linux-kernel - Re: [RFC PATCH] edac: zynq: Added EDAC support for zynq ddr ecc controller

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Date:	Wed, 12 Mar 2014 11:27:13 +0100
From:	Michal Simek <michal.simek@...inx.com>
To:	Sören Brinkmann <soren.brinkmann@...inx.com>
CC:	Michal Simek <monstr@...str.eu>,
	Mark Rutland <mark.rutland@....com>,
	Punnaiah Choudary Kalluri 
	<punnaiah.choudary.kalluri@...inx.com>,
	"dougthompson@...ssion.com" <dougthompson@...ssion.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
	"michal.simek@...inx.com" <michal.simek@...inx.com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"rob@...dley.net" <rob@...dley.net>,
	"kpc528@...il.com" <kpc528@...il.com>,
	"kalluripunnaiahchoudary@...il.com" 
	<kalluripunnaiahchoudary@...il.com>,
	"punnaia@...inx.com" <punnaia@...inx.com>
Subject: Re: [RFC PATCH] edac: zynq: Added EDAC support for zynq ddr ecc controller

On 03/11/2014 04:50 PM, Sören Brinkmann wrote:
> On Tue, 2014-03-11 at 09:32AM +0100, Michal Simek wrote:
>> On 03/10/2014 11:32 PM, Sören Brinkmann wrote:
>>> On Mon, 2014-03-10 at 12:58PM +0100, Michal Simek wrote:
>>>> On 03/10/2014 11:56 AM, Mark Rutland wrote:
>>>>> On Sun, Mar 09, 2014 at 02:57:16AM +0000, Punnaiah Choudary Kalluri wrote:
>>>>>> Added EDAC support for reporting the ecc errors of zynq ddr controller.
>>>>>> The ddr ecc controller corrects single bit errors and detects double bit
>>>>>> errors
>>>>>>
>>>>>> Signed-off-by: Punnaiah Choudary Kalluri <punnaia@...inx.com>
>>>>>> ---
>>>>>>  .../devicetree/bindings/edac/zynq_edac.txt         |   18 +
>>>>>>  drivers/edac/Kconfig                               |    7 +
>>>>>>  drivers/edac/Makefile                              |    1 +
>>>>>>  drivers/edac/zynq_edac.c                           |  613 ++++++++++++++++++++
>>>>>>  4 files changed, 639 insertions(+), 0 deletions(-)
>>>>>>  create mode 100644 Documentation/devicetree/bindings/edac/zynq_edac.txt
>>>>>>  create mode 100644 drivers/edac/zynq_edac.c
>>>>>>
>>>>>> diff --git a/Documentation/devicetree/bindings/edac/zynq_edac.txt b/Documentation/devicetree/bindings/edac/zynq_edac.txt
>>>>>> new file mode 100644
>>>>>> index 0000000..c21ff83
>>>>>> --- /dev/null
>>>>>> +++ b/Documentation/devicetree/bindings/edac/zynq_edac.txt
>>>>>> @@ -0,0 +1,18 @@
>>>>>> +Zynq EDAC driver, it does reports the DDR ECC single bit errors that are
>>>>>> +corrected and double bit ecc errors that are detected by the DDR ECC controller.
>>>>>> +ECC support for DDR is available in half-bus width(16 bit) configuration only.
>>>>>> +
>>>>>> +Required properties:
>>>>>> +- compatible: Should be "xlnx,ps7-ddrc" or "xlnx,ps7-ddrc-1.00.a"
>>>>>
>>>>> Is this an or or a xor?
>>>>
>>>> Compatible string should be just xlnx,zynq-ddrc-1.00.a.
>>>> Nothing with ps7.
>>>
>>> Isn't this vendor IP? IMHO, this should be something completely
>>> different. Or if you want some Zynq-specific compat string it should
>>> refer to an actual version string associated with Zynq. 1.00.a is not,
>>> AFAIK.
>>
>> I have checked with Punnaiah that this is Synopsys DDR memory controller.
>> Zynq is based on 1.4 version with some customization.
>> It means I think reasonable solution is
>> call it drivers/edac/synopsys_edac.c
>> rename zynq_ in driver to synopsys_ and
>> use xlnx,zynq-ddrc-1.00.a compatible string because zynq is not using
>> clean synopsys version.
>>
>> I am not getting point why you don't like 1.00.a suffix here.
>> Because of historical point of view compatible strings should be different
>> for early silicon, silicon v1, silicon v2, silicon v3, etc
>> but we haven't used it at all that's why we can use xilinx scheme
>> which we are using for our soft IPs.
> 
> Well, but you refer to Zynq which has silicon revisions you can use to
> refer to a specific Zynq version. That matches data sheets. Zynq-1.00.a
> is just completely made up and wouldn't be found in any data sheet.

I didn't reply this one but we discussed this with Soren over phone.
No problem to use Synopsys version A07 according TRM.

Then compatible string is
xlnx,zynq-ddrc-A07 and file name is synopsys_edac.c

Soren: please correct me if I DDRC version is wrong.

Regarding silicon revision in compatible string let's start new thread
out of this ddrc one.

Thanks,
Michal


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