| Nokia Bluetooth Chips |
| --------------------- |
| |
| Nokia phones often come with UART connected bluetooth chips from different |
| vendors and modified device API. Those devices speak a protocol named H4+ |
| (also known as h4p) by Nokia, which is similar to the H4 protocol from the |
| Bluetooth standard. In addition to the H4 protocol it specifies two more |
| UART status lines for wakeup of UART transceivers to improve power management |
| and a few new packet types used to negotiate uart speed. |
| |
| Required properties: |
| |
| - compatible: should contain "nokia,h4p-bluetooth" as well as one of the following: |
| * "brcm,bcm2048-nokia" |
| * "ti,wl1271-bluetooth-nokia" |
| - reset-gpios: GPIO specifier, used to reset the BT module (active low) |
| - bluetooth-wakeup-gpios: GPIO specifier, used to wakeup the BT module (active high) |
| - host-wakeup-gpios: GPIO specifier, used to wakeup the host processor (active high) |
| - clock-names: should be "sysclk" |
| - clocks: should contain a clock specifier for every name in clock-names |
| |
| Optional properties: |
| |
| - None |
| |
| Example: |
| |
| / { |
| /* controlled (enabled/disabled) directly by BT module */ |
| bluetooth_clk: vctcxo { |
| compatible = "fixed-clock"; |
| #clock-cells = <0>; |
| clock-frequency = <38400000>; |
| }; |
| }; |
| |
| &uart2 { |
| pinctrl-names = "default"; |
| pinctrl-0 = <&uart2_pins>; |
| |
| bluetooth { |
| compatible = "ti,wl1271-bluetooth-nokia", "nokia,h4p-bluetooth"; |
| |
| reset-gpios = <&gpio1 26 GPIO_ACTIVE_LOW>; /* gpio26 */ |
| host-wakeup-gpios = <&gpio4 5 GPIO_ACTIVE_HIGH>; /* gpio101 */ |
| bluetooth-wakeup-gpios = <&gpio2 5 GPIO_ACTIVE_HIGH>; /* gpio37 */ |
| |
| clocks = <&bluetooth_clk>; |
| clock-names = "sysclk"; |
| }; |
| }; |
