Re: [Qemu-devel] [PATCH 0/5] Platform device support

From: Paolo Bonzini <pbonzini@redhat.com>
To: Peter Crosthwaite <peter.crosthwaite@xilinx.com>,
	Alexander Graf <agraf@suse.de>
Cc: qemu-ppc Mailing List <qemu-ppc@nongnu.org>,
	"qemu-devel@nongnu.org Developers" <qemu-devel@nongnu.org>,
	Eric Auger <eric.auger@linaro.org>
Subject: Re: [Qemu-devel] [PATCH 0/5] Platform device support
Date: Fri, 20 Jun 2014 09:39:01 +0200	[thread overview]
Message-ID: <53A3E515.10400@redhat.com> (raw)
In-Reply-To: <CAEgOgz4HjJqje4aGYORVY23R4fp=ng_i+BLLgEt1ra++LU5mBA@mail.gmail.com>

Il 20/06/2014 08:43, Peter Crosthwaite ha scritto:
> I think a big point of confusion here is you have picked a
> not-even-qdevified device for conversion. Boards are still calling
> serial_mm_init() directly due to lack of a proper device for Sysbus
> serial.
>
> Do you have another device that already QOMified (a MAC or something
> perhaps?) that you can convert more minimally to demonstrate the
> approach for existing sysbus devs?
>
> Sysbusification of serial would then be a step towards platform-device serial.

Indeed, I would first start with patches that make serial_mm_init a 
sysbus wrapper.  Then, with techniques similar to Peter's work, it 
should be possible to extend -device and do something like

    -device serial-mmio,memory.addr=0x1f000000,irq=gpio[5]

or something like that.

The only difference is whether you get the information from device tree 
or command line.

Paolo