pdata->gpio_sck = of_get_named_gpio(np, "clk-gpios", 0);
+        if (pdata->gpio_sck < 0) {
+                if (pdata->gpio_sck != -EPROBE_DEFER)
+                        dev_err(dev, "clk-gpios not found\n");
+                return ERR_PTR(pdata->gpio_sck);
+        }
+
+        return pdata;
+}
+#else
+static inline struct sht15_platform_data *sht15_probe_dt(struct device *dev)
+{
+        return NULL;
+}
+#endif
+
 static int sht15_probe(struct platform_device *pdev)
 {
         int ret;
@@ -928,11 +977,17 @@ static int sht15_probe(struct platform_device *pdev)
         data->dev = &pdev->dev;
         init_waitqueue_head(&data->wait_queue);
 
-        if (dev_get_platdata(&pdev->dev) == NULL) {
-                dev_err(&pdev->dev, "no platform data supplied\n");
-                return -EINVAL;
+        data->pdata = sht15_probe_dt(&pdev->dev);
+        if (IS_ERR(data->pdata))
+                return PTR_ERR(data->pdata);
+        if (data->pdata == NULL) {
+                data->pdata = dev_get_platdata(&pdev->dev);
+                if (data->pdata == NULL) {
+                        dev_err(&pdev->dev, "no platform data supplied\n");
+                        return -EINVAL;
+                }
         }
-        data->pdata = dev_get_platdata(&pdev->dev);
+
         data->supply_uv = data->pdata->supply_mv * 1000;
         if (data->pdata->checksum)
                 data->checksumming = true;
@@ -1075,6 +1130,7 @@ MODULE_DEVICE_TABLE(platform, sht15_device_ids);
 static struct platform_driver sht15_driver = {
         .driver = {
                 .name = "sht15",
+                .of_match_table = of_match_ptr(sht15_dt_match),
         },
         .probe = sht15_probe,
         .remove = sht15_remove,