forked from Minki/linux
1286be270e
Add binding document for serial bluetooth chips using Nokia H4+ protocol. Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Sebastian Reichel <sre@kernel.org> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
52 lines
1.7 KiB
Plaintext
52 lines
1.7 KiB
Plaintext
Nokia Bluetooth Chips
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---------------------
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Nokia phones often come with UART connected bluetooth chips from different
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vendors and modified device API. Those devices speak a protocol named H4+
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(also known as h4p) by Nokia, which is similar to the H4 protocol from the
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Bluetooth standard. In addition to the H4 protocol it specifies two more
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UART status lines for wakeup of UART transceivers to improve power management
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and a few new packet types used to negotiate uart speed.
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Required properties:
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- compatible: should contain "nokia,h4p-bluetooth" as well as one of the following:
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* "brcm,bcm2048-nokia"
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* "ti,wl1271-bluetooth-nokia"
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- reset-gpios: GPIO specifier, used to reset the BT module (active low)
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- bluetooth-wakeup-gpios: GPIO specifier, used to wakeup the BT module (active high)
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- host-wakeup-gpios: GPIO specifier, used to wakeup the host processor (active high)
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- clock-names: should be "sysclk"
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- clocks: should contain a clock specifier for every name in clock-names
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Optional properties:
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- None
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Example:
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/ {
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/* controlled (enabled/disabled) directly by BT module */
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bluetooth_clk: vctcxo {
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compatible = "fixed-clock";
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#clock-cells = <0>;
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clock-frequency = <38400000>;
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};
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};
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&uart2 {
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pinctrl-names = "default";
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pinctrl-0 = <&uart2_pins>;
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bluetooth {
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compatible = "ti,wl1271-bluetooth-nokia", "nokia,h4p-bluetooth";
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reset-gpios = <&gpio1 26 GPIO_ACTIVE_LOW>; /* gpio26 */
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host-wakeup-gpios = <&gpio4 5 GPIO_ACTIVE_HIGH>; /* gpio101 */
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bluetooth-wakeup-gpios = <&gpio2 5 GPIO_ACTIVE_HIGH>; /* gpio37 */
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clocks = <&bluetooth_clk>;
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clock-names = "sysclk";
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};
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};
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