iio: frequency: adf4350: Add support for dt bindings

Per review feedback from Lars-Peter Clausen <lars@metafoo.de>
Changes since V1:
	Fix return value handling of adf4350_parse_dt()
	Use of_get_gpio
	Avoid abbreviations in devicetree properties
	Fix typo in docs

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 127 insertions, 1 deletions

diff --git a/drivers/iio/frequency/adf4350.c b/drivers/iio/frequency/adf4350.c
index f6849c8b6a90..a4157cdb314d 100644
--- a/drivers/iio/frequency/adf4350.c
+++ b/drivers/iio/frequency/adf4350.c
@@ -18,6 +18,8 @@
 #include <linux/gpio.h>
 #include <asm/div64.h>
 #include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
 
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
@@ -375,14 +377,138 @@ static const struct iio_info adf4350_info = {
         .driver_module = THIS_MODULE,
 };
 
+#ifdef CONFIG_OF
+static struct adf4350_platform_data *adf4350_parse_dt(struct device *dev)
+{
+        struct device_node *np = dev->of_node;
+        struct adf4350_platform_data *pdata;
+        unsigned int tmp;
+        int ret;
+
+        pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+        if (!pdata) {
+                dev_err(dev, "could not allocate memory for platform data\n");
+                return NULL;
+        }
+
+        strncpy(&pdata->name[0], np->name, SPI_NAME_SIZE - 1);
+
+        tmp = 10000;
+        of_property_read_u32(np, "adi,channel-spacing", &tmp);
+        pdata->channel_spacing = tmp;
+
+        tmp = 0;
+        of_property_read_u32(np, "adi,power-up-frequency", &tmp);
+        pdata->power_up_frequency = tmp;
+
+        tmp = 0;
+        of_property_read_u32(np, "adi,reference-div-factor", &tmp);
+        pdata->ref_div_factor = tmp;
+
+        ret = of_get_gpio(np, 0);
+        if (ret < 0)
+                pdata->gpio_lock_detect = -1;
+        else
+                pdata->gpio_lock_detect = ret;
+
+        pdata->ref_doubler_en = of_property_read_bool(np,
+                        "adi,reference-doubler-enable");
+        pdata->ref_div2_en = of_property_read_bool(np,
+                        "adi,reference-div2-enable");
+
+        /* r2_user_settings */
+        pdata->r2_user_settings = of_property_read_bool(np,
+                        "adi,phase-detector-polarity-positive-enable") ?
+                        ADF4350_REG2_PD_POLARITY_POS : 0;
+        pdata->r2_user_settings |= of_property_read_bool(np,
+                        "adi,lock-detect-precision-6ns-enable") ?
+                        ADF4350_REG2_LDP_6ns : 0;
+        pdata->r2_user_settings |= of_property_read_bool(np,
+                        "adi,lock-detect-function-integer-n-enable") ?
+                        ADF4350_REG2_LDF_INT_N : 0;
+
+        tmp = 2500;
+        of_property_read_u32(np, "adi,charge-pump-current", &tmp);
+        pdata->r2_user_settings |= ADF4350_REG2_CHARGE_PUMP_CURR_uA(tmp);
+
+        tmp = 0;
+        of_property_read_u32(np, "adi,muxout-select", &tmp);
+        pdata->r2_user_settings |= ADF4350_REG2_MUXOUT(tmp);
+
+        pdata->r2_user_settings |= of_property_read_bool(np,
+                        "adi,low-spur-mode-enable") ?
+                        ADF4350_REG2_NOISE_MODE(0x3) : 0;
+
+        /* r3_user_settings */
+
+        pdata->r3_user_settings = of_property_read_bool(np,
+                        "adi,cycle-slip-reduction-enable") ?
+                        ADF4350_REG3_12BIT_CSR_EN : 0;
+        pdata->r3_user_settings |= of_property_read_bool(np,
+                        "adi,charge-cancellation-enable") ?
+                        ADF4351_REG3_CHARGE_CANCELLATION_EN : 0;
+
+        pdata->r3_user_settings |= of_property_read_bool(np,
+                        "adi,anti-backlash-3ns-enable") ?
+                        ADF4351_REG3_ANTI_BACKLASH_3ns_EN : 0;
+        pdata->r3_user_settings |= of_property_read_bool(np,
+                        "adi,band-select-clock-mode-high-enable") ?
+                        ADF4351_REG3_BAND_SEL_CLOCK_MODE_HIGH : 0;
+
+        tmp = 0;
+        of_property_read_u32(np, "adi,12bit-clk-divider", &tmp);
+        pdata->r3_user_settings |= ADF4350_REG3_12BIT_CLKDIV(tmp);
+
+        tmp = 0;
+        of_property_read_u32(np, "adi,clk-divider-mode", &tmp);
+        pdata->r3_user_settings |= ADF4350_REG3_12BIT_CLKDIV_MODE(tmp);
+
+        /* r4_user_settings */
+
+        pdata->r4_user_settings = of_property_read_bool(np,
+                        "adi,aux-output-enable") ?
+                        ADF4350_REG4_AUX_OUTPUT_EN : 0;
+        pdata->r4_user_settings |= of_property_read_bool(np,
+                        "adi,aux-output-fundamental-enable") ?
+                        ADF4350_REG4_AUX_OUTPUT_FUND : 0;
+        pdata->r4_user_settings |= of_property_read_bool(np,
+                        "adi,mute-till-lock-enable") ?
+                        ADF4350_REG4_MUTE_TILL_LOCK_EN : 0;
+
+        tmp = 0;
+        of_property_read_u32(np, "adi,output-power", &tmp);
+        pdata->r4_user_settings |= ADF4350_REG4_OUTPUT_PWR(tmp);
+
+        tmp = 0;
+        of_property_read_u32(np, "adi,aux-output-power", &tmp);
+        pdata->r4_user_settings |= ADF4350_REG4_AUX_OUTPUT_PWR(tmp);
+
+        return pdata;
+}
+#else
+static
+struct adf4350_platform_data *adf4350_parse_dt(struct device *dev)
+{
+        return NULL;
+}
+#endif
+
 static int adf4350_probe(struct spi_device *spi)
 {
-        struct adf4350_platform_data *pdata = spi->dev.platform_data;
+        struct adf4350_platform_data *pdata;
         struct iio_dev *indio_dev;
         struct adf4350_state *st;
         struct clk *clk = NULL;
         int ret;
 
+        if (spi->dev.of_node) {
+                pdata = adf4350_parse_dt(&spi->dev);
+                if (pdata == NULL)
+                        return -EINVAL;
+        } else {
+                pdata = spi->dev.platform_data;
+        }
+
         if (!pdata) {
                 dev_warn(&spi->dev, "no platform data? using default\n");
                 pdata = &default_pdata;