# Re: \[PATCH v6 2/2\] staging: ion: create one device entry per heap

- From: Greg KH \<gregkh@linuxfoundation.org\>
- Date: 2017-11-02 10:43:57 
- List: linux-api
- Page: https://ratatoskr.run/linux-api/2017/11/5123259
- Thread: https://ratatoskr.run/dri-devel/2017/10/5116151/t.md

```text
On Tue, Oct 31, 2017 at 07:11:53PM +0000, Mark Brown wrote:
> On Tue, Oct 31, 2017 at 12:03:35PM -0700, Laura Abbott wrote:
> 
> > I'm not a fan of the platform bus but I have mixed feelings about
> > creating a dedicated bus type. I guess if we really need a bus
> > type we can do it later?
> 
> There was a discussion a while ago in the context of I2C/SPI MFDs
> which concluded that if you need a bus and it's going to be effectively
> noop then you should just use the platform bus as anything else will
> consist almost entirely of cut'n'paste from the platform bus with some
> light sed usage and code duplication is bad.  It's not super lovely as
> it's not actually a memory mapped device but it's the best idea we've
> got.

Ugh, I hate that.  What's wrong with using a "virtual" device instead?

I can create a "virtual" bus for things like this if they really want a
"simple" bus, abusing platform for this is the major reason I hate the
platform bus code...

thanks,

greg k-h
```