Devicetree can provide platform data
Signed-off-by: Sean Nyekjaer <sean.nyekjaer@xxxxxxxxx>
---
These large switch cases make the driver hard to read? Does someone have any
ideas to make this more readable?
The dc-dc-phase and channel mode i rather hard to do without defines? Will it
be okay to use them here?
Example:
adi,mode = CURRENT_4mA_20mA or adi,mode = VOLTAGE_PLUSMINUS_10V
They are generic DAC/ADC properties...
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 | 227 ++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 226 insertions(+), 1 deletion(-)
diff --git a/drivers/iio/dac/ad5755.c b/drivers/iio/dac/ad5755.c
index e1b6e78..4a2866e 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>
@@ -556,6 +557,223 @@ 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;
+
+ 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;
+
+ if (!of_property_read_u32(np, "adi,dc-dc-freq", &tmp))
+ switch (tmp) {
+ case 250000:
+ pdata->dc_dc_freq = AD5755_DC_DC_FREQ_250kHZ;
+ break;
+ case 410000:
+ pdata->dc_dc_freq = AD5755_DC_DC_FREQ_410kHZ;
+ break;
+ case 650000:
+ pdata->dc_dc_freq = AD5755_DC_DC_FREQ_650kHZ;
+ break;
+ default:
+ dev_err(dev,
+ "adi,dc-dc-freq out of range selecting 410kHz");
+ pdata->dc_dc_freq = AD5755_DC_DC_FREQ_410kHZ;
+ } else
+ pdata->dc_dc_freq = AD5755_DC_DC_FREQ_410kHZ;
+
+ if (!of_property_read_u32(np, "adi,dc-dc-maxv", &tmp))
+ switch (tmp) {
+ case 23000:
+ pdata->dc_dc_maxv = AD5755_DC_DC_MAXV_23V;
+ break;
+ case 24500:
+ pdata->dc_dc_maxv = AD5755_DC_DC_MAXV_24V5;
+ break;
+ case 27000:
+ pdata->dc_dc_maxv = AD5755_DC_DC_MAXV_27V;
+ break;
+ case 29500:
+ pdata->dc_dc_maxv = AD5755_DC_DC_MAXV_29V5;
+ break;
+ default:
+ dev_err(dev,
+ "adi,dc-dc-maxv out of range selecting 23V");
+ pdata->dc_dc_maxv = AD5755_DC_DC_MAXV_23V;
+ } else
+ pdata->dc_dc_maxv = AD5755_DC_DC_MAXV_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];
+ switch (tmparray[1]) {
+ case 64000:
+ pdata->dac[devnr].slew.rate =
+ AD5755_SLEW_RATE_64k;
+ break;
+ case 32000:
+ pdata->dac[devnr].slew.rate =
+ AD5755_SLEW_RATE_32k;
+ break;
+ case 16000:
+ pdata->dac[devnr].slew.rate =
+ AD5755_SLEW_RATE_16k;
+ break;
+ case 8000:
+ pdata->dac[devnr].slew.rate =
+ AD5755_SLEW_RATE_8k;
+ break;
+ case 4000:
+ pdata->dac[devnr].slew.rate =
+ AD5755_SLEW_RATE_4k;
+ break;
+ case 2000:
+ pdata->dac[devnr].slew.rate =
+ AD5755_SLEW_RATE_2k;
+ break;
+ case 1000:
+ pdata->dac[devnr].slew.rate =
+ AD5755_SLEW_RATE_1k;
+ break;
+ case 500:
+ pdata->dac[devnr].slew.rate =
+ AD5755_SLEW_RATE_500;
+ break;
+ case 250:
+ pdata->dac[devnr].slew.rate =
+ AD5755_SLEW_RATE_250;
+ break;
+ case 125:
+ pdata->dac[devnr].slew.rate =
+ AD5755_SLEW_RATE_125;
+ break;
+ case 64:
+ pdata->dac[devnr].slew.rate =
+ AD5755_SLEW_RATE_64;
+ break;
+ case 32:
+ pdata->dac[devnr].slew.rate =
+ AD5755_SLEW_RATE_32;
+ break;
+ case 16:
+ pdata->dac[devnr].slew.rate =
+ AD5755_SLEW_RATE_16;
+ break;
+ case 8:
+ pdata->dac[devnr].slew.rate =
+ AD5755_SLEW_RATE_8;
+ break;
+ case 4:
+ pdata->dac[devnr].slew.rate =
+ AD5755_SLEW_RATE_4;
+ break;
+ case 0:
+ pdata->dac[devnr].slew.rate =
+ AD5755_SLEW_RATE_0_5;
+ break;
+ default:
+ dev_err(dev,
+ "channel %d slew rate out of range selecting 64kHz",
+ devnr);
+ pdata->dac[devnr].slew.rate =
+ AD5755_SLEW_RATE_64k;
+ }
+ switch (tmparray[2]) {
+ case 1:
+ pdata->dac[devnr].slew.step_size =
+ AD5755_SLEW_STEP_SIZE_1;
+ break;
+ case 2:
+ pdata->dac[devnr].slew.step_size =
+ AD5755_SLEW_STEP_SIZE_2;
+ break;
+ case 4:
+ pdata->dac[devnr].slew.step_size =
+ AD5755_SLEW_STEP_SIZE_4;
+ break;
+ case 16:
+ pdata->dac[devnr].slew.step_size =
+ AD5755_SLEW_STEP_SIZE_16;
+ break;
+ case 32:
+ pdata->dac[devnr].slew.step_size =
+ AD5755_SLEW_STEP_SIZE_32;
+ break;
+ case 64:
+ pdata->dac[devnr].slew.step_size =
+ AD5755_SLEW_STEP_SIZE_64;
+ break;
+ case 128:
+ pdata->dac[devnr].slew.step_size =
+ AD5755_SLEW_STEP_SIZE_128;
+ break;
+ case 256:
+ pdata->dac[devnr].slew.step_size =
+ AD5755_SLEW_STEP_SIZE_256;
+ break;
+ default:
+ dev_err(dev,
+ "channel %d slew step size out of range selecting 1 LSB",
+ devnr);
+ pdata->dac[devnr].slew.step_size =
+ AD5755_SLEW_STEP_SIZE_1;
+ }
+ } 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 adf4350_platform_data *adf4350_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 +801,15 @@ 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)
--
2.7.2
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