linux-kernel - [PATCH v3 7/8] IIO: ti_am335x

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Date:	Fri, 18 Jan 2013 16:18:49 +0530
From:	"Patil, Rachna" <rachna@...com>
To:	<linux-doc@...r.kernel.org>, <devicetree-discuss@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>, <linux-input@...r.kernel.org>,
	<linux-iio@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
CC:	Samuel Ortiz <sameo@...ux.intel.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Dmitry Torokhov <dtor@...l.ru>,
	Rob Herring <rob.herring@...xeda.com>,
	Jonathan Cameron <jic23@....ac.uk>,
	Tony Lindgren <tony@...mide.com>,
	Benit Cousson <b-cousson@...com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Landley <rob@...dley.net>,
	Russell King <linux@....linux.org.uk>,
	"Patil, Rachna" <rachna@...com>
Subject: [PATCH v3 7/8] IIO: ti_am335x_adc: Add DT support

From: "Patil, Rachna" <rachna@...com>

Add DT support for client ADC driver.

Signed-off-by: Patil, Rachna <rachna@...com>
---
 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..81ca8e5 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,
+					"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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