linux-kernel - [PATCH 06/11] staging: iio: ad7746: Add dt-bindings

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Date:   Wed, 21 Mar 2018 11:28:54 -0300
From:   Hernán Gonzalez <hernan@...guardiasur.com.ar>
To:     lars@...afoo.de, Michael.Hennerich@...log.com, jic23@...nel.org,
        knaack.h@....de, pmeerw@...erw.net, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, hernan@...guardiasur.com.ar
Subject: [PATCH 06/11] staging: iio: ad7746: Add dt-bindings

This patch adds dt bindings by populating a pdata struct in order to
modify as little as possible the existing code. It supports both
platform_data and dt-bindings but uses only one depending on
CONFIG_OF's value.

Signed-off-by: Hernán Gonzalez <hernan@...guardiasur.com.ar>
---
 drivers/staging/iio/cdc/ad7746.c | 55 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 54 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/iio/cdc/ad7746.c b/drivers/staging/iio/cdc/ad7746.c
index cba8cd1..815573c 100644
--- a/drivers/staging/iio/cdc/ad7746.c
+++ b/drivers/staging/iio/cdc/ad7746.c
@@ -658,6 +658,44 @@ static const struct iio_info ad7746_info = {
 /*
  * device probe and remove
  */
+#ifdef CONFIG_OF
+static struct ad7746_platform_data *ad7746_parse_dt(struct device *dev)
+{
+	struct device_node *np = dev->of_node;
+	struct ad7746_platform_data *pdata;
+	unsigned int tmp;
+	int ret;
+
+	/* The default excitation outputs are not inverted, it should be stated
+	 * in the dt if needed.
+	 */
+
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return NULL;
+
+	tmp = 0;
+	ret = of_property_read_u32(np, "adi,exclvl", &tmp);
+	if (ret || tmp > 3) {
+		dev_warn(dev, "Wrong exclvl value, using default\n");
+		pdata->exclvl = 3; /* default value */
+	} else {
+		pdata->exclvl = tmp;
+	}
+
+	pdata->exca_inv_en = of_property_read_bool(np, "adi,nexca_en");
+	pdata->excb_inv_en = of_property_read_bool(np, "adi,nexcb_en");
+	pdata->exca_en = !pdata->exca_inv_en;
+	pdata->excb_en = !pdata->excb_inv_en;
+
+	return pdata;
+}
+#else
+static struct ad7746_platform_data *ad7746_parse_dt(struct device *dev)
+{
+	return NULL;
+}
+#endif
 
 static int ad7746_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
@@ -668,6 +706,11 @@ static int ad7746_probe(struct i2c_client *client,
 	unsigned char regval = 0;
 	int ret = 0;
 
+	if (client->dev.of_node)
+		pdata = ad7746_parse_dt(&client->dev);
+	else
+		pdata = client->dev.platform_data;
+
 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
 	if (!indio_dev)
 		return -ENOMEM;
@@ -731,12 +774,22 @@ static const struct i2c_device_id ad7746_id[] = {
 	{ "ad7747", 7747 },
 	{}
 };
-
 MODULE_DEVICE_TABLE(i2c, ad7746_id);
 
+#ifdef CONFIG_OF
+static const struct of_device_id ad7746_of_match[] = {
+	{ .compatible = "adi,ad7745" },
+	{ .compatible = "adi,ad7746" },
+	{ .compatible = "adi,ad7747" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ad7746_of_match);
+#endif
+
 static struct i2c_driver ad7746_driver = {
 	.driver = {
 		.name = KBUILD_MODNAME,
+		.of_match_table = of_match_ptr(ad7746_of_match),
 	},
 	.probe = ad7746_probe,
 	.id_table = ad7746_id,
-- 
2.7.4