linux-kernel - Re: [PATCH 1/2] dts: socfpga: Add bindings for Altera SoC SDRAM controller

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Message-ID: <20140401052807.GN5052@pengutronix.de>
Date:	Tue, 1 Apr 2014 07:28:07 +0200
From:	Steffen Trumtrar <s.trumtrar@...gutronix.de>
To:	tthayer@...era.com
Cc:	dinguyen@...era.com, rob.herring@...xeda.com, pawel.moll@....com,
	mark.rutland@....com, devicetree@...lion.org.uk,
	galak@...eaurora.org, rob@...dley.net, linux@....linux.org.uk,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH 1/2] dts: socfpga: Add bindings for Altera SoC SDRAM
 controller

Hi!

On Mon, Mar 31, 2014 at 05:07:06PM -0500, tthayer@...era.com wrote:
> From: Thor Thayer <tthayer@...era.com>
> 
> Addition of the Altera SDRAM controller bindings and device
> tree changes to the Altera SoC project.
> 
> Signed-off-by: Thor Thayer <tthayer@...era.com>
> To: Rob Herring <rob.herring@...xeda.com>
> To: Pawel Moll <pawel.moll@....com>
> To: Mark Rutland <mark.rutland@....com>
> To: Ian Campbell <ijc+devicetree@...lion.org.uk>
> To: Kumar Gala <galak@...eaurora.org>
> To: Rob Landley <rob@...dley.net>
> To: Russell King <linux@....linux.org.uk>
> To: Dinh Nguyen <dinguyen@...era.com>
> Cc: devicetree@...r.kernel.org
> Cc: linux-doc@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-arm-kernel@...ts.infradead.org
> ---
>  .../bindings/arm/altera/socfpga-sdram.txt          |   14 ++++++++++++++
>  arch/arm/boot/dts/socfpga.dtsi                     |    5 +++++
>  2 files changed, 19 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/arm/altera/socfpga-sdram.txt
> 
> diff --git a/Documentation/devicetree/bindings/arm/altera/socfpga-sdram.txt b/Documentation/devicetree/bindings/arm/altera/socfpga-sdram.txt
> new file mode 100644
> index 0000000..351ab7b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/altera/socfpga-sdram.txt
> @@ -0,0 +1,14 @@
> +Altera SOCFPGA SDRAM Controller
> +
> +Required properties:
> +- compatible : "altr,sdr-ctl", "syscon";
> +                Note that syscon is invoked for this device to support the FPGA
> +		bridge driver and possibly other devices in the future.  See
> +		also Documentation/devicetree/bindings/mfd/syscon.txt

This note is really linux specific (and specific to some vendor kernel driver
for that matter). I think you should remove that.

> +- reg : Should contain 1 register ranges(address and length)
> +
> +Example:
> +	sdrctl@...fc25000 {
> +		compatible = "altr,sdr-ctl", "syscon";
> +		reg = <0xffc25000 0x1000>;
> +	};
> diff --git a/arch/arm/boot/dts/socfpga.dtsi b/arch/arm/boot/dts/socfpga.dtsi
> index 9e78c1d..3634de7 100644
> --- a/arch/arm/boot/dts/socfpga.dtsi
> +++ b/arch/arm/boot/dts/socfpga.dtsi
> @@ -528,6 +528,11 @@
>  			reg-io-width = <4>;
>  		};
>  
> +		sdrctl@...fc25000 {
> +			compatible = "altr,sdr-ctl", "syscon";
> +			reg = <0xffc25000 0x1000>;
> +		};
> +
>  		rstmgr@...05000 {
>  			compatible = "altr,rst-mgr";
>  			reg = <0xffd05000 0x1000>;

Regards,
Steffen

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