Re: [PATCH v4 2/2] iio: dac: support the ad8460 Waveform DAC

[Christophe JAILLET]

Le 12/09/2024 à 11:54, Mariel Tinaco a écrit :
> The AD8460 is a “bits in, power out” high voltage, high-power,
> high-speed driver optimized for large output current (up to ±1 A)
> and high slew rate (up to ±1800 V/μs) at high voltage (up to ±40 V)
> into capacitive loads.
>
> A digital engine implements user-configurable features: modes for
> digital input, programmable supply current, and fault monitoring
> and programmable protection settings for output current,
> output voltage, and junction temperature. The AD8460 operates on
> high voltage dual supplies up to ±55 V and a single low voltage
> supply of 5 V.
>
> Signed-off-by: Mariel Tinaco <Mariel.Tinaco-OyLXuOCK7orQT0dZR+AlfA@xxxxxxxxxxxxxxxx>
> ---

Hi,

...

> +#define AD8460_CHAN_EXT_INFO(_name, _what, _read, _write) {		\
> +	.name = _name,							\
> +	.read = (_read),						\
> +	.write = (_write),						\
> +	.private = (_what),						\

Why () for _read, _write, _what?
(or why no () for _name?)

> +	.shared = IIO_SEPARATE,						\
> +}
> +
> +static struct iio_chan_spec_ext_info ad8460_ext_info[] = {

I think this can be static const struct.

> +	AD8460_CHAN_EXT_INFO("raw0", 0, ad8460_dac_input_read,
> +			     ad8460_dac_input_write),
> +	AD8460_CHAN_EXT_INFO("raw1", 1, ad8460_dac_input_read,
> +			     ad8460_dac_input_write),
> +	AD8460_CHAN_EXT_INFO("raw2", 2, ad8460_dac_input_read,
> +			     ad8460_dac_input_write),
> +	AD8460_CHAN_EXT_INFO("raw3", 3, ad8460_dac_input_read,
> +			     ad8460_dac_input_write),
> +	AD8460_CHAN_EXT_INFO("raw4", 4, ad8460_dac_input_read,
> +			     ad8460_dac_input_write),
> +	AD8460_CHAN_EXT_INFO("raw5", 5, ad8460_dac_input_read,
> +			     ad8460_dac_input_write),
> +	AD8460_CHAN_EXT_INFO("raw6", 6, ad8460_dac_input_read,
> +			     ad8460_dac_input_write),
> +	AD8460_CHAN_EXT_INFO("raw7", 7, ad8460_dac_input_read,
> +			     ad8460_dac_input_write),
> +	AD8460_CHAN_EXT_INFO("raw8", 8, ad8460_dac_input_read,
> +			     ad8460_dac_input_write),
> +	AD8460_CHAN_EXT_INFO("raw9", 9, ad8460_dac_input_read,
> +			     ad8460_dac_input_write),
> +	AD8460_CHAN_EXT_INFO("raw10", 10, ad8460_dac_input_read,
> +			     ad8460_dac_input_write),
> +	AD8460_CHAN_EXT_INFO("raw11", 11, ad8460_dac_input_read,
> +			     ad8460_dac_input_write),
> +	AD8460_CHAN_EXT_INFO("raw12", 12, ad8460_dac_input_read,
> +			     ad8460_dac_input_write),
> +	AD8460_CHAN_EXT_INFO("raw13", 13, ad8460_dac_input_read,
> +			     ad8460_dac_input_write),
> +	AD8460_CHAN_EXT_INFO("raw14", 14, ad8460_dac_input_read,
> +			     ad8460_dac_input_write),
> +	AD8460_CHAN_EXT_INFO("raw15", 15, ad8460_dac_input_read,
> +			     ad8460_dac_input_write),
> +	AD8460_CHAN_EXT_INFO("toggle_en", 0, ad8460_read_toggle_en,
> +			     ad8460_write_toggle_en),
> +	AD8460_CHAN_EXT_INFO("symbol", 0, ad8460_read_symbol,
> +			     ad8460_write_symbol),
> +	AD8460_CHAN_EXT_INFO("powerdown", 0, ad8460_read_powerdown,
> +			     ad8460_write_powerdown),
> +	IIO_ENUM("powerdown_mode", IIO_SEPARATE, &ad8460_powerdown_mode_enum),
> +	IIO_ENUM_AVAILABLE("powerdown_mode", IIO_SHARED_BY_TYPE,
> +			   &ad8460_powerdown_mode_enum),
> +	{}
> +};

...

> +static int ad8460_probe(struct spi_device *spi)
> +{
> +	struct ad8460_state *state;
> +	struct iio_dev *indio_dev;
> +	struct device *dev;
> +	u32 tmp[2], temp;
> +	int ret;
> +
> +	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*state));
> +	if (!indio_dev)
> +		return -ENOMEM;
> +
> +	state = iio_priv(indio_dev);
> +
> +	indio_dev->name = "ad8460";
> +	indio_dev->info = &ad8460_info;
> +
> +	state->spi = spi;
> +	dev = &spi->dev;
> +
> +	state->regmap = devm_regmap_init_spi(spi, &ad8460_regmap_config);
> +	if (IS_ERR(state->regmap))
> +		return dev_err_probe(dev, PTR_ERR(state->regmap),
> +				     "Failed to initialize regmap");
> +
> +	devm_mutex_init(dev, &state->lock);
> +
> +	state->sync_clk = devm_clk_get_enabled(dev, NULL);
> +	if (IS_ERR(state->sync_clk))
> +		return dev_err_probe(dev, PTR_ERR(state->sync_clk),
> +				     "Failed to get sync clk\n");
> +
> +	state->tmp_adc_channel = devm_iio_channel_get(dev, "ad8460-tmp");
> +	if (IS_ERR(state->tmp_adc_channel)) {
> +		if (PTR_ERR(state->tmp_adc_channel) == -EPROBE_DEFER)
> +			return -EPROBE_DEFER;
> +		indio_dev->channels = ad8460_channels;
> +		indio_dev->num_channels = ARRAY_SIZE(ad8460_channels);
> +	} else {
> +		indio_dev->channels = ad8460_channels_with_tmp_adc;
> +		indio_dev->num_channels = ARRAY_SIZE(ad8460_channels_with_tmp_adc);
> +	}
> +
> +	ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(ad8460_supplies),
> +					     ad8460_supplies);
> +	if (ret) {
> +		dev_err(dev, "Failed to enable power supplies\n");
> +		return ret;

Nitpick: return dev_err_probe() as done in other places?

> +	}
> +
> +	ret = devm_regulator_get_enable_read_voltage(dev, "refio_1p2v");
> +	if (ret < 0 && ret != -ENODEV)
> +		return dev_err_probe(dev, ret, "Failed to get reference voltage\n");
> +
> +	state->refio_1p2v_mv = ret == -ENODEV ? 1200 : ret / 1000;

...

CJ