Commit c9474599 authored by Sean Nyekjaer's avatar Sean Nyekjaer Committed by Jonathan Cameron
Browse files

iio: ad5755: add support for dt bindings



Devicetree can provide platform data
Signed-off-by: default avatarSean Nyekjaer <sean.nyekjaer@prevas.dk>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 29e3e06d
......@@ -14,6 +14,7 @@
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/delay.h>
#include <linux/of.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/platform_data/ad5755.h>
......@@ -109,6 +110,51 @@ enum ad5755_type {
ID_AD5737,
};
#ifdef CONFIG_OF
static const int ad5755_dcdc_freq_table[][2] = {
{ 250000, AD5755_DC_DC_FREQ_250kHZ },
{ 410000, AD5755_DC_DC_FREQ_410kHZ },
{ 650000, AD5755_DC_DC_FREQ_650kHZ }
};
static const int ad5755_dcdc_maxv_table[][2] = {
{ 23000000, AD5755_DC_DC_MAXV_23V },
{ 24500000, AD5755_DC_DC_MAXV_24V5 },
{ 27000000, AD5755_DC_DC_MAXV_27V },
{ 29500000, AD5755_DC_DC_MAXV_29V5 },
};
static const int ad5755_slew_rate_table[][2] = {
{ 64000, AD5755_SLEW_RATE_64k },
{ 32000, AD5755_SLEW_RATE_32k },
{ 16000, AD5755_SLEW_RATE_16k },
{ 8000, AD5755_SLEW_RATE_8k },
{ 4000, AD5755_SLEW_RATE_4k },
{ 2000, AD5755_SLEW_RATE_2k },
{ 1000, AD5755_SLEW_RATE_1k },
{ 500, AD5755_SLEW_RATE_500 },
{ 250, AD5755_SLEW_RATE_250 },
{ 125, AD5755_SLEW_RATE_125 },
{ 64, AD5755_SLEW_RATE_64 },
{ 32, AD5755_SLEW_RATE_32 },
{ 16, AD5755_SLEW_RATE_16 },
{ 8, AD5755_SLEW_RATE_8 },
{ 4, AD5755_SLEW_RATE_4 },
{ 0, AD5755_SLEW_RATE_0_5 },
};
static const int ad5755_slew_step_table[][2] = {
{ 256, AD5755_SLEW_STEP_SIZE_256 },
{ 128, AD5755_SLEW_STEP_SIZE_128 },
{ 64, AD5755_SLEW_STEP_SIZE_64 },
{ 32, AD5755_SLEW_STEP_SIZE_32 },
{ 16, AD5755_SLEW_STEP_SIZE_16 },
{ 4, AD5755_SLEW_STEP_SIZE_4 },
{ 2, AD5755_SLEW_STEP_SIZE_2 },
{ 1, AD5755_SLEW_STEP_SIZE_1 },
};
#endif
static int ad5755_write_unlocked(struct iio_dev *indio_dev,
unsigned int reg, unsigned int val)
{
......@@ -556,6 +602,129 @@ static const struct ad5755_platform_data ad5755_default_pdata = {
},
};
#ifdef CONFIG_OF
static struct ad5755_platform_data *ad5755_parse_dt(struct device *dev)
{
struct device_node *np = dev->of_node;
struct device_node *pp;
struct ad5755_platform_data *pdata;
unsigned int tmp;
unsigned int tmparray[3];
int devnr, i;
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return NULL;
pdata->ext_dc_dc_compenstation_resistor =
of_property_read_bool(np, "adi,ext-dc-dc-compenstation-resistor");
if (!of_property_read_u32(np, "adi,dc-dc-phase", &tmp))
pdata->dc_dc_phase = tmp;
else
pdata->dc_dc_phase = AD5755_DC_DC_PHASE_ALL_SAME_EDGE;
pdata->dc_dc_freq = AD5755_DC_DC_FREQ_410kHZ;
if (!of_property_read_u32(np, "adi,dc-dc-freq-hz", &tmp)) {
for (i = 0; i < ARRAY_SIZE(ad5755_dcdc_freq_table); i++) {
if (tmp == ad5755_dcdc_freq_table[i][0]) {
pdata->dc_dc_freq = ad5755_dcdc_freq_table[i][1];
break;
}
}
if (i == ARRAY_SIZE(ad5755_dcdc_freq_table)) {
dev_err(dev,
"adi,dc-dc-freq out of range selecting 410kHz");
}
}
pdata->dc_dc_maxv = AD5755_DC_DC_MAXV_23V;
if (!of_property_read_u32(np, "adi,dc-dc-max-microvolt", &tmp)) {
