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iio: ad5755: add support for dt bindings
Devicetree can provide platform data Signed-off-by: Sean Nyekjaer <sean.nyekjaer@prevas.dk> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Sean Nyekjaer
Jonathan Cameron
parent
29e3e06d89
commit
c947459979
@ -14,6 +14,7 @@
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include <linux/delay.h>
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#include <linux/of.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/platform_data/ad5755.h>
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@ -109,6 +110,51 @@ enum ad5755_type {
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ID_AD5737,
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};
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#ifdef CONFIG_OF
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static const int ad5755_dcdc_freq_table[][2] = {
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{ 250000, AD5755_DC_DC_FREQ_250kHZ },
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{ 410000, AD5755_DC_DC_FREQ_410kHZ },
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{ 650000, AD5755_DC_DC_FREQ_650kHZ }
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};
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static const int ad5755_dcdc_maxv_table[][2] = {
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{ 23000000, AD5755_DC_DC_MAXV_23V },
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{ 24500000, AD5755_DC_DC_MAXV_24V5 },
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{ 27000000, AD5755_DC_DC_MAXV_27V },
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{ 29500000, AD5755_DC_DC_MAXV_29V5 },
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};
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static const int ad5755_slew_rate_table[][2] = {
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{ 64000, AD5755_SLEW_RATE_64k },
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{ 32000, AD5755_SLEW_RATE_32k },
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{ 16000, AD5755_SLEW_RATE_16k },
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{ 8000, AD5755_SLEW_RATE_8k },
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{ 4000, AD5755_SLEW_RATE_4k },
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{ 2000, AD5755_SLEW_RATE_2k },
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{ 1000, AD5755_SLEW_RATE_1k },
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{ 500, AD5755_SLEW_RATE_500 },
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{ 250, AD5755_SLEW_RATE_250 },
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{ 125, AD5755_SLEW_RATE_125 },
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{ 64, AD5755_SLEW_RATE_64 },
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{ 32, AD5755_SLEW_RATE_32 },
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{ 16, AD5755_SLEW_RATE_16 },
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{ 8, AD5755_SLEW_RATE_8 },
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{ 4, AD5755_SLEW_RATE_4 },
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{ 0, AD5755_SLEW_RATE_0_5 },
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};
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static const int ad5755_slew_step_table[][2] = {
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{ 256, AD5755_SLEW_STEP_SIZE_256 },
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{ 128, AD5755_SLEW_STEP_SIZE_128 },
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{ 64, AD5755_SLEW_STEP_SIZE_64 },
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{ 32, AD5755_SLEW_STEP_SIZE_32 },
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{ 16, AD5755_SLEW_STEP_SIZE_16 },
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{ 4, AD5755_SLEW_STEP_SIZE_4 },
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{ 2, AD5755_SLEW_STEP_SIZE_2 },
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{ 1, AD5755_SLEW_STEP_SIZE_1 },
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};
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#endif
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static int ad5755_write_unlocked(struct iio_dev *indio_dev,
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unsigned int reg, unsigned int val)
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{
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@ -556,6 +602,129 @@ static const struct ad5755_platform_data ad5755_default_pdata = {
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},
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};
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#ifdef CONFIG_OF
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static struct ad5755_platform_data *ad5755_parse_dt(struct device *dev)
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{
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struct device_node *np = dev->of_node;
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struct device_node *pp;
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struct ad5755_platform_data *pdata;
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unsigned int tmp;
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unsigned int tmparray[3];
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int devnr, i;
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pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return NULL;
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pdata->ext_dc_dc_compenstation_resistor =
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of_property_read_bool(np, "adi,ext-dc-dc-compenstation-resistor");
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if (!of_property_read_u32(np, "adi,dc-dc-phase", &tmp))
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pdata->dc_dc_phase = tmp;
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else
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pdata->dc_dc_phase = AD5755_DC_DC_PHASE_ALL_SAME_EDGE;
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pdata->dc_dc_freq = AD5755_DC_DC_FREQ_410kHZ;
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if (!of_property_read_u32(np, "adi,dc-dc-freq-hz", &tmp)) {
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for (i = 0; i < ARRAY_SIZE(ad5755_dcdc_freq_table); i++) {
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if (tmp == ad5755_dcdc_freq_table[i][0]) {
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pdata->dc_dc_freq = ad5755_dcdc_freq_table[i][1];
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break;
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}
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}
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if (i == ARRAY_SIZE(ad5755_dcdc_freq_table)) {
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dev_err(dev,
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"adi,dc-dc-freq out of range selecting 410kHz");
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}
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}
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pdata->dc_dc_maxv = AD5755_DC_DC_MAXV_23V;
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if (!of_property_read_u32(np, "adi,dc-dc-max-microvolt", &tmp)) {
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for (i = 0; i < ARRAY_SIZE(ad5755_dcdc_maxv_table); i++) {
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if (tmp == ad5755_dcdc_maxv_table[i][0]) {
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pdata->dc_dc_maxv = ad5755_dcdc_maxv_table[i][1];
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break;
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}
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}
