topic How to enable CAN Bus on MCIMX6QP-SDB in i.MX Processors

How to enable CAN Bus on MCIMX6QP-SDB

liu_jialu — Wed, 24 Jan 2018 08:58:17 GMT

How to enable CAN Bus on MCIMX6QP-SDB with L4.1.15_2.0.0, i modifiled the code like below, but it still can't work.

diff --git a/arch/arm/boot/dts/imx6qdl-sabresd.dtsi b/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
index 04ad185..9d0ff77 100644
--- a/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
@@ -295,6 +295,13 @@
    status = "okay";
};

+&can1 {
+   pinctrl-names = "default";
+   pinctrl-0 = <&pinctrl_flexcan1>;
+   can-stby-gpio = <&gpio4 5 GPIO_ACTIVE_LOW>;
+   status = "okay";
+};
+
&cpu0 {
    arm-supply = <&sw1a_reg>;
    soc-supply = <&sw1c_reg>;
@@ -700,6 +707,14 @@
            >;
        };

+       pinctrl_flexcan1: flexcan1grp {
+           fsl,pins = <
+               MX6QDL_PAD_GPIO_7__FLEXCAN1_TX       0x1b0b0
+               MX6QDL_PAD_GPIO_8__FLEXCAN1_RX       0x1b0b0
+               MX6QDL_PAD_GPIO_19__GPIO4_IO05          0x1b0b0 /* CAN_STBY */
+           >;
+       };
+
        pinctrl_gpio_keys: gpio_keysgrp {
            fsl,pins = <
                MX6QDL_PAD_EIM_D29__GPIO3_IO29 0x1b0b0

Re: How to enable CAN Bus on MCIMX6QP-SDB

liu_jialu — Wed, 24 Jan 2018 10:11:27 GMT

according to the thread: Unable to send CAN frames on imx6dlsabresd ,it works for me, patch like this:

diff --git a/arch/arm/boot/dts/imx6qdl-sabresd.dtsi b/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
index 04ad185..7f10a64 100644
--- a/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
@@ -130,6 +130,17 @@
            enable-active-high;
            hdmi-5v-supply = <&swbst_reg>;
        };
+
+       reg_can_xcvr: regulator@6 {
+           compatible = "regulator-fixed";
+           reg = <6>;
+           regulator-name = "CAN XCVR";
+           regulator-min-microvolt = <3300000>;
+           regulator-max-microvolt = <3300000>;
+           pinctrl-names = "default";
+           gpio = <&gpio4 5 GPIO_ACTIVE_HIGH>;
+           enable-active-low;
+       };

        reg_mipi_dsi_pwr_on: mipi_dsi_pwr_on {
            compatible = "regulator-fixed";
@@ -295,6 +306,14 @@
    status = "okay";
};

+&can1 {
+   pinctrl-names = "default";
+   pinctrl-0 = <&pinctrl_flexcan1>;
+   xceiver-supply = <&reg_can_xcvr>;
+//   can-stby-gpio = <&gpio4 5 0>;
+   status = "okay";
+};
+
&cpu0 {
    arm-supply = <&sw1a_reg>;
    soc-supply = <&sw1c_reg>;
@@ -700,6 +719,14 @@
            >;
        };

+       pinctrl_flexcan1: flexcan1grp {
+           fsl,pins = <
+               MX6QDL_PAD_GPIO_7__FLEXCAN1_TX       0x1b0b0
+               MX6QDL_PAD_GPIO_8__FLEXCAN1_RX       0x1b0b0
+               MX6QDL_PAD_GPIO_19__GPIO4_IO05          0x1b0b0
+           >;
+       };
+
        pinctrl_gpio_keys: gpio_keysgrp {
            fsl,pins = <
                MX6QDL_PAD_EIM_D29__GPIO3_IO29 0x1b0b0

Re: How to enable CAN Bus on MCIMX6QP-SDB

igorpadykov — Wed, 24 Jan 2018 10:28:23 GMT

Hi 家禄

for device tree settings one can look in

linux/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
and example in imx6qdl-sabreauto.dtsi :
http://git.freescale.com/git/cgit.cgi/imx/linux-imx.git/tree/arch/arm/boot/dts/imx6qdl-sabreauto.dtsi?h=imx_4.1.15_2.0.0_ga&id=rel_imx_4.1.15_2.0.0_ga

For testing please refer to Chapter 37 FlexCAN Driver attached Linux Manual.

Best regards
igor
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