bindings: can: Add device-tree bindings for qti-can driver

* QTI CAN driver *

Required properties:

  - compatible: Should be "qcom,renesas,rh850" or "qcom,nxp,mpc5746c".

  - reg: Should contain SPI chip select.

  - interrupt-parent: Should specify interrupt controller for the interrupt.

  - interrupts: Should contain IRQ line for the CAN controller.

  - spi-max-frequency: Should contain maximum spi clock frequency for slave device

  - qcom,clk-freq-mhz : The frequency at which the CAN clock should be configured.

  - qcom,max-can-channels : Maximum number of CAN channels supported by the controller.

Optional properties:

  - qcom,reset-gpio: Reference to the GPIO connected to the reset input.

  - pinctrl-names : Names corresponding to the numbered pinctrl states.

  - pinctrl-0 : This explains the active state of the GPIO line.

  - pinctrl-1 : This explains the suspend state of the GPIO line.

  - qcom,bits-per-word: Indicate how many bits are in a SPI frame. e.g.: 8, 16, 32.

                   Default to 16.

  - qcom,reset-delay-msec: Delay in milliseconds to be applied after resetting the chip.

    This is applicable only if the reset-gpio is specified. Default value is 1 ms.

  - qcom,support-can-fd: Whether CAN FD mode is supported or not.

  - qcom,can-fw-cmd-timeout-req: Whether a timeout is required if we don't get a response from

    the firmware after flash write.

  - qcom,can-fw-cmd-timeout-ms: The duration after which timeout will happen if we don't get a

    response from the firmware.

  - qcom,rem-all-buffering-timeout-ms: The duration after which timeout will happen if we don't get a

    response from the firmware while trying to remove all the buffered frames IDs from flash.

Example:

can-controller@0 {

	compatible = "qcom,nxp,mpc5746c";

	reg = <0>;

	spi-max-frequency = <9600000>;

	interrupt-parent = <&tlmm_pinmux>;

	interrupts = <87 0>;

	qcom,reset-gpio = <&tlmm_pinmux 89 0x1>;

	qcom,clk-freq-mhz = <20000000>;

	qcom,max-can-channels = <2>;

	qcom,bits-per-word = <8>;

	qcom,reset-delay-msec = <150>;

	qcom,can-fw-cmd-timeout-req;

	qcom,can-fw-cmd-timeout-ms = <400>;

	qcom,rem-all-buffering-timeout-ms = <2000>;

	pinctrl-names = "active", "sleep";

	pinctrl-0 = <&can_rst_on>;

	pinctrl-1 = <&can_rst_off>;

};