linux-kernel - Re: MTD EEPROM support and driver integration

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Date:	Mon, 8 Jul 2013 09:36:14 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Artem Bityutskiy <dedekind1@...il.com>,
	Shawn Guo <shawn.guo@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	oliver@...inagl.nl, linux-mtd@...ts.infradead.org,
	Wolfram Sang <wsa@...-dreams.de>,
	Jean Delvare <khali@...ux-fr.org>, linux-i2c@...r.kernel.org
Subject: Re: MTD EEPROM support and driver integration

On Sun, Jul 07, 2013 at 09:15:01AM +0200, Maxime Ripard wrote:
> On Sat, Jul 06, 2013 at 09:06:49PM +0200, Arnd Bergmann wrote:

> > We also have a bunch of OTP drivers spread around the kernel, it probably
> > makes sense to consolidate them at the same time, at least on the DT binding
> > side if not the device drivers.

> From a quick grep, the only one I've seen so far are:
>   - imx6q, that has a hook at machine start to poke into its OCOTP to
>     retrieve some frequency scaling parameters it seems. I'm not sure
>     how the current solution could improve the situation for this
>     use-case, but the DT bindings of the OCOTP is just a DT node, with
>     no clients, so we have nothing to worry about here.
>   - imx28, that has a hook at machine start to look up the MAC address
>     values and patch the ethernet controller nodes to add the right
>     local-mac-address property. This one could benefit from the new
>     bindings, but we already mentionned it, and I intended to develop
>     with an imx28 board anyway.
>   - picoxcell-pc3x3 DTSI has a node for a OTP device, but they don't
>     seem to be doing anything with it, nor do they seem to have a driver
>     for it. So I guess we don't care about migrating for this one
>     either.

> Did you have other cases in mind?

We have some OTP support in the ab8500 and wm831x MFD drivers too but
they just expose the data.

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