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Device tree and passing parameter to serial driver from specyfic device overlay

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}

0

I would like to pass linux,rs485-enabled-at-boot-time; flag/parameter to serial port driver configuration for sc16is752 device defined by this device tree overlay (unmodified file from Raspbian):

/dts-v1/;

/plugin/;



/ {

    compatible = "brcm,bcm2835";



    fragment@0 {

        target = <&gpio>;

        __overlay__ {

            spi1_pins: spi1_pins {

                brcm,pins = <19 20 21>;

                brcm,function = <3>; /* alt4 */

            };



            spi1_cs_pins: spi1_cs_pins {

                brcm,pins = <18>;

                brcm,function = <1>; /* output */

            };

        };

    };



    fragment@1 {

        target = <&spi1>;

        frag1: __overlay__ {

            #address-cells = <1>;

            #size-cells = <0>;

            pinctrl-names = "default";

            pinctrl-0 = <&spi1_pins &spi1_cs_pins>;

            cs-gpios = <&gpio 18 1>;

            status = "okay";





            sc16is752: sc16is752@0 {

                compatible = "nxp,sc16is752";

                reg = <0>; /* CE0 */

                clocks = <&sc16is752_clk>;

                interrupt-parent = <&gpio>;

                interrupts = <24 2>; /* IRQ_TYPE_EDGE_FALLING */

                gpio-controller;

                gpio-cells = <2>;

                spi-max-frequency = <4000000>;



                sc16is752_clk: sc16is752_clk {

                    compatible = "fixed-clock";

                    #clock-cells = <0>;

                    clock-frequency = <14745600>;

                };

            };

        };

    };



    fragment@2 {

        target = <&aux>;

        __overlay__ {

            status = "okay";

        };

    };



    __overrides__ {

      int_pin = <&sc16is752>,"interrupts:0";

    };

};

SC16IS752 is a chip with few GPIO pins and two UART interfaces with hardware RS485 support, and Linux driver for SC16IS752 can enable it:

https://github.com/raspberrypi/linux/blob/04c8e47067d4873c584395e5cb260b4f170a99ea/drivers/tty/serial/sc16is7xx.c#L729 (see line 729).

Device tree bindings for SC16IS752 have no such parameter, so I guess I can't just add linux,rs485-enabled-at-boot-time; inside sc16is752: sc16is752@0 node.

How can I pass that?

device-tree

share|improve this question

asked 7 hours ago

KamilKamil

19244 silver badges1616 bronze badges

add a comment | 

0

I would like to pass linux,rs485-enabled-at-boot-time; flag/parameter to serial port driver configuration for sc16is752 device defined by this device tree overlay (unmodified file from Raspbian):

/dts-v1/;

/plugin/;



/ {

    compatible = "brcm,bcm2835";



    fragment@0 {

        target = <&gpio>;

        __overlay__ {

            spi1_pins: spi1_pins {

                brcm,pins = <19 20 21>;

                brcm,function = <3>; /* alt4 */

            };



            spi1_cs_pins: spi1_cs_pins {

                brcm,pins = <18>;

                brcm,function = <1>; /* output */

            };

        };

    };



    fragment@1 {

        target = <&spi1>;

        frag1: __overlay__ {

            #address-cells = <1>;

            #size-cells = <0>;

            pinctrl-names = "default";

            pinctrl-0 = <&spi1_pins &spi1_cs_pins>;

            cs-gpios = <&gpio 18 1>;

            status = "okay";





            sc16is752: sc16is752@0 {

                compatible = "nxp,sc16is752";

                reg = <0>; /* CE0 */

                clocks = <&sc16is752_clk>;

                interrupt-parent = <&gpio>;

                interrupts = <24 2>; /* IRQ_TYPE_EDGE_FALLING */

                gpio-controller;

                gpio-cells = <2>;

                spi-max-frequency = <4000000>;



                sc16is752_clk: sc16is752_clk {

                    compatible = "fixed-clock";

                    #clock-cells = <0>;

                    clock-frequency = <14745600>;

                };

            };

        };

    };



    fragment@2 {

        target = <&aux>;

        __overlay__ {

            status = "okay";

        };

    };



    __overrides__ {

      int_pin = <&sc16is752>,"interrupts:0";

    };

};

SC16IS752 is a chip with few GPIO pins and two UART interfaces with hardware RS485 support, and Linux driver for SC16IS752 can enable it:

https://github.com/raspberrypi/linux/blob/04c8e47067d4873c584395e5cb260b4f170a99ea/drivers/tty/serial/sc16is7xx.c#L729 (see line 729).

