linux-kernel - Re: [PATCH v6 0/9] Add simple NVMEM Framework via regmap.

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Date:	Wed, 24 Jun 2015 11:24:29 +0530
From:	Sanchayan Maity <maitysanchayan@...il.com>
To:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:	Stefan Wahren <stefan.wahren@...e.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	arnd@...db.de, linux-api@...r.kernel.org, s.hauer@...gutronix.de,
	sboyd@...eaurora.org, linux-kernel@...r.kernel.org,
	pantelis.antoniou@...sulko.com, Rob Herring <robh+dt@...nel.org>,
	Mark Brown <broonie@...nel.org>,
	Kumar Gala <galak@...eaurora.org>, mporter@...sulko.com,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	linux-arm-msm@...r.kernel.org, wxt@...k-chips.com
Subject: Re: [PATCH v6 0/9] Add simple NVMEM Framework via regmap.

Hello,

On 15-06-23 21:47:34, Stefan Wahren wrote:
> Hi Srinivas,
> 
> > Srinivas Kandagatla <srinivas.kandagatla@...aro.org> hat am 23. Juni 2015 um
> > 01:07 geschrieben:
> >
> >
> > [...]
> >
> > Device Tree:
> >
> > /* Provider */
> > qfprom: qfprom@...00000 {
> > ...
> >
> > /* Data cells */
> > tsens_calibration: calib@404 {
> > reg = <0x404 0x10>;
> > };
> >
> > tsens_calibration_bckp: calib_bckp@504 {
> > reg = <0x504 0x11>;
> > bit-offset = 6;
> > nbits = 128;
> > };
> >
> > pvs_version: pvs-version@6 {
> > reg = <0x6 0x2>
> > bit-offset = 7;
> > nbits = 2;
> > };
> >
> > speed_bin: speed-bin@c{
> > reg = <0xc 0x1>;
> > bit-offset = 2;
> > nbits = 3;
> >
> > };
> > ...
> > };
> >
> > userspace interface: binary file in /sys/class/nvmem/*/nvmem
> >
> > ex:
> > hexdump /sys/class/nvmem/qfprom0/nvmem
> >
> > 0000000 0000 0000 0000 0000 0000 0000 0000 0000
> > *
> > 00000a0 db10 2240 0000 e000 0c00 0c00 0000 0c00
> > 0000000 0000 0000 0000 0000 0000 0000 0000 0000
> > ...
> > *
> > 0001000
> >
> 
> i want to port OCOTP driver for MXS, which hasn't MMIO. From my understanding
> hexdump would readout the complete register range defined in provider DT node.
> 
> How can i achieve that hexdump only reads the data area within the register
> range?

I also had a similar question in my mind.

- Sanchayan.
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