PROCESSOR-SDK-DRA8X-TDA4X: enabling RTC on Jacinto TDA4x EVM

There is a battery socket on EVM.

Do you mean that battery socket is assembled and RTC chip is not assembled?

According to EVM User Guide (SPRUIS4A–December 2019–Revised May 2020), Para. 4.22 RTC Interface:

> A real-time clock module Mfr. Part# MCP79410-I/SN is connected I2C0 interface of J721E SoC.

Hi MIchael,

As i commented above i meant there is on no chip or on die RTC on the SoC(My bad I have told EVM).

The compatible for MCP79410 is microchip,mcp7941x & the config that needs to be enabled is CONFIG_RTC_DRV_DS1307.
However that alone is not sufficient you even need to add the dts node. This is not supported on the SDK 7.0.

I  will get back with more details on this after checking internally. .

Best Regards,
Keerthy

Hi Keerthy,

Any details on required dts node?

Hi Michael,

Can you try the below diff:

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>;

Best Regards,
Keerthy