Is it possible that implement the SDIO with 1-bit and 4-bit modebased on GPIO within kernel ?

[peter.meng]

Hi

I just fond that the kernel implemented the SDIO with SPI mode based
on GPIO , but can't support 1-bit and 4-bit mode .
Is it possible that implement the SDIO with 1-bit and 4-bit mode based
on GPIO within kernel ?
If it yes please give me suggestion how to do it ?


Thank a lot .
Best Regards .
Peter Meng
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