how to add new device in dts for uart

[srinivasaporam]

Hi,

We have IMX6 board, for which we are connecting some sensor at UART. If we are connecting to i2c /SPI. then we are are defining them in device tree like this:

i2c3: i2c@021a8000 {

                #address-cells = <1>;

                #size-cells = <0>;

                compatible = "fsl,imx6q-i2c", "fsl,imx21-i2c";

                reg = <0x021a8000 0x4000>;

                interrupts = <0 38 IRQ_TYPE_LEVEL_HIGH>;

                clocks = <&clks IMX6QDL_CLK_I2C3>;

                status = "okay";

               devicename@0xab {

                    compatible = "meas-spec,ms5803";

                    reg = <0xab>;

                };

  };

for SPI:

ecspi1: ecspi@02008000 {

                    #address-cells = <1>;

                    #size-cells = <0>;

                    compatible = "fsl,imx6q-ecspi", "fsl,imx51-ecspi";

                    reg = <0x02008000 0x4000>;

                    interrupts = <0 31 IRQ_TYPE_LEVEL_HIGH>;

                    clocks = <&clks IMX6QDL_CLK_ECSPI1>,

                         <&clks IMX6QDL_CLK_ECSPI1>;

                    clock-names = "ipg", "per";

                    dmas = <&sdma 3 7 1>, <&sdma 4 7 2>;

                    dma-names = "rx", "tx";

                    cs-gpios = <&gpio2 30 0>;

                    fsl,spi-num-chipselects = <1>;

                    status = "okay";

                    devicename@x {

                       compatible = "spidev";

                       reg = <x>;

                       spi-max-frequency = <20000000>;

                          };

like wise how to define for UART. is it necessary???

[srinivasaporam]

Hi,

in the example you have given

linux-2.6-imx.git - Freescale i.MX Linux Tree

&uart3 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_uart3_1>;
pinctrl-assert-gpios = <&max7310_b 4 GPIO_ACTIVE_HIGH>, /* CTS */
<&max7310_c 3 GPIO_ACTIVE_HIGH>; /* RXD and TXD */
fsl,uart-has-rtscts;
status = "okay";
/* for DTE mode, add below change */
/* fsl,dte-mode; */
/* pinctrl-0 = <&pinctrl_uart3dte_1>; */
};

uart3 is connected through max7310 which is connected to gpio.

But in our case, we are directly connecting a device/sensor to uart. then in that case how use it in device tree.

[igorpadykov]

below uart3 is not connected through max7310 which is connected to gpio

linux-imx6/imx6qdl-nitrogen6x.dtsi at boundary-imx_3.14.28_1.0.0_ga · boundarydevices/linux-imx6 · G...

[igorpadykov]

Hi Srinivasa

for uart example one can look at sabre ai board BT_WIFI_UART3

linux-2.6-imx.git - Freescale i.MX Linux Tree

linux-2.6-imx.git - Freescale i.MX Linux Tree

http://boundarydevices.com/mx6-device-tree-customization/

Best regards

igor

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