[PATCH] stagging:iio:ad9834: add devicetree property support

[Gwenhael Goavec-Merou]

ad9834 driver needs some default properties. Currently these parameters are
provided through platform_data.
This patch adds a function to create this pdata based on device-tree node.

Signed-off-by: Gwenhael Goavec-Merou <gwenhael.goavec-me...@trabucayre.com>
---
 drivers/staging/iio/frequency/ad9834.c | 39 ++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/drivers/staging/iio/frequency/ad9834.c 
b/drivers/staging/iio/frequency/ad9834.c
index 6366216..6cec154 100644
--- a/drivers/staging/iio/frequency/ad9834.c
+++ b/drivers/staging/iio/frequency/ad9834.c
@@ -316,6 +316,39 @@ static const struct iio_info ad9833_info = {
        .driver_module = THIS_MODULE,
 };
 
+#if defined(CONFIG_OF)
+static struct ad9834_platform_data *ad9834_parse_dt(struct spi_device *spi)
+{
+       struct ad9834_platform_data *pdata;
+       struct device_node *np = spi->dev.of_node;
+
+       pdata = devm_kzalloc(&spi->dev, sizeof(*pdata), GFP_KERNEL);
+       if (!pdata)
+               return ERR_PTR(-ENOMEM);
+
+       if (of_property_read_u32(np, "mclk", &pdata->mclk))
+               return ERR_PTR(-ENODEV);
+       if (of_property_read_u32(np, "freq0", &pdata->freq0))
+               return ERR_PTR(-ENODEV);
+       if (of_property_read_u32(np, "freq1", &pdata->freq1))
+               return ERR_PTR(-ENODEV);
+       if (of_property_read_u16(np, "phase0", &pdata->phase0))
+               return ERR_PTR(-ENODEV);
+       if (of_property_read_u16(np, "phase1", &pdata->phase1))
+               return ERR_PTR(-ENODEV);
+       pdata->en_div2 = of_property_read_bool(np, "en_div2");
+       pdata->en_signbit_msb_out = of_property_read_bool(np,
+                                       "en_signbit_msb_out");
+
+       return pdata;
+}
+#else
+static struct ad9834_platform_data *ad9834_parse_dt(struct spi_device *spi)
+{
+       return NULL;
+}
+#endif
+
 static int ad9834_probe(struct spi_device *spi)
 {
        struct ad9834_platform_data *pdata = dev_get_platdata(&spi->dev);
@@ -324,6 +357,12 @@ static int ad9834_probe(struct spi_device *spi)
        struct regulator *reg;
        int ret;
 
+       if (!pdata && spi->dev.of_node) {
+               pdata = ad9834_parse_dt(spi);
+               if (IS_ERR(pdata))
+                       return PTR_ERR(pdata);
+       }
+
        if (!pdata) {
                dev_dbg(&spi->dev, "no platform data?\n");
                return -ENODEV;
-- 
2.9.3

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