Devicetree can provide platform data
Signed-off-by: Sean Nyekjaer <sean.nyekjaer@xxxxxxxxx>
---
Changes since v5:
- added CONFIG_OF define
Changes since v4:
- added lookups tables instead of large switchcases
Changes since v3:
- replaced '_' with '-'
- Now used actual values instead of register values.
Changes since v2:
- removed defines from DT
drivers/iio/dac/ad5755.c | 188 ++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 187 insertions(+), 1 deletion(-)
diff --git a/drivers/iio/dac/ad5755.c b/drivers/iio/dac/ad5755.c
index bfb350a..0fde593 100644
--- a/drivers/iio/dac/ad5755.c
+++ b/drivers/iio/dac/ad5755.c
@@ -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",
--
2.9.0
--
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