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

Hernán Gonzalez
2018-03-21T14:30:28Z

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@vanguardiasur.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