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if (i == ARRAY_SIZE(ad5755_dcdc_maxv_table)) {
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dev_err(dev,
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"adi,dc-dc-maxv out of range selecting 23V");
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}
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}
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devnr = 0;
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for_each_child_of_node(np, pp) {
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if (devnr > AD5755_NUM_CHANNELS) {
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dev_err(dev,
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"There is to many channels defined in DT\n");
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goto error_out;
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}
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if (!of_property_read_u32(pp, "adi,mode", &tmp))
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pdata->dac[devnr].mode = tmp;
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else
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pdata->dac[devnr].mode = AD5755_MODE_CURRENT_4mA_20mA;
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pdata->dac[devnr].ext_current_sense_resistor =
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of_property_read_bool(pp, "adi,ext-current-sense-resistor");
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pdata->dac[devnr].enable_voltage_overrange =
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of_property_read_bool(pp, "adi,enable-voltage-overrange");
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if (!of_property_read_u32_array(pp, "adi,slew", tmparray, 3)) {
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pdata->dac[devnr].slew.enable = tmparray[0];
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pdata->dac[devnr].slew.rate = AD5755_SLEW_RATE_64k;
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for (i = 0; i < ARRAY_SIZE(ad5755_slew_rate_table); i++) {
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if (tmparray[1] == ad5755_slew_rate_table[i][0]) {
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pdata->dac[devnr].slew.rate =
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ad5755_slew_rate_table[i][1];
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break;
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}
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}
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if (i == ARRAY_SIZE(ad5755_slew_rate_table)) {
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dev_err(dev,
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"channel %d slew rate out of range selecting 64kHz",
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devnr);
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}
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pdata->dac[devnr].slew.step_size = AD5755_SLEW_STEP_SIZE_1;
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for (i = 0; i < ARRAY_SIZE(ad5755_slew_step_table); i++) {
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if (tmparray[2] == ad5755_slew_step_table[i][0]) {
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pdata->dac[devnr].slew.step_size =
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ad5755_slew_step_table[i][1];
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break;
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}
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}
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if (i == ARRAY_SIZE(ad5755_slew_step_table)) {
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dev_err(dev,
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"channel %d slew step size out of range selecting 1 LSB",
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devnr);
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}
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} else {
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pdata->dac[devnr].slew.enable = false;
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pdata->dac[devnr].slew.rate = AD5755_SLEW_RATE_64k;
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pdata->dac[devnr].slew.step_size =
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AD5755_SLEW_STEP_SIZE_1;
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}
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devnr++;
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}
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return pdata;
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error_out:
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devm_kfree(dev, pdata);
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return NULL;
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}
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#else
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static
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struct ad5755_platform_data *ad5755_parse_dt(struct device *dev)
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{
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return NULL;
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}
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#endif
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static int ad5755_probe(struct spi_device *spi)
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{
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enum ad5755_type type = spi_get_device_id(spi)->driver_data;
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@ -583,8 +752,15 @@ static int ad5755_probe(struct spi_device *spi)
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->num_channels = AD5755_NUM_CHANNELS;
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if (!pdata)
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if (spi->dev.of_node)
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pdata = ad5755_parse_dt(&spi->dev);
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else
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pdata = spi->dev.platform_data;
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if (!pdata) {
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dev_warn(&spi->dev, "no platform data? using default\n");
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pdata = &ad5755_default_pdata;
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}
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ret = ad5755_init_channels(indio_dev, pdata);
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if (ret)
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@ -607,6 +783,16 @@ static const struct spi_device_id ad5755_id[] = {
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};
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MODULE_DEVICE_TABLE(spi, ad5755_id);
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static const struct of_device_id ad5755_of_match[] = {
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{ .compatible = "adi,ad5755" },
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{ .compatible = "adi,ad5755-1" },
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{ .compatible = "adi,ad5757" },
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{ .compatible = "adi,ad5735" },
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{ .compatible = "adi,ad5737" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, ad5755_of_match);
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static struct spi_driver ad5755_driver = {
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.driver = {
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.name = "ad5755",
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