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PCI bus based UFS controller

Hi All,

Please share your valuable inputs on below queries.

1) Assume, our UFS controller is based on AMBA bus , next we are planning to migrate to PCI bus based controller.

    Can you share what are the steps to be taken for the support?

2) Linux kernel has support of PCI bus based UFS controller (file name : ufshcd-pci.c) . Do we need to customize/update this existing 

    code?

3) Else, Does the existing code work for any UFS controller irrespective of  UFS controller configuration.

4)  What is the relation between UFS controller interface and UFS controller driver?

Thanks

Murali.S