Re: [RESEND PATCH v18 0/3] userspace MHI client interface driver

On Tue, 2 Feb 2021 09:52:08 +0530 Manivannan Sadhasivam wrote:

quoted

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I don't see the connection here, sorry.

For instance USB_NET_CDC_MBIM driver creates the /dev/cdc-wdmX chardev node for
configuring the modems which supports MBIM protocol over USB. Like that, this
driver creates /dev/mhiX_MBIM chardev node for configuring the modem over MHI
bus instead of USB. The question arised why we are creating a chardev node for
each supported configuration (channels in the case of MHI) and why can't we use
the existing /dev/cdc-wdmZ interfaces? The anwser is there is no standard
subsystem for WWAN and all the drivers represent a chardev which gets used by
the userspace tools such a Network manager for establishing connection.

And /dev/cdc-wdmX is restricted to the USB CDC devices.

Hope this clarifies!

Jakub, Dave, Adding you both to get your reviews on this series. I've
provided an explanation above and in the previous iteration [1].

Let's be clear what the review would be for. Yet another QMI chardev 
or the "UCI" direct generic user space to firmware pipe?