Re: [RFC PATCH 0/2] serial: 8250_dw: IO space + polling mode support

[John Garry]

Hi Andy,

> > > > We require it for a development board for our hip06 platform.
> > >
> > > Okay, and this particular platform uses Synopsys IP?
> >
> > As I see this uart is really a virtual 8250, so HW details like apb
> > clocks and the like are hidden, so may not be relevant.
>
> Good to know.
>
> > However I will check with the BMC team to know the specific details.
>
> > > > > >  for supporting an 8250-compatible UART with
> > > > > > the following profile/features:
> > > > > > - platform device
> > > > > > - polling mode (i.e. no interrupt support)
> > > > > > - ACPI FW
> > > > >
> > > > > Elaborate this one, please.
> > > >
> > > > So we need to define our own HID here, and cannot use PNP
> > > > compatible
> > > > CID
> > > > (like PNP0501) as we cannot use the 8250 PNP driver.
> > >
> > > Why not? What are the impediments?
> >
> > To support the host controller for this device, we will create an
> > MFD,
> > i.e. platform device, per slave device.
>
> There is no answer here...
>
> > > > This is related to the Hisi LPC ACPI support, where we would
> > > > create
> > > > an
> > > > MFD (i.e. platform device) for the UART.
> > >
> > > Why you can't do properly in ACPI?
>
> No answer here either.
>
> Sorry, but with this level of communication it's no go for the series.

Sorry if my answers did not tell you want you want to know.

My point was that the 8250_pnp driver would be used for a pnp_device, 
but we are creating a platform device for this UART slave so would 
require a platform device driver, that which 8250_dw.c is. But I will 
check on pnp device support.

Much appreciated,
John