linux-kernel - Re: [PATCH v4 05/10] eeprom: Add bindings for simple eeprom framework

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Date:	Tue, 07 Apr 2015 19:03:30 +0100
From:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:	Mark Brown <broonie@...nel.org>
CC:	Matt Porter <mporter@...sulko.com>,
	Rob Herring <robherring2@...il.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Stephen Boyd <sboyd@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Kumar Gala <galak@...eaurora.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	"linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
	linux-arm-msm <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH v4 05/10] eeprom: Add bindings for simple eeprom framework



On 07/04/15 18:46, Mark Brown wrote:
> On Tue, Apr 07, 2015 at 06:35:49PM +0100, Srinivas Kandagatla wrote:
>> On 06/04/15 16:04, Matt Porter wrote:
>>> On Mon, Apr 06, 2015 at 09:11:05AM -0500, Rob Herring wrote:
>
>>>>> The generic binding could really use a "read-only" property here as this
>>>>> is a common hardware attribute for many nvmem devices. A serial EEPROM
>
>> Correct me If am wrong.
>
>> Regarding write protection/read-only, regmap already has provisions to
>> support this feature. regmap would bail out with errors if any attempt to
>> write to non-writable regions. It all depends on the data providers how they
>> setup the regmap and the bindings for those are specific individual data
>> providers I think.
>
> There is the ability to flag read/write permissions in regmap but I
> think there's some suggestion that this should be exposed to userspace
> so that it's easier for it to handle things rather than just writing
> then coping with any errors.

Yes, That's possible if the data provider use the "read-only" generic 
binding like MTD partitions which the eeprom framwork could use to set 
the binary file mode appropriately.

"read-only" property seems to be more generic for all types of data 
providers.

I will give it a try and document this in the bindings too in next version.

--srini
>
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