Re: [PATCH v2 3/4] iio: adc: Add support for the GE HealthCare PMC ADC

[David Lechner]

On 10/3/24 6:46 AM, Herve Codina wrote:
> The GE HealthCare PMC Analog to Digital Converter (ADC) is a 16-Channel
> (voltage and current), 16-Bit ADC with an I2C Interface.
> 
> Signed-off-by: Herve Codina <herve.codina@xxxxxxxxxxx>
> ---

...


> +
> +static int pmc_adc_probe(struct i2c_client *client)
> +{
> +	struct iio_dev *indio_dev;
> +	struct pmc_adc *pmc_adc;
> +	struct clk *clk;
> +	s32 val;
> +	int ret;
> +
> +	ret = devm_regulator_bulk_get_enable(&client->dev, ARRAY_SIZE(pmc_adc_regulator_names),
> +					     pmc_adc_regulator_names);
> +	if (ret)
> +		return dev_err_probe(&client->dev, ret, "Failed to get regulators\n");
> +
> +	clk = devm_clk_get_optional_enabled(&client->dev, "osc");
> +	if (IS_ERR(clk))
> +		return dev_err_probe(&client->dev, PTR_ERR(clk), "Failed to get osc clock\n");
> +
> +	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*pmc_adc));
> +	if (!indio_dev)
> +		return -ENOMEM;
> +
> +	pmc_adc = iio_priv(indio_dev);
> +	pmc_adc->client = client;
> +
> +	val = i2c_smbus_read_byte_data(pmc_adc->client, PMC_ADC_CMD_REQUEST_PROTOCOL_VERSION);
> +	if (val < 0)
> +		return dev_err_probe(&client->dev, val, "Failed to get protocol version\n");
> +
> +	if (val != 0x01)
> +		return dev_err_probe(&client->dev, -EINVAL,
> +				     "Unsupported protocol version 0x%02x\n", val);
> +
> +	indio_dev->name = "pmc_adc";
> +	indio_dev->info = &pmc_adc_info;
> +	indio_dev->channels = pmc_adc_channels;
> +	indio_dev->num_channels = ARRAY_SIZE(pmc_adc_channels);

I don't think the core code actually checks this, but for
correctness we should add:

	indio_dev->modes = INDIO_DIRECT_MODE;

> +
> +	return devm_iio_device_register(&client->dev, indio_dev);
> +}
> +

With that...

Reviewed-by: David Lechner <dlechner@xxxxxxxxxxxx>