Bindings/net/nokia-bluetooth.txt

   1 Nokia Bluetooth Chips
   2 ---------------------
   3
   4 Nokia phones often come with UART connected bluetooth chips from different
   5 vendors and modified device API. Those devices speak a protocol named H4+
   6 (also known as h4p) by Nokia, which is similar to the H4 protocol from the
   7 Bluetooth standard. In addition to the H4 protocol it specifies two more
   8 UART status lines for wakeup of UART transceivers to improve power management
   9 and a few new packet types used to negotiate uart speed.
  10
  11 Required properties:
  12
  13  - compatible: should contain "nokia,h4p-bluetooth" as well as one of the following:
  14    * "brcm,bcm2048-nokia"
  15    * "ti,wl1271-bluetooth-nokia"
  16  - reset-gpios: GPIO specifier, used to reset the BT module (active low)
  17  - bluetooth-wakeup-gpios: GPIO specifier, used to wakeup the BT module (active high)
  18  - host-wakeup-gpios: GPIO specifier, used to wakeup the host processor (active high)
  19  - clock-names: should be "sysclk"
  20  - clocks: should contain a clock specifier for every name in clock-names
  21
  22 Optional properties:
  23
  24  - None
  25
  26 Example:
  27
  28 / {
  29        /* controlled (enabled/disabled) directly by BT module */
  30        bluetooth_clk: vctcxo {
  31                compatible = "fixed-clock";
  32                #clock-cells = <0>;
  33                clock-frequency = <38400000>;
  34        };
  35 };
  36
  37 &uart2 {
  38        pinctrl-names = "default";
  39        pinctrl-0 = <&uart2_pins>;
  40
  41        bluetooth {
  42                compatible = "ti,wl1271-bluetooth-nokia", "nokia,h4p-bluetooth";
  43
  44                reset-gpios = <&gpio1 26 GPIO_ACTIVE_LOW>; /* gpio26 */
  45                host-wakeup-gpios = <&gpio4 5 GPIO_ACTIVE_HIGH>; /* gpio101 */
  46                bluetooth-wakeup-gpios = <&gpio2 5 GPIO_ACTIVE_HIGH>; /* gpio37 */
  47
  48                clocks = <&bluetooth_clk>;
  49                clock-names = "sysclk";
  50        };
  51 };