for (i = 0; i < ARRAY_SIZE(ad5755_dcdc_maxv_table); i++) {
if (tmp == ad5755_dcdc_maxv_table[i][0]) {
pdata->dc_dc_maxv = ad5755_dcdc_maxv_table[i][1];
break;
}
}
if (i == ARRAY_SIZE(ad5755_dcdc_maxv_table)) {
dev_err(dev,
"adi,dc-dc-maxv out of range selecting 23V");
}
}
devnr = 0;
for_each_child_of_node(np, pp) {
if (devnr > AD5755_NUM_CHANNELS) {
dev_err(dev,
"There is to many channels defined in DT\n");
goto error_out;
}
if (!of_property_read_u32(pp, "adi,mode", &tmp))
pdata->dac[devnr].mode = tmp;
else
pdata->dac[devnr].mode = AD5755_MODE_CURRENT_4mA_20mA;
pdata->dac[devnr].ext_current_sense_resistor =
of_property_read_bool(pp, "adi,ext-current-sense-resistor");
pdata->dac[devnr].enable_voltage_overrange =
of_property_read_bool(pp, "adi,enable-voltage-overrange");
if (!of_property_read_u32_array(pp, "adi,slew", tmparray, 3)) {
pdata->dac[devnr].slew.enable = tmparray[0];
pdata->dac[devnr].slew.rate = AD5755_SLEW_RATE_64k;
for (i = 0; i < ARRAY_SIZE(ad5755_slew_rate_table); i++) {
if (tmparray[1] == ad5755_slew_rate_table[i][0]) {
pdata->dac[devnr].slew.rate =
ad5755_slew_rate_table[i][1];
break;
}
}
if (i == ARRAY_SIZE(ad5755_slew_rate_table)) {
dev_err(dev,
"channel %d slew rate out of range selecting 64kHz",
devnr);
}
pdata->dac[devnr].slew.step_size = AD5755_SLEW_STEP_SIZE_1;
for (i = 0; i < ARRAY_SIZE(ad5755_slew_step_table); i++) {
if (tmparray[2] == ad5755_slew_step_table[i][0]) {
pdata->dac[devnr].slew.step_size =
ad5755_slew_step_table[i][1];
break;
}
}
if (i == ARRAY_SIZE(ad5755_slew_step_table)) {
dev_err(dev,
"channel %d slew step size out of range selecting 1 LSB",
devnr);
}
} else {
pdata->dac[devnr].slew.enable = false;
pdata->dac[devnr].slew.rate = AD5755_SLEW_RATE_64k;
pdata->dac[devnr].slew.step_size =
AD5755_SLEW_STEP_SIZE_1;
}
devnr++;
}
return pdata;
error_out:
devm_kfree(dev, pdata);
return NULL;
}
#else
static
struct ad5755_platform_data *ad5755_parse_dt(struct device *dev)
{
return NULL;
}
#endif
static int ad5755_probe(struct spi_device *spi)
{
enum ad5755_type type = spi_get_device_id(spi)->driver_data;
......@@ -583,8 +752,15 @@ static int ad5755_probe(struct spi_device *spi)
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->num_channels = AD5755_NUM_CHANNELS;
if (!pdata)
if (spi->dev.of_node)
pdata = ad5755_parse_dt(&spi->dev);
else
pdata = spi->dev.platform_data;
if (!pdata) {
dev_warn(&spi->dev, "no platform data? using default\n");
pdata = &ad5755_default_pdata;
}
ret = ad5755_init_channels(indio_dev, pdata);
if (ret)
......@@ -607,6 +783,16 @@ static const struct spi_device_id ad5755_id[] = {
};
MODULE_DEVICE_TABLE(spi, ad5755_id);
static const struct of_device_id ad5755_of_match[] = {
{ .compatible = "adi,ad5755" },
{ .compatible = "adi,ad5755-1" },
{ .compatible = "adi,ad5757" },
{ .compatible = "adi,ad5735" },
{ .compatible = "adi,ad5737" },
{ }
};
MODULE_DEVICE_TABLE(of, ad5755_of_match);
static struct spi_driver ad5755_driver = {
.driver = {
.name = "ad5755",
......
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment