linux-kernel - Re: [PATCHv5 5/5] arm: dts: Add Altera L2 Cache and OCRAM EDAC

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Date:	Tue, 2 Dec 2014 14:57:35 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	"tthayer@...nsource.altera.com" <tthayer@...nsource.altera.com>
Cc:	"bp@...en8.de" <bp@...en8.de>,
	"dougthompson@...ssion.com" <dougthompson@...ssion.com>,
	"m.chehab@...sung.com" <m.chehab@...sung.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>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"dinguyen@...nsource.altera.com" <dinguyen@...nsource.altera.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"tthayer.linux@...il.com" <tthayer.linux@...il.com>
Subject: Re: [PATCHv5 5/5] arm: dts: Add Altera L2 Cache and OCRAM EDAC

On Wed, Nov 12, 2014 at 12:14:23AM +0000, tthayer@...nsource.altera.com wrote:
> From: Thor Thayer <tthayer@...nsource.altera.com>
> 
> Adding the device tree entries and bindings needed to support
> the Altera L2 cache and On-Chip RAM EDAC. This patch relies upon
> an earlier patch to declare and setup On-chip RAM properly.
> http://www.spinics.net/lists/devicetree/msg51117.html
> 
> Signed-off-by: Thor Thayer <tthayer@...nsource.altera.com>
> ---
> v2: Remove OCRAM declaration and reference prior patch.
> 
> v3-5: No Change
> ---
>  .../bindings/arm/altera/socfpga-l2-edac.txt        |   15 +++++++++++++++
>  .../bindings/arm/altera/socfpga-ocram-edac.txt     |   16 ++++++++++++++++
>  arch/arm/boot/dts/socfpga.dtsi                     |   15 ++++++++++++++-
>  3 files changed, 45 insertions(+), 1 deletion(-)
>  create mode 100644 Documentation/devicetree/bindings/arm/altera/socfpga-l2-edac.txt
>  create mode 100644 Documentation/devicetree/bindings/arm/altera/socfpga-ocram-edac.txt
> 
> diff --git a/Documentation/devicetree/bindings/arm/altera/socfpga-l2-edac.txt b/Documentation/devicetree/bindings/arm/altera/socfpga-l2-edac.txt
> new file mode 100644
> index 0000000..35b19e3
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/altera/socfpga-l2-edac.txt
> @@ -0,0 +1,15 @@
> +Altera SoCFPGA L2 cache Error Detection and Correction [EDAC]
> +
> +Required Properties:
> +- compatible : Should be "altr,l2-edac"
> +- reg : Address and size for ECC error interrupt clear registers.
> +- interrupts : Should be single bit error interrupt, then double bit error
> +	interrupt. Note the rising edge type.
> +
> +Example:
> +
> +	l2edac@...08140 {
> +		compatible = "altr,l2-edac";
> +		reg = <0xffd08140 0x4>;
> +		interrupts = <0 36 1>, <0 37 1>;
> +	};

Judging by the size of the reg entry, this is part of a larger block
(the same one the OCRAM EDAC lives in). Why isn't that larger block
described?

EDAC is a Linux subsystem name, but typically not the HW block name.
What HW block does this live in?

> diff --git a/Documentation/devicetree/bindings/arm/altera/socfpga-ocram-edac.txt b/Documentation/devicetree/bindings/arm/altera/socfpga-ocram-edac.txt
> new file mode 100644
> index 0000000..31ab205
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/altera/socfpga-ocram-edac.txt
> @@ -0,0 +1,16 @@
> +Altera SoCFPGA On-Chip RAM Error Detection and Correction [EDAC]
> +
> +OCRAM ECC Required Properties:
> +- compatible : Should be "altr,ocram-edac"
> +- reg : Address and size for ECC error interrupt clear registers.
> +- iram : phandle to On-Chip RAM definition.
> +- interrupts : Should be single bit error interrupt, then double bit error
> +	interrupt. Note the rising edge type.
> +
> +Example:
> +	ocramedac@...08144 {
> +		compatible = "altr,ocram-edac";
> +		reg = <0xffd08144 0x4>;
> +		iram = <&ocram>;
> +		interrupts = <0 178 1>, <0 179 1>;
> +	};
> diff --git a/arch/arm/boot/dts/socfpga.dtsi b/arch/arm/boot/dts/socfpga.dtsi
> index 6af96ed..32c63a3 100644
> --- a/arch/arm/boot/dts/socfpga.dtsi
> +++ b/arch/arm/boot/dts/socfpga.dtsi
> @@ -618,8 +618,21 @@
>  			interrupts = <0 39 4>;
>  		};
>  
> +		l2edac@...08140 {
> +			compatible = "altr,l2-edac";
> +			reg = <0xffd08140 0x4>;
> +			interrupts = <0 36 1>, <0 37 1>;
> +		};
> +
> +		ocramedac@...08144 {
> +			compatible = "altr,ocram-edac";
> +			reg = <0xffd08144 0x4>;
> +			iram = <&ocram>;
> +			interrupts = <0 178 1>, <0 179 1>;
> +		};
> +
>  		L2: l2-cache@...ef000 {
> -			compatible = "arm,pl310-cache";
> +			compatible = "arm,pl310-cache", "syscon";

NAK. 

Why are you marking the PL310 as a syscon device? It is most definitely
_NOT_ a shared set of registers lumped together.

Thanks,
Mark.
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