linux-kernel - Re: [PATCH v2 2/5] phy: qcom: Add Qualcomm PCIe PHY

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Date:	Wed, 20 May 2015 18:38:19 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Stanimir Varbanov <svarbanov@...sol.com>
CC:	Rob Herring <robh+dt@...nel.org>,
	Kumar Gala <galak@...eaurora.org>,
	Mark Rutland <mark.rutland@....com>,
	Grant Likely <grant.likely@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>, <linux-arm-msm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<devicetree@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	Mathieu Olivari <mathieu@...eaurora.org>,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: Re: [PATCH v2 2/5] phy: qcom: Add Qualcomm PCIe PHY

Hi Bjorn,

On Wednesday 20 May 2015 04:11 AM, Bjorn Helgaas wrote:
> On Mon, May 04, 2015 at 06:24:10PM +0300, Stanimir Varbanov wrote:
>> On 05/04/2015 05:35 PM, Kishon Vijay Abraham I wrote:
>>> Hi,
>>>
>>> On Monday 04 May 2015 06:12 PM, Stanimir Varbanov wrote:
>>>> Add a PCIe PHY driver used by PCIe host controller driver
>>>> on Qualcomm SoCs like Snapdragon 805.
>>>>
>>>> Signed-off-by: Stanimir Varbanov <svarbanov@...sol.com>
>>>> ---
>>>>    drivers/phy/Kconfig         |    9 ++
>>>>    drivers/phy/Makefile        |    1 +
>>>>    drivers/phy/phy-qcom-pcie.c |  291
>>>> +++++++++++++++++++++++++++++++++++++++++++
>>>
>>> Why do you need a new PHY driver for this? Why not use the existing QCOM
>>> PHY driver. I can see the registers used here in phy-qcom-ufs-qmp-14nm.h?
>>
>> I agree that on first glance there are similarities, but I'm not sure
>> does the PHYs are the same IP blocks. Or at least they are different
>> revisions which have too many differences. So trying to combine them
>> will lead to more code than now.
>>
>> Either way I will try to understand how many the differences are.
>
> Ping, where are we with this?  Should I wait for something else, or are you
> convinced there's enough difference to warrant a new PHY driver, Kishon?

I'd like to wait to see if Stanimir can use existing driver instead of creating 
a new driver.

Cheers
Kishon
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