Re: [PATCH v6 1/2] hwmon: shtc1: add support for device tree bindings

[Chris Ruehl <chris.ruehl@gtsys.com.hk>]

On 12/7/2020 12:44 pm, 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>
> Reviewed-by: Guenter Roeck <linux@roeck-us.net>

Received new PCBA from the factory today, with the chip installed.
Probe working, the measurement of temperature and humidity is correct.

root@pcba0:~# cat 
/sys/devices/platform/ff110000.i2c/i2c-1/1-0070/hwmon/hwmon1/temp1_input
42334
root@pcba0:~# cat 
/sys/devices/platform/ff110000.i2c/i2c-1/1-0070/hwmon/hwmon1/humidity1_input
38128


Tested-by: Chris Ruehl <chris.ruehl@gtsys.com.hk>

> ---
>   drivers/hwmon/shtc1.c | 25 ++++++++++++++++++++++---
>   1 file changed, 22 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/hwmon/shtc1.c b/drivers/hwmon/shtc1.c
> index a0078ccede03..7993a5ff8768 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 +235,14 @@ static int shtc1_probe(struct i2c_client *client,
>   	data->client = client;
>   	data->chip = chip;
>   
> -	if (client->dev.platform_data)
> -		data->setup = *(struct shtc1_platform_data *)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");
> +	} 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 +265,19 @@ 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,
>   };
> 

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