[v2,0/2] shtc1: add support for device tree bindings

Add support for DTS bindings to the shtc driver
The patches add the compatible table and of_property_read_bool to the
shtc1.c. Newly created Yaml document has been released to the
Documentation/devicetree/hwmon/sensirion,shtc1.yaml

Signed-off-by: Chris Ruehl <chris.ruehl@gtsys.com.hk>
---
 Version 2
	remove the #ifdef CONFIG_OF
	ignore platform data if dev->of_node is valid
	use boolean only therefor use sensirion,low_precise to fit the logic
	add missing driver.of_match_table entry
 Version 1
	initial version

On Sun, Jul 05, 2020 at 11:47:25AM +0800, Chris Ruehl wrote:
> Add support for DTS bindings for the sensirion shtc1,shtw1 and shtc3.
> 
> Signed-off-by: Chris Ruehl <chris.ruehl@gtsys.com.hk>
> ---
>  drivers/hwmon/shtc1.c | 22 ++++++++++++++++++++--
>  1 file changed, 20 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/hwmon/shtc1.c b/drivers/hwmon/shtc1.c
> index a0078ccede03..61e9275eb666 100644
> --- a/drivers/hwmon/shtc1.c
> +++ b/drivers/hwmon/shtc1.c
> @@ -14,6 +14,7 @@
>  #include <linux/err.h>
>  #include <linux/delay.h>
>  #include <linux/platform_data/shtc1.h>
> +#include <linux/of.h>
>  
>  /* commands (high precision mode) */
>  static const unsigned char shtc1_cmd_measure_blocking_hpm[]    = { 0x7C, 0xA2 };
> @@ -196,6 +197,7 @@ 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;
> +	struct device_node *np = dev->of_node;
>  
>  	if (!i2c_check_functionality(adap, I2C_FUNC_I2C)) {
>  		dev_err(dev, "plain i2c transactions not supported\n");
> @@ -233,8 +235,13 @@ static int shtc1_probe(struct i2c_client *client,
>  	data->client = client;
>  	data->chip = chip;
>  
> -	if (client->dev.platform_data)
> +	if (np) {
> +		data->setup.blocking_io = of_property_read_bool(np, "sensirion,blocking_io");
> +		data->setup.high_precision = of_property_read_bool(np, "sensicon,low_precision");

Just noticed. Presumably that would have to be:

		data->setup.high_precision = !of_property_read_bool(np, "sensicon,low_precision");

> +	}
> +	else if (client->dev.platform_data)
>  		data->setup = *(struct shtc1_platform_data *)dev->platform_data;
> +
>  	shtc1_select_command(data);
>  	mutex_init(&data->update_lock);
>  
> @@ -257,8 +264,19 @@ static const struct i2c_device_id shtc1_id[] = {
>  };
>  MODULE_DEVICE_TABLE(i2c, shtc1_id);
>  
> +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);
> +
>  static struct i2c_driver shtc1_i2c_driver = {
> -	.driver.name  = "shtc1",
> +	.driver = {
> +		.name = "shtc1",
> +		.of_match_table = shtc1_of_match,
> +	},
>  	.probe        = shtc1_probe,
>  	.id_table     = shtc1_id,
>  };