linux-kernel - Re: [RFC PATCH 0/5] omap: add ocp2scp as a misc driver

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Message-ID: <CAAe_U6LFFstds=iQ7cy7gM9vWbfRgf5z0gaRp_-bu0Qjx6eA1Q@mail.gmail.com>
Date:	Thu, 31 May 2012 13:44:04 +0530
From:	"ABRAHAM, KISHON VIJAY" <kishon@...com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	paul@...an.com, tony@...mide.com, linux@....linux.org.uk,
	b-cousson@...com, gregkh@...uxfoundation.org,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, balbi@...com
Subject: Re: [RFC PATCH 0/5] omap: add ocp2scp as a misc driver

Hi Arnd,

On Thu, May 31, 2012 at 12:13 AM, Arnd Bergmann <arnd@...db.de> wrote:
> On Wednesday 30 May 2012, Kishon Vijay Abraham I wrote:
>>
>> This patch series is done as a preparatory step for adding phy drivers
>> for dwc3 and musb.
>>
>> This series adds a new driver for ocp2scp to which phy drivers are connected.
>>
>> I'm planning to send phy drivers asap. Meanwhile I'd like to get some
>> review comments for this series. I have also plans to send device tree
>> adaptation of the ocp2scp driver.
>>
>> Developed on
>> http://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-next
>>
>> If it has to be based on some other tree, please let me know.
>
> This must be the most pointless driver I've seen in a long time. It doesn't
> actually do anything at all, it just creates child devices from a static
> lookup table.
>
> Just put the devices you actually want into the device tree instead and
> have them automatically created.

But shouldn't device tree support and non-device tree support co-exist
till the non-device tree is completely knocked out of the kernel? Even
then shouldn't there be a separate driver to extract the child nodes
of ocp2scp and create a device (using of_platform_populate)?
As far as I've seen, the devices are automatically created (by virtue
of of_platform_populate() in  mach-omap2/board-generic.c in omap case)
only for the devices that is connected to the system bus. For other
cases, the parent should be responsible for creating the child
devices.

Thanks
Kishon
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