linux-kernel - Re: [PATCH v4 2/3] dt-bindings: binding for jz4780-{nand,bch}

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Message-ID: <CAAEAJfCqnfD-QOiDu-d8+zoco7zuayCwY2B_+d+2dpJg280F1Q@mail.gmail.com>
Date:	Mon, 7 Sep 2015 14:16:15 -0300
From:	Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
To:	Alex Smith <alex.smith@...tec.com>
Cc:	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Zubair Lutfullah Kakakhel <Zubair.Kakakhel@...tec.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Brian Norris <computersforpeace@...il.com>,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH v4 2/3] dt-bindings: binding for jz4780-{nand,bch}

On 27 July 2015 at 10:50, Alex Smith <alex.smith@...tec.com> wrote:
> Add DT bindings for NAND devices connected to the NEMC on JZ4780 SoCs,
> as well as the hardware BCH controller, used by the jz4780_{nand,bch}
> drivers.
>
> Signed-off-by: Alex Smith <alex.smith@...tec.com>
> Cc: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@...tec.com>
> Cc: David Woodhouse <dwmw2@...radead.org>
> Cc: Brian Norris <computersforpeace@...il.com>
> Cc: linux-mtd@...ts.infradead.org
> Cc: devicetree@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> ---
> v3 -> v4:
>  - No change
>
> v2 -> v3:
>  - Rebase to 4.0-rc6
>  - Changed ingenic,ecc-size to common nand-ecc-step-size
>  - Changed ingenic,ecc-strength to common nand-ecc-strength
>  - Changed ingenic,busy-gpio to common rb-gpios
>  - Changed ingenic,wp-gpio to common wp-gpios
>
> v1 -> v2:
>  - Rebase to 4.0-rc3
> ---
>  .../bindings/mtd/ingenic,jz4780-nand.txt           | 57 ++++++++++++++++++++++
>  1 file changed, 57 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mtd/ingenic,jz4780-nand.txt
>
> diff --git a/Documentation/devicetree/bindings/mtd/ingenic,jz4780-nand.txt b/Documentation/devicetree/bindings/mtd/ingenic,jz4780-nand.txt
> new file mode 100644
> index 000000000000..1e8e2eeffbf7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/ingenic,jz4780-nand.txt
> @@ -0,0 +1,57 @@
> +* Ingenic JZ4780 NAND/BCH
> +
> +This file documents the device tree bindings for NAND flash devices on the
> +JZ4780. NAND devices are connected to the NEMC controller (described in
> +memory-controllers/ingenic,jz4780-nemc.txt), and thus NAND device nodes must
> +be children of the NEMC node.
> +
> +Required NAND device properties:
> +- compatible: Should be set to "ingenic,jz4780-nand".
> +- reg: For each bank with a NAND chip attached, should specify a bank number,
> +  an offset of 0 and a size of 0x1000000 (i.e. the whole NEMC bank).
> +
> +Optional NAND device properties:
> +- ingenic,bch-device: To make use of the hardware BCH controller, this property
> +  must contain a phandle for the BCH controller node. The required properties
> +  for this node are described below. If this is not specified, software BCH
> +  will be used instead.
> +- nand-ecc-step-size: ECC block size in bytes.
> +- nand-ecc-strength: ECC strength (max number of correctable bits).
> +- rb-gpios: GPIO specifier for the busy pin.
> +- wp-gpios: GPIO specifier for the write protect pin.
> +
> +Example:
> +
> +nemc: nemc@...10000 {
> +       ...
> +
> +       nand: nand@1 {
> +               compatible = "ingenic,jz4780-nand";
> +               reg = <1 0 0x1000000>;  /* Bank 1 */
> +
> +               ingenic,bch-device = <&bch>;

I believe it's slighly more common to use a -controller suffix for
such a property:

$ git grep "controller = <&" Documentation/devicetree/bindings/

Other than this, it looks good.
-- 
Ezequiel García, VanguardiaSur
www.vanguardiasur.com.ar
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