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>

diff --git a/drivers/iio/dac/ad5755.c b/drivers/iio/dac/ad5755.c
index bfb350a..0fde593 100644 (file)
--- 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",