linux-kernel - Re: [PATCH v1 0/2] Common SerDes driver for TI's Keystone Platforms

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Date:	Fri, 16 Oct 2015 10:10:58 -0400
From:	Murali Karicheri <m-karicheri2@...com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Rob Herring <robh+dt@...nel.org>
CC:	WingMan Kwok <w-kwok2@...com>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Kishon Vijay Abraham I <kishon@...com>,
	Roger Quadros <rogerq@...com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Santosh Shilimkar <ssantosh@...nel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v1 0/2] Common SerDes driver for TI's Keystone Platforms

On 10/16/2015 04:02 AM, Russell King - ARM Linux wrote:
> On Thu, Oct 15, 2015 at 08:00:41PM -0500, Rob Herring wrote:
>> On Thu, Oct 15, 2015 at 11:51 AM, Russell King - ARM Linux
>> <linux@....linux.org.uk> wrote:
>>> On Thu, Oct 15, 2015 at 10:25:43AM -0400, WingMan Kwok wrote:
>>>> On TI's Keystone platforms, several peripherals such as the
>>>> gbe ethernet switch, 10gbe ethether switch and PCIe controller
>>>> require the use of a SerDes for converting SoC parallel data into
>>>> serialized data that can be output over a high-speed electrical
>>>> interface, and also converting high-speed serial input data
>>>> into parallel data that can be processed by the SoC.  The
>>>> SerDeses used by those peripherals, though they may be different,
>>>> are largely similar in functionality and setup.
>>>
>>> Given that serdes is not specific to TI, should this be specific to
>>> TI, or should there be an effort to come up with something which
>>> everyone who has serdes links can make use of?
>>>
Russell,

The serdes on K2 are re-used on multiple hardware blocks as already 
indicated in this thread. It has got multiple lanes, each lane can be 
enabled/disabled, shutdown etc. Isn't generic phy framework added to 
support this type of hardware block? I see some enhancements needed for 
K2 serdes to support monitoring the serdes link and providing a status 
to the higher layer device. So I am not clear what different way you 
would like to handle serdes drivers? Why do you need a new framework?

Murali
>>> Serdes comes in multiple different forms: PCIe, 1G SGMII ethernet,
>>> 1000base-X ethernet, 10g ethernet, SATA... I'd hate to see a
>>> plethora of SoC specific stuff for this.
>>
>> The licensed IP I've seen doesn't provide a standard register
>> interface, but just signals to the IP block. Same with PLL IP. So
>> we'll probably get to see vendors continue to differentiate on PHY
>> register design. :)
>
> So what?  Network drivers differ radically in register design, yet we
> still have a standardised interface to network drivers.
>


-- 
Murali Karicheri
Linux Kernel, Keystone
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