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

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Date:   Mon, 26 Feb 2018 11:53:48 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     John Garry <john.garry@...wei.com>, gregkh@...uxfoundation.org,
        jslaby@...e.com, p.zabel@...gutronix.de, heiko@...ech.de,
        ed.blake@...drel.com, jhogan@...nel.org
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxarm@...wei.com
Subject: Re: [RFC PATCH 0/2] serial: 8250_dw: IO space + polling mode support

On Mon, 2018-02-26 at 09:33 +0000, John Garry wrote:
> On 23/02/2018 17:31, Andy Shevchenko wrote:
> > On Fri, 2018-02-23 at 11:02 +0000, John Garry wrote:
> > > On 23/02/2018 10:30, Andy Shevchenko wrote:
> > > > On Fri, 2018-02-23 at 02:42 +0800, John Garry wrote:

> > > 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.

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy