iio: ti_am335x_adc: Add DT support

Add DT support for client ADC driver.

Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Patil, Rachna <rachna@ti.com>
Signed-off-by: Pantelis Antoniou <panto@antoniou-consulting.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

1 files changed, 24 insertions, 5 deletions

diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
index 543b9c42ac5f..b24402cb5432 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>
@@ -152,11 +154,12 @@ static int tiadc_probe(struct platform_device *pdev)
         struct iio_dev          *indio_dev;
         struct tiadc_device     *adc_dev;
         struct ti_tscadc_dev    *tscadc_dev = ti_tscadc_dev_get(pdev);
-        struct mfd_tscadc_board *pdata;
+        struct mfd_tscadc_board *pdata = tscadc_dev->dev->platform_data;
+        struct device_node      *node = pdev->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;
         }
@@ -169,8 +172,17 @@ 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;
+        adc_dev->mfd_tscadc = ti_tscadc_dev_get(pdev);
+
+        if (pdata)
+                adc_dev->channels = pdata->adc_init->adc_channels;
+        else {
+                err = of_property_read_u32(node,
+                                "ti,adc-channels", &val32);
+                if (err < 0)
+                        goto err_free_device;
+                adc_dev->channels = val32;
+        }
 
         indio_dev->dev.parent = &pdev->dev;
         indio_dev->name = dev_name(&pdev->dev);
@@ -260,11 +272,18 @@ static const struct dev_pm_ops tiadc_pm_ops = {
 #define TIADC_PM_OPS NULL
 #endif
 
+static const struct of_device_id ti_adc_dt_ids[] = {
+        { .compatible = "ti,am3359-adc", },
+        { }
+};
+MODULE_DEVICE_TABLE(of, ti_adc_dt_ids);
+
 static struct platform_driver tiadc_driver = {
         .driver = {
                 .name   = "tiadc",
                 .owner  = THIS_MODULE,
                 .pm     = TIADC_PM_OPS,
+                .of_match_table = of_match_ptr(ti_adc_dt_ids),
         },
         .probe  = tiadc_probe,
         .remove = tiadc_remove,