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

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Message-ID: <20140310105655.GH14999@e106331-lin.cambridge.arm.com>
Date:	Mon, 10 Mar 2014 10:56:56 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Punnaiah Choudary Kalluri <punnaiah.choudary.kalluri@...inx.com>
Cc:	"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 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?

For the former case, which is the most general, which can be used as a
fallback?

How about something like:

- compatible: should contain:
  * "xlnx,ps7-ddrc-1.00.a" for <DESCRIPTION HERE>
  * "xlnx,ps7-ddrc" for any compatible variant

Is there any need at all for the "xlnx,ps7-ddrc" string? The driver
doesn't care about it.

Cheers,
Mark.
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