TMDX654IDKEVM: I2C LED controler

Silviu Balan

Part Number: TMDX654IDKEVM
Other Parts Discussed in Thread: TPIC2810, PCA9555

Hello,

I'm trying to write a simple C application that controls this TPIC2810D (LED controller) in Linux.

Can you tell me what drivers do I need? Do I need to add additional modules in the Linux Makefile and compile again? And if yes, where do I modify the makefile?

Best regards!

over 7 years ago

0 Pavel Botev over 7 years ago

TI__Guru**** 170625 points

Hi Silviu,

You need the below driver:

linux-4.19.38/drivers/gpio/gpio-tpic2810.c

This driver is build as module from the am65x defconfig file, thus you need to include it in the kernel:

linux-4.19.38/arch/arm64/configs/tisdk_am65xx-evm_defconfig

CONFIG_GPIO_TPIC2810=m

You need also to include tpic2810 in AM65x DTS file, in the main_i2c0 node, similar like pca9555 node.

linux-4.19.38/arch/arm64/boot/dts/ti/k3-am654-base-board.dts

&main_i2c0 {
   pinctrl-names = "default";
   pinctrl-0 = <&main_i2c0_pins_default>;
   clock-frequency = <400000>;

   pca9555: gpio@21 {
       compatible = "nxp,pca9555";
       reg = <0x21>;
       gpio-controller;
       #gpio-cells = <2>;
   };
};

Check also below txt file:

linux-4.19.38/Documentation/devicetree/bindings/gpio/gpio-tpic2810.txt

Regards,
Pavel

0 Silviu Balan over 7 years ago in reply to Pavel Botev

Expert 1620 points

Hello,

Thanks for your response.

Can I build the Linux Kernel without Yocto?

Best regards!

Processors

Processors forum

TMDX654IDKEVM: I2C LED controler