linux-kernel - Re: [PATCH v4 2/9] dt-bindings: mtd: ingenic: Change 'BCH' to 'ECC' in documentation

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Date:   Mon, 4 Mar 2019 10:50:14 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Harvey Hunt <harveyhuntnexus@...il.com>,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/9] dt-bindings: mtd: ingenic: Change 'BCH' to 'ECC'
 in documentation

Hi Paul,

Paul Cercueil <paul@...pouillou.net> wrote on Sat,  9 Feb 2019 16:22:58
-0300:

> The JZ4740 ECC hardware is not BCH but Reed-Solomon, so it makes more
> sense to use the more generic ECC term.
> 
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> ---
> 
> Changes:
> 
> v3: New patch
> 
> v4: No change
> 
>  .../devicetree/bindings/mtd/ingenic,jz4780-nand.txt    | 18 +++++++++---------
>  1 file changed, 9 insertions(+), 9 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mtd/ingenic,jz4780-nand.txt b/Documentation/devicetree/bindings/mtd/ingenic,jz4780-nand.txt
> index a5b940f18bf6..5a45cc54f46d 100644
> --- a/Documentation/devicetree/bindings/mtd/ingenic,jz4780-nand.txt
> +++ b/Documentation/devicetree/bindings/mtd/ingenic,jz4780-nand.txt
> @@ -1,4 +1,4 @@
> -* Ingenic JZ4780 NAND/BCH
> +* Ingenic JZ4780 NAND/ECC
>  
>  This file documents the device tree bindings for NAND flash devices on the
>  JZ4780. NAND devices are connected to the NEMC controller (described in
> @@ -14,10 +14,10 @@ Required NAND controller device properties:
>    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
> +- ingenic,bch-controller: To make use of the hardware ECC controller, this
> +  property must contain a phandle for the ECC controller node. The required

I think there is already a 'ecc-engine' property used by MTK and Atmel
NAND controllers to point to the ECC engine block. Please use this
property instead of the ingenic specific one.

>    properties for this node are described below. If this is not specified,
> -  software BCH will be used instead.
> +  software ECC will be used instead.
>  
>  Optional children nodes:
>  - Individual NAND chips are children of the NAND controller node.
> @@ -70,17 +70,17 @@ nemc: nemc@...10000 {
>  	};
>  };
>  
> -The BCH controller is a separate SoC component used for error correction on
> +The ECC 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.
> +ECC controller.
>  
> -Required BCH properties:
> +Required ECC properties:
>  - compatible: Should be one of:
>    * ingenic,jz4740-ecc
>    * ingenic,jz4725b-bch
>    * ingenic,jz4780-bch
> -- reg: Should specify the BCH controller registers location and length.
> -- clocks: Clock for the BCH controller.
> +- reg: Should specify the ECC controller registers location and length.
> +- clocks: Clock for the ECC controller.
>  
>  Example:
>  

Thanks,
Miquèl