BPI M2 brcmfmac problem

Hello, guys,

I am building mainline "next" for BananaPi M2 with my custom Waveshare 35a dt overlay (source attached) created from the one for RaspberryPi3.  The display shows a broken picture. DMESG periodically shows SPI transfer error -110. Any ideas what is going on there ? I am using a similar DTS on OrangePi PC and it works  perfectly.

Thanks in advance for any help or idea.

DMESG output

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[    8.027465] fbtft: module is from the staging directory, the quality is unknown, you have been warned.
[    8.030428] fb_ili9486: module is from the staging directory, the quality is unknown, you have been warned.
[    8.031067] fbtft_of_value: regwidth = 16
[    8.031073] fbtft_of_value: buswidth = 8
[    8.031079] fbtft_of_value: debug = 0
[    8.031083] fbtft_of_value: rotate = 90
[    8.031087] fbtft_of_value: fps = 30
[    8.031091] fbtft_of_value: txbuflen = 65536
 

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[  133.380029] spi_master spi32766: spi32766.0: timeout transferring 15360 bytes@16000000Hz for 110(100)ms
[  133.380037] fb_ili9486 spi32766.0: SPI transfer failed: -110
[  133.380047] spi_master spi32766: failed to transfer one message from queue
[  133.380054] fb_ili9486 spi32766.0: fbtft_update_display: write_vmem failed to update display buffer
 

sun6i-a31-waveshare35a.dts

sun8i-h3-waveshare35a.dts