Device tree bindings for SC16IS752 have no such parameter, so I guess I can't just add linux,rs485-enabled-at-boot-time; inside sc16is752: sc16is752@0 node.

How can I pass that?

device-tree

share|improve this question

asked 7 hours ago

KamilKamil

19244 silver badges1616 bronze badges

add a comment | 

I would like to pass linux,rs485-enabled-at-boot-time; flag/parameter to serial port driver configuration for sc16is752 device defined by this device tree overlay (unmodified file from Raspbian):

/dts-v1/;

/plugin/;



/ {

    compatible = "brcm,bcm2835";



    fragment@0 {

        target = <&gpio>;

        __overlay__ {

            spi1_pins: spi1_pins {

                brcm,pins = <19 20 21>;

                brcm,function = <3>; /* alt4 */

            };



            spi1_cs_pins: spi1_cs_pins {

                brcm,pins = <18>;

                brcm,function = <1>; /* output */

            };

        };

    };



    fragment@1 {

        target = <&spi1>;

        frag1: __overlay__ {

            #address-cells = <1>;

            #size-cells = <0>;

            pinctrl-names = "default";

            pinctrl-0 = <&spi1_pins &spi1_cs_pins>;

            cs-gpios = <&gpio 18 1>;

            status = "okay";





            sc16is752: sc16is752@0 {

                compatible = "nxp,sc16is752";

                reg = <0>; /* CE0 */

                clocks = <&sc16is752_clk>;

                interrupt-parent = <&gpio>;

                interrupts = <24 2>; /* IRQ_TYPE_EDGE_FALLING */

                gpio-controller;

                gpio-cells = <2>;

                spi-max-frequency = <4000000>;



                sc16is752_clk: sc16is752_clk {

                    compatible = "fixed-clock";

                    #clock-cells = <0>;

                    clock-frequency = <14745600>;

                };

            };

        };

    };



    fragment@2 {

        target = <&aux>;

        __overlay__ {

            status = "okay";

        };

    };



    __overrides__ {

      int_pin = <&sc16is752>,"interrupts:0";

    };

};

SC16IS752 is a chip with few GPIO pins and two UART interfaces with hardware RS485 support, and Linux driver for SC16IS752 can enable it:

https://github.com/raspberrypi/linux/blob/04c8e47067d4873c584395e5cb260b4f170a99ea/drivers/tty/serial/sc16is7xx.c#L729 (see line 729).

Device tree bindings for SC16IS752 have no such parameter, so I guess I can't just add linux,rs485-enabled-at-boot-time; inside sc16is752: sc16is752@0 node.

How can I pass that?

device-tree

share|improve this question

asked 7 hours ago

KamilKamil

19244 silver badges1616 bronze badges

/dts-v1/;

/plugin/;



/ {

    compatible = "brcm,bcm2835";



    fragment@0 {

        target = <&gpio>;

        __overlay__ {

            spi1_pins: spi1_pins {

                brcm,pins = <19 20 21>;

                brcm,function = <3>; /* alt4 */

            };



            spi1_cs_pins: spi1_cs_pins {

                brcm,pins = <18>;

                brcm,function = <1>; /* output */

            };

        };

    };



    fragment@1 {

        target = <&spi1>;

        frag1: __overlay__ {

            #address-cells = <1>;

            #size-cells = <0>;

            pinctrl-names = "default";

            pinctrl-0 = <&spi1_pins &spi1_cs_pins>;

            cs-gpios = <&gpio 18 1>;

            status = "okay";





            sc16is752: sc16is752@0 {

                compatible = "nxp,sc16is752";

                reg = <0>; /* CE0 */

                clocks = <&sc16is752_clk>;

                interrupt-parent = <&gpio>;

                interrupts = <24 2>; /* IRQ_TYPE_EDGE_FALLING */

                gpio-controller;

                gpio-cells = <2>;

                spi-max-frequency = <4000000>;



                sc16is752_clk: sc16is752_clk {

                    compatible = "fixed-clock";

                    #clock-cells = <0>;

                    clock-frequency = <14745600>;

                };

            };

        };

    };



    fragment@2 {

        target = <&aux>;

        __overlay__ {

            status = "okay";

        };

    };



    __overrides__ {

      int_pin = <&sc16is752>,"interrupts:0";

    };

};

share|improve this question

asked 7 hours ago

KamilKamil

19244 silver badges1616 bronze badges

share|improve this question

asked 7 hours ago

KamilKamil

19244 silver badges1616 bronze badges

asked 7 hours ago

KamilKamil

19244 silver badges1616 bronze badges

asked 7 hours ago

KamilKamil

19244 silver badges1616 bronze badges