linux-kernel - Re: [PATCH v4] scsi: ufs: add support of generic PHY and ICE in Qualcomm chips

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Message-ID: <5481C7F9.1020909@ti.com>
Date:	Fri, 5 Dec 2014 20:28:01 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Christoph Hellwig <hch@...radead.org>,
	Yaniv Gardi <ygardi@...eaurora.org>
CC:	<James.Bottomley@...senPartnership.com>,
	<linux-kernel@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
	<linux-arm-msm@...r.kernel.org>, <santoshsy@...il.com>,
	<linux-scsi-owner@...r.kernel.org>, <subhashj@...eaurora.org>,
	<noag@...eaurora.org>, <draviv@...eaurora.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Vinayak Holikatti <vinholikatti@...il.com>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	Grant Likely <grant.likely@...aro.org>,
	Christoph Hellwig <hch@....de>,
	Sujit Reddy Thumma <sthumma@...eaurora.org>,
	Raviv Shvili <rshvili@...eaurora.org>,
	Sahitya Tummala <stummala@...eaurora.org>,
	"open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>
Subject: Re: [PATCH v4] scsi: ufs: add support of generic PHY and ICE in Qualcomm
 chips



On Thursday 04 December 2014 09:24 PM, Christoph Hellwig wrote:
> On Thu, Nov 27, 2014 at 05:59:58PM +0200, Yaniv Gardi wrote:
>> In this change we add support to the generic PHY framework.
>> Two UFS phys are implemented:
>> qmp-20nm and qmp-28nm.
>>
>> Also, the files in this change implement the UFS HW (controller & PHY)
>> specific behavior in Qualcomm chips.
>> Relocation of a few header files is needed in order to expose routines
>> and data structures between PHY driver and UFS driver.
>>
>> Also, this change include the implementation of Inline Crypto Engine (ICE)
>> in Qualcomm chips.
> 
> This whole patch is a mess.  It does way to many things in one patch,
> and it doesn't explain enough of it.
> 
> Please explain why you need it.  Especially as the PHY API is a generic
> phy abstraction, so having to share defintions between the provider and
> consumer seems wrong.  Even if you need some shared bits keep them to an
> absolute minium insted of moving so much out of the driver directory.
> Also if at all possible keep the shared data in a single header under
> include/linux instead of having lots of global headers in a deep
> directory structure.
> 
> Second split this into patches that do a single things, and explain why
> you're doing each:
> 
>  1) header move if/as needed
>  2) add 20nm phy driver
>  3) add 28nm phy driver
>  4) add ufs-qcom driver
>  5) add ufs-qcom-ice support
> 
> and so on.

+1

-Kishon
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