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adnan_pasha
Visitor II
April 23, 2025
Solved

MIPI-DSI display configuration on STM32mp157DAC custom board

  • April 23, 2025
  • 1 reply
  • 762 views

Hi STM-Team,

We have the custom board based on the STM32MP157DAC board with KLD35176BVIB LCD display.
KLD35176BVIB is actually BOE3.49(VGA) + HX8394f  display.

We are using yocto build to configure the display panel changes.

I have attached my device tree configuration

1) I need to configure below pins.

Pin NamePin NumberFunctionImplementationRemarks
PA14T2TP_INTTouch Panel interruptReference design has only DSI_LCD_INT, combined for Display + TP
PD13AA19DSI_TEPin re-mapped FUNCTION MOVED FROM PC6 TO PD13
PD15J2DSI_LCD_BL_CTRLPin re-mapped Function moved from PA15
PH6Y11TP_RESET  


I was not able to find how and where to map these pins for my display panel As I am not much familiar with ST pin-mapping I was not able to figure out these mappings.

2) I was also looking for the DSI defaul data and clk pins pinmapping in device tree but not able to find it for below pins.

DSI_D0P
DSI_D0N
DSI_D1P
DSI_D1N
DSI_CK_P
DSI_CK_N
DSI_RESET
DSI_LCD_INT



3) Additionally is there a display driver available for KLD35176BVIB if yes how to enable it an use it to bring up our display LCD if no which alternative driver can we use since i can't find BOE+hx8394f driver in driver/gpu/drm/panel/ files.

4) I wanted to also know what is the best way to make and track device tree changes for linux-kernel,u-boot, and TFA. Since directly making changes in /tmp folder doesn't seem to be the best solution.

Thanks.



    This topic has been closed for replies.
    Best answer by adnan_pasha

    Hello,

    1.  

    • I have not configured the TE pin.

    • The backlight pin is configured using PWM.

    • The INT and RESET pins are configured and included in the touch panel configuration, which communicates over I2C.

      2.

    As far as I understand, these pins do not require explicit configuration because they are by default assigned for DSI display communication.

    3.

    I was able to get the display working by using the HX8394F driver from the Linux Git repository and adding the display initialization sequence provided by the display vendor.
    4.

    I used the devtool modify command to set up a workspace and track changes using Git commits.

    Thank you.

    1 reply

    A
    adnan_pashaAuthorAnswer
    Visitor II
    June 22, 2025

    Hello,

    1.  

    • I have not configured the TE pin.

    • The backlight pin is configured using PWM.

    • The INT and RESET pins are configured and included in the touch panel configuration, which communicates over I2C.

      2.

    As far as I understand, these pins do not require explicit configuration because they are by default assigned for DSI display communication.

    3.

    I was able to get the display working by using the HX8394F driver from the Linux Git repository and adding the display initialization sequence provided by the display vendor.
    4.

    I used the devtool modify command to set up a workspace and track changes using Git commits.

    Thank you.

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