linux-kernel - [PATCH 1/2] hwmon: shtc1: add support for device tree bindings

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Message-Id: <20200703034856.12846-2-chris.ruehl@gtsys.com.hk>
Date:   Fri,  3 Jul 2020 11:48:54 +0800
From:   Chris Ruehl <chris.ruehl@...ys.com.hk>
To:     Chris Ruehl <chris.ruehl@...ys.com.hk>
Cc:     Jack Lo <jack.lo@...ys.com.hk>, devicetree@...r.kernel.org,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] hwmon: shtc1: add support for device tree bindings

Add support for DTS bindings to the shtc driver, use CONFIG_OF
to compile in the code if needed.

Signed-off-by: Chris Ruehl <chris.ruehl@...ys.com.hk>
---
 drivers/hwmon/shtc1.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/hwmon/shtc1.c b/drivers/hwmon/shtc1.c
index a0078ccede03..3bcabc1cbce8 100644
--- a/drivers/hwmon/shtc1.c
+++ b/drivers/hwmon/shtc1.c
@@ -14,6 +14,9 @@
 #include <linux/err.h>
 #include <linux/delay.h>
 #include <linux/platform_data/shtc1.h>
+#ifdef CONFIG_OF
+#include <linux/of.h>
+#endif
 
 /* commands (high precision mode) */
 static const unsigned char shtc1_cmd_measure_blocking_hpm[]    = { 0x7C, 0xA2 };
@@ -196,6 +199,10 @@ static int shtc1_probe(struct i2c_client *client,
 	enum shtcx_chips chip = id->driver_data;
 	struct i2c_adapter *adap = client->adapter;
 	struct device *dev = &client->dev;
+#ifdef CONFIG_OF
+	struct device_node *np = dev->of_node;
+	u8 value;
+#endif
 
 	if (!i2c_check_functionality(adap, I2C_FUNC_I2C)) {
 		dev_err(dev, "plain i2c transactions not supported\n");
@@ -235,6 +242,20 @@ static int shtc1_probe(struct i2c_client *client,
 
 	if (client->dev.platform_data)
 		data->setup = *(struct shtc1_platform_data *)dev->platform_data;
+
+#ifdef CONFIG_OF
+	if (np) {
+		if (of_property_read_bool(np, "sensirion,blocking_io")) {
+			of_property_read_u8(np, "sensirion,blocking_io", &value);
+			data->setup.blocking_io = (value > 0) ? true : false;
+		}
+		if (of_property_read_bool(np, "sensicon,high_precision")) {
+			of_property_read_u8(np, "sensirion,high_precision", &value);
+			data->setup.high_precision = (value > 0) ? true : false;
+		}
+	}
+#endif
+
 	shtc1_select_command(data);
 	mutex_init(&data->update_lock);
 
@@ -257,6 +278,15 @@ static const struct i2c_device_id shtc1_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, shtc1_id);
 
+#ifdef CONFIG_OF
+static const struct of_device_id shtc1_of_match[] = {
+	{ .compatible = "sensirion,shtc1" },
+	{ .compatible = "sensirion,shtw1" },
+	{ .compatible = "sensirion,shtc3" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, shtc1_of_match);
+#endif
 static struct i2c_driver shtc1_i2c_driver = {
 	.driver.name  = "shtc1",
 	.probe        = shtc1_probe,
-- 
2.20.1