78 lines
2.4 KiB
Plaintext
78 lines
2.4 KiB
Plaintext
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Qualcomm SMSM Point-to-Point (SMP2P) GPIO Driver
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Used to map an SMP2P entry and remote processor ID to a virtual GPIO controller
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and virtual interrupt controller.
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Required properties:
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-compatible : should be "qcom,smp2pgpio";
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-qcom,entry-name : name of the SMP2P entry
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-qcom,remote-pid : the SMP2P remote processor ID (see smp2p_private_api.h)
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-gpio-controller : specifies that this is a GPIO controller
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-#gpio-cells : number of GPIO cells (should always be <2>)
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-interrupt-controller : specifies that this is an interrupt controller
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-#interrupt-cells : number of interrupt cells (should always be <2>)
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Optional properties:
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-qcom,is-inbound : specifies that this is an inbound entry (default is outbound)
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Comments:
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All device tree entries must be unique. Therefore to prevent naming collisions
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between clients, it is recommended that the DT nodes should be named using the
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format:
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smp2pgpio_<ENTRY_NAME>_<REMOTE PID>_<in|out>
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Example:
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/* Maps inbound "smp2p" entry on remote PID 7 to GPIO controller. */
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smp2pgpio_smp2p_7_in: qcom,smp2pgpio-smp2p-7-in {
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compatible = "qcom,smp2pgpio";
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qcom,entry-name = "smp2p";
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qcom,remote-pid = <7>;
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qcom,is-inbound;
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gpio-controller;
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#gpio-cells = <2>;
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interrupt-controller;
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#interrupt-cells = <2>;
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};
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/*
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* Maps inbound "smp2p" entry on remote PID 7 to client driver
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* "qcom,smp2pgpio_test_smp2p_7_in".
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*
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* Note: If all 32-pins are used by this client, then you
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* can just list pin 0 here as a shortcut.
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*/
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qcom,smp2pgpio_test_smp2p_7_in {
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compatible = "qcom,smp2pgpio_test_smp2p_7_in";
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gpios = <&smp2pgpio_smp2p_7_in 0 0>, /* pin 0 */
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<&smp2pgpio_smp2p_7_in 1 0>,
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. . .
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<&smp2pgpio_smp2p_7_in 31 0>; /* pin 31 */
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};
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/* Maps outbound "smp2p" entry on remote PID 7 to GPIO controller. */
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smp2pgpio_smp2p_7_out: qcom,smp2pgpio-smp2p-7-out {
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compatible = "qcom,smp2pgpio";
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qcom,entry-name = "smp2p";
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qcom,remote-pid = <7>;
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gpio-controller;
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#gpio-cells = <2>;
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interrupt-controller;
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#interrupt-cells = <2>;
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};
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/*
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* Maps outbound "smp2p" entry on remote PID 7 to client driver
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* "qcom,smp2pgpio_test_smp2p_7_out".
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*
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* Note: If all 32-pins are used by this client, then you
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* can just list pin 0 here as a shortcut.
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*/
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qcom,smp2pgpio_test_smp2p_7_out {
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compatible = "qcom,smp2pgpio_test_smp2p_7_out";
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gpios = <&smp2pgpio_smp2p_7_out 0 0>, /* pin 0 */
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<&smp2pgpio_smp2p_7_out 1 0>,
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. . .
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<&smp2pgpio_smp2p_7_out 31 0>; /* pin 31 */
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};
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