Bluetooth: btmrvl: add DT bindings documentation

Calibration data can be downloaded through device tree method. This
patch adds the documentation. Also, instead of searching device tree
node by name using of_find_node_by_name() API, let's use
for_each_compatible_node().

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Cathy Luo <cluo@marvell.com>
Signed-off-by: Avinash Patil <patila@marvell.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/Documentation/devicetree/bindings/btmrvl.txt b/Documentation/devicetree/bindings/btmrvl.txt
new file mode 100644 (file)
index 0000000..cdd5768
--- /dev/null
+++ b/Documentation/devicetree/bindings/btmrvl.txt
@@ -0,0 +1,22 @@
+btmrvl
+------
+
+Required properties:
+
+  - compatible : must be "btmrvl,cfgdata"
+
+Optional properties:
+
+  - btmrvl,cal-data : Calibration data downloaded to the device during
+                     initialization. This is an array of 28 values(u8).
+
+Example:
+
+btmrvl {
+       compatible = "btmrvl,cfgdata";
+
+       btmrvl,cal-data = /bits/ 8 <
+               0x37 0x01 0x1c 0x00 0xff 0xff 0xff 0xff 0x01 0x7f 0x04 0x02
+               0x00 0x00 0xba 0xce 0xc0 0xc6 0x2d 0x00 0x00 0x00 0x00 0x00
+               0x00 0x00 0xf0 0x00>;
+};

diff --git a/drivers/bluetooth/btmrvl_main.c b/drivers/bluetooth/btmrvl_main.c
index 1d7db20..2909bca 100644 (file)
--- a/drivers/bluetooth/btmrvl_main.c
+++ b/drivers/bluetooth/btmrvl_main.c
@@ -496,25 +496,22 @@ static int btmrvl_cal_data_dt(struct btmrvl_private *priv)
 {
        struct device_node *dt_node;
        u8 cal_data[BT_CAL_HDR_LEN + BT_CAL_DATA_SIZE];
-       const char name[] = "btmrvl_caldata";
-       const char property[] = "btmrvl,caldata";
        int ret;
 
-       dt_node = of_find_node_by_name(NULL, name);
-       if (!dt_node)
-               return -ENODEV;
-
-       ret = of_property_read_u8_array(dt_node, property,
-                                       cal_data + BT_CAL_HDR_LEN,
-                                       BT_CAL_DATA_SIZE);
-       if (ret)
-               return ret;
-
-       BT_DBG("Use cal data from device tree");
-       ret = btmrvl_download_cal_data(priv, cal_data, BT_CAL_DATA_SIZE);
-       if (ret) {
-               BT_ERR("Fail to download calibrate data");
-               return ret;
+       for_each_compatible_node(dt_node, NULL, "btmrvl,cfgdata") {
+               ret = of_property_read_u8_array(dt_node, "btmrvl,cal-data",
+                                               cal_data + BT_CAL_HDR_LEN,
+                                               BT_CAL_DATA_SIZE);
+               if (ret)
+                       return ret;
+
+               BT_DBG("Use cal data from device tree");
+               ret = btmrvl_download_cal_data(priv, cal_data,
+                                              BT_CAL_DATA_SIZE);
+               if (ret) {
+                       BT_ERR("Fail to download calibrate data");
+                       return ret;
+               }
        }
 
        return 0;