linux-kernel - Re: [LINUX PATCH v12 1/3] dt-bindings: mtd: arasan: Add device tree binding documentation

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Message-ID: <20181109072857.75e86cb6@bbrezillon>
Date:   Fri, 9 Nov 2018 07:28:57 +0100
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Naga Sureshkumar Relli <naga.sureshkumar.relli@...inx.com>
Cc:     <miquel.raynal@...tlin.com>, <richard@....at>,
        <dwmw2@...radead.org>, <computersforpeace@...il.com>,
        <marek.vasut@...il.com>, <michals@...inx.com>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <nagasuresh12@...il.com>, <robh@...nel.org>
Subject: Re: [LINUX PATCH v12 1/3] dt-bindings: mtd: arasan: Add device tree
 binding documentation

On Fri, 9 Nov 2018 10:30:39 +0530
Naga Sureshkumar Relli <naga.sureshkumar.relli@...inx.com> wrote:

> This patch adds the dts binding document for arasan nand flash controller
> 
> Signed-off-by: Naga Sureshkumar Relli <naga.sureshkumar.relli@...inx.com>
> ---
> Changes in v12:
>  - Removed interrupt-parent description as it is implied as suggested by
>    Rob Herring
>  - Added missing ';' as required
> Changes in v11:
>  - Updated compatible description as suggested by Boris
>  - Removed arasan-has-dma property
> Changes in v10:
>  - None
> Changes in v9:
>  - None
> Changes in v8:
>  - Updated compatible and clock-names as per Boris comments
> Changes in v7:
>  - Corrected the acronyms those should be in caps
> Changes in v6:
>  - Removed num-cs property
>  - Separated nandchip from nand controller
> Changes in v5:
>  - None
> Changes in v4:
>  - Added num-cs property
>  - Added clock support
> Changes in v3:
>  - None
> Changes in v2:
>  - None
> ---
>  .../devicetree/bindings/mtd/arasan_nand.txt        | 32 ++++++++++++++++++++++
>  1 file changed, 32 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mtd/arasan_nand.txt
> 
> diff --git a/Documentation/devicetree/bindings/mtd/arasan_nand.txt b/Documentation/devicetree/bindings/mtd/arasan_nand.txt
> new file mode 100644
> index 0000000..b522daf
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/arasan_nand.txt
> @@ -0,0 +1,32 @@
> +Arasan NAND Flash Controller with ONFI 3.1 support
> +
> +Required properties:
> +- compatible:		Should be "xlnx,zynqmp-nand", "arasan,nfc-v3p10"
> +- reg:			Memory map for module access
> +- interrupts:		Should contain the interrupt for the device
> +- clock-name:		List of input clocks - "sys", "flash"
> +			(See clock bindings for details)
> +- clocks:		Clock phandles (see clock bindings for details)
> +
> +Required properties for child node:
> +- nand-ecc-mode: see nand.txt

Why is it required? Can't you fallback to HW when this prop is missing?
Oh, and reg is not listed in the required props.

> +
> +For NAND partition information please refer the below file
> +Documentation/devicetree/bindings/mtd/partition.txt
> +
> +Example:
> +	nfc: nand@...00000 {
> +		compatible = "xlnx,zynqmp-nand", "arasan,nfc-v3p10";
> +		reg = <0x0 0xff100000 0x1000>;
> +		clock-name = "sys", "flash";
> +		clocks = <&misc_clk &misc_clk>;
> +		interrupt-parent = <&gic>;
> +		interrupts = <0 14 4>;
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		nand@0 {
> +			reg = <0>;
> +			nand-ecc-mode = "hw";
> +		};
> +	};