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[FAQ] CCS/TDA4VM/J721e/J7200: How to enable RTC on Jacinto TDA4x EVM?

Keerthy J
Guru**** 165700 points
Part Number: TDA4VM


Tool/software: Code Composer Studio

MCP79410-I/SN is connected I2C0 interface of J721E SoC. How to enable the same?

  • 0
    TI__Guru**** 165700 points

    Hi,

    Following changes are needed:

    J721e:/TDA4VM

    1. CONFIG enabling. The driver supporting MCP79410 RTC is drivers/rtc/rtc-ds1307.c.
      CONFIG_RTC_DRV_DS1307 needs to be enabled.

      Add CONFIG_RTC_DRV_DS1307=y to arch/arm64/configs/tisdk_j7-evm_defconfig under linux folder.

    2. DTS changes as below:

      diff --git a/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts b/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts
index 6788a3611..9d642eb7a 100644
--- a/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts
+++ b/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts
@@ -593,6 +593,11 @@
                #gpio-cells = <2>;
        };

+       rtc@6f {
+               compatible = "microchip,mcp7941x";
+               reg = <0x6f>;
+       };
+
        exp2: gpio@22 {
                compatible = "ti,tca6424";
                reg = <0x22>;

    3. Once you have made the changes in the defconfig & the dts files. All you need to do is:

      make linux

      then copy the kernel and DT binaries to your rootfs:

      cp $SDK_INSTALL_DIR:/board-support/linux*/arch/arm64/boot/Image $SDK_INSTALL_DIR:/board-support/linux*/arch/arm64/boot/dts/ti/k3-j721e-common-porc-board.dtb /media/$USER/rootfs/boot

      J7200:

      1. CONFIG enabling. The driver supporting MCP79410 RTC is drivers/rtc/rtc-ds1307.c.
        CONFIG_RTC_DRV_DS1307 needs to be enabled.

        Add CONFIG_RTC_DRV_DS1307=y to arch/arm64/configs/tisdk_j7200-evm_defconfig under linux folder.

      2. DTS changes as below:

        diff --git a/arch/arm64/boot/dts/ti/k3-j7200-common-proc-board.dts b/arch/arm64/boot/dts/ti/k3-j7200-common-proc-board.dts
index 6788a3611..9d642eb7a 100644
--- a/arch/arm64/boot/dts/ti/k3-j7200-common-proc-board.dts
+++ b/arch/arm64/boot/dts/ti/k3-j7200-common-proc-board.dts
@@ -593,6 +593,11 @@
                #gpio-cells = <2>;
        };

+       rtc@6f {
+               compatible = "microchip,mcp7941x";
+               reg = <0x6f>;
+       };
+
        exp2: gpio@22 {
                compatible = "ti,tca6424";
                reg = <0x22>;

      3. Once you have made the changes in the defconfig & the dts files. All you need to do is:

        make linux

        then copy the kernel and DT binaries to your rootfs:

        cp $SDK_INSTALL_DIR:/board-support/linux*/arch/arm64/boot/Image $SDK_INSTALL_DIR:/board-support/linux*/arch/arm64/boot/dts/ti/k3-j7200-common-porc-board.dtb /media/$USER/rootfs/boot


      Best Regards,
      Keerthy