linux-kernel - Re: [PATCH v3 6/8] scsi: ufs: make the UFS variant a platform device

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Message-ID: <c07dbe55ff782a2323cc053d89d49480.squirrel@www.codeaurora.org>
Date:	Sun, 30 Aug 2015 08:43:50 -0000
From:	ygardi@...eaurora.org
To:	"Rob Herring" <robherring2@...il.com>
Cc:	"Yaniv Gardi" <ygardi@...eaurora.org>,
	"Jej B" <james.bottomley@...senpartnership.com>,
	"Paul Bolle" <pebolle@...cali.nl>, hch@...radead.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-scsi@...r.kernel.org,
	"linux-arm-msm" <linux-arm-msm@...r.kernel.org>,
	"Santosh Y" <santoshsy@...il.com>,
	linux-scsi-owner@...r.kernel.org,
	"Subhash Jadavani" <subhashj@...eaurora.org>,
	"Gilad Broner" <gbroner@...eaurora.org>,
	"Dolev Raviv" <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@...n.com>,
	"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 FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@...r.kernel.org>
Subject: Re: [PATCH v3 6/8] scsi: ufs: make the UFS variant a platform
 device

> On Sun, Aug 23, 2015 at 8:09 AM, Yaniv Gardi <ygardi@...eaurora.org>
> wrote:
>> This change turns the UFS variant (SCSI_UFS_QCOM) into a UFS
>> a platform device.
>> In order to do so a few additional changes are required:
>> 1. The ufshcd-pltfrm is no longer serves as a platform device.
>>    Now it only serves as a group of platform APIs such as PM APIs
>>    (runtime suspend/resume, system suspend/resume etc), parsers of
>>    clocks, regulators and pm_levels from DT.
>> 2. What used to be the old platform "probe" is now "only"
>>    a pltfrm_init() routine, that does exactly the same, but only
>>    being called by the new probe function of the UFS variant.
>>
>> Signed-off-by: Yaniv Gardi <ygardi@...eaurora.org>
>>
>> ---
>>  .../devicetree/bindings/ufs/ufshcd-pltfrm.txt      |  2 +-
>>  drivers/scsi/ufs/ufs-qcom.c                        | 78
>> +++++++++++++++++-
>>  drivers/scsi/ufs/ufshcd-pltfrm.c                   | 92
>> ++++++----------------
>>  drivers/scsi/ufs/ufshcd-pltfrm.h                   | 41 ++++++++++
>>  drivers/scsi/ufs/ufshcd.c                          | 10 +++
>>  drivers/scsi/ufs/ufshcd.h                          |  1 +
>>  6 files changed, 152 insertions(+), 72 deletions(-)
>>  create mode 100644 drivers/scsi/ufs/ufshcd-pltfrm.h
>>
>> diff --git a/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
>> b/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
>> index 5357919..b39e765 100644
>> --- a/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
>> +++ b/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
>> @@ -4,7 +4,7 @@ UFSHC nodes are defined to describe on-chip UFS host
>> controllers.
>>  Each UFS controller instance should have its own node.
>>
>>  Required properties:
>> -- compatible        : compatible list, contains "jedec,ufs-1.1"
>> +- compatible        : compatible list, contains "jedec,ufs-1.1" or
>> "qcom,ufshc"
>
> Replying again as I inadvertently dropped everyone.
>
> This should also have a more specific compatible string with the SOC
> name/number in it. It may be "the same in all SOCs", but there is
> always the possibility for bugs/limitations to be found that are
> specific to an SOC even if all RTL versions are identical (e.g.
> different max clock speeds). It is about making the dtb future proof,
> not about what exactly you need today. You can keep qcom,ufshc for
> driver matching if you want.

I see your point.
I just would like to make sure, syntactically speaking, if what you mean
should look like:

compatible        : compatible list, contains "jedec,ufs-1.1" or
                    "qcom,ufshc" for msm8994, msm8996 SOCs.



>
>>  - interrupts        : <interrupt mapping for UFS host controller IRQ>
>>  - reg               : <registers mapping>
>
> What about phy properties? No Unipro PHY block that requires setup?
>

yes, i will add another documentation file for it.


> Rob
> --
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