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

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Date:   Mon, 04 Mar 2019 19:23:50 +0100
From:   Paul Cercueil <paul@...pouillou.net>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
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


On Mon, Mar 4, 2019 at 10:50 AM, Miquel Raynal 
<miquel.raynal@...tlin.com> wrote:
> Hi Paul,
> 
> Paul Cercueil <paul@...pouillou.net <mailto: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 
>> <mailto: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.

ingenic,bch-controller is already in the devicetree ABI. I can't change 
it now...

>>     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