Re: [PATCH v9 1/3] dt-bindings: binding for jz4780-{nand,bch}

[Boris Brezillon <boris.brezillon@free-electrons.com>]

On Thu, 3 Dec 2015 12:02:20 +0000
Harvey Hunt <harvey.hunt@imgtec.com> wrote:

> From: Alex Smith <alex.smith@imgtec.com>
> 
> 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@imgtec.com>
> Cc: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
> Cc: David Woodhouse <dwmw2@infradead.org>
> Cc: Brian Norris <computersforpeace@gmail.com>
> Cc: linux-mtd@lists.infradead.org
> Cc: devicetree@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: Harvey Hunt <harvey.hunt@imgtec.com>

FWIW:

Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>

> ---
> v8 -> v9:
>  - Document that partitions are represented as a child node of a NAND chip.
> 
> v7 -> v8:
>  - Describe how NAND chips are now child nodes of the NAND controller.
> 
> v6 -> v7:
>  - Add nand-ecc-mode to DT bindings.
>  - Add nand-on-flash-bbt to DT bindings.
> 
> v5 -> v6:
>  - No change.
> 
> v4 -> v5:
>  - Rename ingenic,bch-device to ingenic,bch-controller to fit with
>    existing convention.
> 
> 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           | 86 ++++++++++++++++++++++
>  1 file changed, 86 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 0000000..29ea585
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/ingenic,jz4780-nand.txt
> @@ -0,0 +1,86 @@
> +* 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 controller 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 controller device properties:
> +- ingenic,bch-controller: 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.
> +
> +Optional children nodes:
> +- Individual NAND chips are children of the NAND controller node.
> +
> +Required children node properties:
> +- reg: An integer ranging from 1 to 6 representing the CS line to use.
> +
> +Optional children node properties:
> +- nand-ecc-step-size: ECC block size in bytes.
> +- nand-ecc-strength: ECC strength (max number of correctable bits).
> +- nand-ecc-mode: String, operation mode of the NAND ecc mode. "hw" by default
> +- nand-on-flash-bbt: boolean to enable on flash bbt option, if not present false
> +- rb-gpios: GPIO specifier for the busy pin.
> +- wp-gpios: GPIO specifier for the write protect pin.
> +
> +Optional child node of NAND chip nodes:
> +- partitions: see Documentation/devicetree/bindings/mtd/partition.txt
> +
> +Example:
> +
> +nemc: nemc@13410000 {
> +	...
> +
> +	nandc: nand-controller@1 {
> +		compatible = "ingenic,jz4780-nand";
> +		reg = <1 0 0x1000000>;	/* Bank 1 */
> +
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		ingenic,bch-controller = <&bch>;
> +
> +		nand@1 {
> +			reg = <1>;
> +
> +			nand-ecc-step-size = <1024>;
> +			nand-ecc-strength = <24>;
> +			nand-ecc-mode = "hw";
> +			nand-on-flash-bbt;
> +
> +			rb-gpios = <&gpa 20 GPIO_ACTIVE_LOW>;
> +			wp-gpios = <&gpf 22 GPIO_ACTIVE_LOW>;
> +
> +			partitions {
> +				#address-cells = <2>;
> +				#size-cells = <2>;
> +				...
> +			}
> +		};
> +	};
> +};
> +
> +The BCH controller is a separate SoC component used for error correction on
> +NAND devices. The following is a description of the device properties for a
> +BCH controller.
> +
> +Required BCH properties:
> +- compatible: Should be set to "ingenic,jz4780-bch".
> +- reg: Should specify the BCH controller registers location and length.
> +- clocks: Clock for the BCH controller.
> +
> +Example:
> +
> +bch: bch@134d0000 {
> +	compatible = "ingenic,jz4780-bch";
> +	reg = <0x134d0000 0x10000>;
> +
> +	clocks = <&cgu JZ4780_CLK_BCH>;
> +};



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com