[PATCH v4 7/8] IIO: ti_am335x_adc: Add DT support

[Patil, Rachna]

From: "Patil, Rachna" <rac...@ti.com>

Add DT support for client ADC driver.

Signed-off-by: Patil, Rachna <rac...@ti.com>
---
Changes in v4:
        Non-standard properties prefixed with vendor name.

 drivers/iio/adc/ti_am335x_adc.c |   26 ++++++++++++++++++++++----
 1 file changed, 22 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
index cd030e1..8e7b089 100644
--- a/drivers/iio/adc/ti_am335x_adc.c
+++ b/drivers/iio/adc/ti_am335x_adc.c
@@ -22,6 +22,8 @@
 #include <linux/platform_device.h>
 #include <linux/io.h>
 #include <linux/iio/iio.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
 
 #include <linux/mfd/ti_am335x_tscadc.h>
 #include <linux/platform_data/ti_am335x_adc.h>
@@ -141,11 +143,12 @@ static int tiadc_probe(struct platform_device *pdev)
        struct iio_dev          *indio_dev;
        struct tiadc_device     *adc_dev;
        struct ti_tscadc_dev    *tscadc_dev = pdev->dev.platform_data;
-       struct mfd_tscadc_board *pdata;
+       struct mfd_tscadc_board *pdata = tscadc_dev->dev->platform_data;
+       struct device_node      *node = tscadc_dev->dev->of_node;
        int                     err;
+       u32                     val32;
 
-       pdata = tscadc_dev->dev->platform_data;
-       if (!pdata || !pdata->adc_init) {
+       if (!pdata && !node) {
                dev_err(&pdev->dev, "Could not find platform data\n");
                return -EINVAL;
        }
@@ -159,7 +162,22 @@ static int tiadc_probe(struct platform_device *pdev)
        adc_dev = iio_priv(indio_dev);
 
        adc_dev->mfd_tscadc = tscadc_dev;
-       adc_dev->channels = pdata->adc_init->adc_channels;
+
+       if (pdata)
+               adc_dev->channels = pdata->adc_init->adc_channels;
+       else {
+               node = of_find_node_by_name(node, "adc");
+               if (!node)
+                       return  -EINVAL;
+               else {
+                       err = of_property_read_u32(node,
+                                       "ti,adc-channels", &val32);
+                       if (err < 0)
+                               goto err_free_device;
+                       else
+                               adc_dev->channels = val32;
+               }
+       }
 
        indio_dev->dev.parent = &pdev->dev;
        indio_dev->name = dev_name(&pdev->dev);
-- 
1.7.9.5

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