linux-kernel - Re: [RFC PATCH v2 03/14] of: mtd: add documentation for nand-ecc-level property

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Date:	Wed, 05 Feb 2014 14:34:44 +0100
From:	Boris BREZILLON <b.brezillon.dev@...il.com>
To:	Grant Likely <grant.likely@...aro.org>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
CC:	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Rob Landley <rob@...dley.net>,
	Russell King <linux@....linux.org.uk>,
	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Arnd Bergmann <arnd@...db.de>, devicetree@...r.kernel.org,
	linux-doc@...r.kernel.org, dev@...ux-sunxi.org,
	linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, Pekon Gupta <pekon@...com>
Subject: Re: [RFC PATCH v2 03/14] of: mtd: add documentation for nand-ecc-level
 property

On 05/02/2014 12:15, Grant Likely wrote:
> On Wed, 29 Jan 2014 14:53:32 -0300, Ezequiel Garcia <ezequiel.garcia@...e-electrons.com> wrote:
>> On Wed, Jan 29, 2014 at 03:34:13PM +0100, Boris BREZILLON wrote:
>>> nand-ecc-level property statically defines NAND chip's ECC requirements.
>>>
>>> Signed-off-by: Boris BREZILLON <b.brezillon.dev@...il.com>
>>> ---
>>>   Documentation/devicetree/bindings/mtd/nand.txt |    3 +++
>>>   1 file changed, 3 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/mtd/nand.txt b/Documentation/devicetree/bindings/mtd/nand.txt
>>> index 03855c8..0c962296 100644
>>> --- a/Documentation/devicetree/bindings/mtd/nand.txt
>>> +++ b/Documentation/devicetree/bindings/mtd/nand.txt
>>> @@ -3,5 +3,8 @@
>>>   - nand-ecc-mode : String, operation mode of the NAND ecc mode.
>>>     Supported values are: "none", "soft", "hw", "hw_syndrome", "hw_oob_first",
>>>     "soft_bch".
>>> +- nand-ecc-level : Two cells property defining the ECC level requirements.
>>> +  The first cell represent the strength and the second cell the ECC block size.
>>> +  E.g. : nand-ecc-level = <4 512>; /* 4 bits / 512 bytes */
>>>   - nand-bus-width : 8 or 16 bus width if not present 8
>>>   - nand-on-flash-bbt: boolean to enable on flash bbt option if not present false
>> Hm.. when was this proposal agreed? It seems I've missed the
>> discussion...
>>
>> FWIW, we've already proposed an equivalent one, but it received no
>> feedback from the devicetree maintainers:
> Sorry, binding review has become a huge undertaking.
>
>> http://comments.gmane.org/gmane.linux.drivers.devicetree/58764
>>
>> Maybe we can discuss about it now?
>>
>>    nand-ecc-strength : integer ECC required strength.
>>    nand-ecc-size : integer step size associated to the ECC strength.
> I'm okay with either, but the above binding is indeed more readable.

That's fine by me, if everybody agrees, let's go for the
nand-ecc-strength/nand-ecc-size couple then.

I'll rebase next version of my series on Ezequiel's patch providing
these OF helpers.

Best Regards,

Boris

>
> g.

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