linux-kernel - Re: [PATCH v2 03/12] devicetree: Add bindings for the ATH79 DDR controllers

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Date:	Sun, 19 Apr 2015 16:52:00 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Alban Bedel <albeu@...e.fr>, linux-mips@...ux-mips.org
CC:	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>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Andrew Bresticker <abrestic@...omium.org>,
	Qais Yousef <qais.yousef@...tec.com>,
	Gabor Juhos <juhosg@...nwrt.org>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 03/12] devicetree: Add bindings for the ATH79 DDR controllers

Hello.

On 4/19/2015 3:57 PM, Alban Bedel wrote:

> The DDR controller of the ARxxx and AR9xxx famillies provides an
> interface to flush the FIFO between various devices and the DDR.
> This is mainly used by the IRQ controller to flush the FIFO before
> running the interrupt handler of such devices.

> Signed-off-by: Alban Bedel <albeu@...e.fr>
> ---
> v2: * Fix the node names to respect ePAPR

    I don't see where you did this.

> ---
>   .../memory-controllers/ath79-ddr-controller.txt    | 35 ++++++++++++++++++++++
>   1 file changed, 35 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/memory-controllers/ath79-ddr-controller.txt
>
> diff --git a/Documentation/devicetree/bindings/memory-controllers/ath79-ddr-controller.txt b/Documentation/devicetree/bindings/memory-controllers/ath79-ddr-controller.txt
> new file mode 100644
> index 0000000..5541eed
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/memory-controllers/ath79-ddr-controller.txt
> @@ -0,0 +1,35 @@
> +Binding for Qualcomm  Atheros AR7xxx/AR9xxx DDR controller
> +
> +The DDR controller of the ARxxx and AR9xxx famillies provides an interface

    Families.

> +to flush the FIFO between various devices and the DDR. This is mainly used
> +by the IRQ controller to flush the FIFO before running the interrupt handler
> +of such devices.
> +
> +Required properties:
> +
> +- compatible: has to be "qca,<soc-type>-ddr-controller",
> +  "qca,[ar7100|ar7240]-ddr-controller" as fallback.
> +  On SoC with PCI support "qca,ar7100-ddr-controller" should be used as
> +  fallback, otherwise "qca,ar7240-ddr-controller" should be used.
> +- reg: Base address and size of the controllers memory area
> +- #qca,ddr-wb-channel-cells: has to be 1, the index of the write buffer
> +  channel
> +
> +Example:
> +
> +	ddr_ctrl: ddr-controller@...00000 {

    Should still be "memory-controller@...00000".

> +		compatible = "qca,ar9132-ddr-controller",
> +				"qca,ar7240-ddr-controller";
> +		reg = <0x18000000 0x100>;
> +
> +		#qca,ddr-wb-channel-cells = <1>;
> +	};
> +
> +	...
> +
> +	cpuintc@0 {

    "interrupt-controller" here?

> +		...
> +		qca,ddr-wb-channel-interrupts = <2>, <3>, <4>, <5>;
> +		qca,ddr-wb-channels = <&ddr_ctrl 3>, <&ddr_ctrl 2>,
> +					<&ddr_ctrl 0>, <&ddr_ctrl 1>;
> +	};

WBR, Sergei

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