writing a dts file for porting a CYW43455 wifi/bt module on imx8mevk

[ysandeepkumar07]

Hi All,

I am trying to port cyw43455 wifi/bt on imx8mevk. I am able to figure out dts node for bluetooth porting pins but confused when porting wifi related configurations.

Below are the pin and port details I am using

wifi --> sdio

BT --> UART3.

HMI NET NAME	IMX8 Pin name
BT_REG_ON	NAND_CLE
WL_REG_ON	NAND_CE2_B
BT_HOST_WAKE	NAND_DQS
BT_DEV_WAKE	NAND_CE1_B
REF_CLK_32K	GPIO1_IO00
SD1_CMD	SD1_CMD
SD1_DATA0	SD1_DATA0
SD1_DATA1	SD1_DATA1
SD1_DATA2	SD1_DATA2
SD1_DATA3	SD1_DATA3
SD1_CLK	SD1_CLK
UART3_RXD	UART3_RXD
UART3_TXD	UART3_TXD
UART3_CTS	UART3_RXD
UART3_RTS	UART3_TXD
SAI5_RXD1	L4
SAI3_TXFS	G3
SAI3_TXC	C4
SAI3_TXD	C3
SAI3_RXD	F3

Here we are using both 1.8v for VIO and 3.3v for VBAT_LDO, but I don't have any clue how to configure VIO and VBAT in dts file. Please find attached dts prepared for above configuration. Please correct me if anything is wrong and help me how to add vio and vbat configuration in dts.

[romitchatterjee]

I find the same question at the Cypress forum (https://community.cypress.com/message/171931) has been answered correctly already.

[romitchatterjee]

Hello,

Have a look at Embedded Artists’ dts file on their github (https://github.com/embeddedartists/linux-imx/blob/ea_4.14.78/arch/arm64/boot/dts/freescale/fsl-imx8m...). Murata 1MW SDIO mode works fine with their IMX8MQ board.

You might also take a look at this post: https://community.nxp.com/thread/491236.

[janakiram_sistl]

Hi Sandeep,

Am in same boat as you trying to bring up my sdio device , were you able to get the dts correct  for the wifi?  ok if you can share for a comparison.

Regards,
Sistla.

[janakiram_sistl]

Am able to resolve this issue after finding and resolving issues on the SDIO device side