linux-kernel - Re: [PATCH v3 8/9] eeprom: qfprom: Add bindings for qfprom

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Date:	Wed, 25 Mar 2015 01:28:33 +0100
From:	Bjorn Andersson <bjorn@...o.se>
To:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Rob Herring <robh+dt@...nel.org>,
	Kumar Gala <galak@...eaurora.org>,
	Mark Brown <broonie@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-api@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	linux-arm-msm <linux-arm-msm@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Stephen Boyd <sboyd@...eaurora.org>
Subject: Re: [PATCH v3 8/9] eeprom: qfprom: Add bindings for qfprom

On Tue, Mar 24, 2015 at 11:31 PM, Srinivas Kandagatla
<srinivas.kandagatla@...aro.org> wrote:
> This patch adds bindings for qfprom found in QCOM SOCs. QFPROM driver
> is based on simple eeprom framework.
>
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
>  .../devicetree/bindings/eeprom/qfprom.txt          | 23 ++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/eeprom/qfprom.txt
>
> diff --git a/Documentation/devicetree/bindings/eeprom/qfprom.txt b/Documentation/devicetree/bindings/eeprom/qfprom.txt
> new file mode 100644
> index 0000000..d5baed6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/eeprom/qfprom.txt
> @@ -0,0 +1,23 @@
> += Qualcomm QFPROM device tree bindings =
> +
> +This binding is intended to represent QFPROM which is found in most QCOM SOCs.
> +
> +Required properties:
> +- compatible: should be "qcom,qfprom"
> +- reg: Should contain registers location and length
> +
> += Data cells =
> +Are child nodes of qfprom, bindings of which as described in
> +bindings/eeprom/eeprom.txt
> +
> +Example:
> +
> +       qfprom: qfprom@...00000 {
> +               compatible      = "qcom,qfprom";
> +               reg             = <0x00700000 0x1000>;

The qfprom block starts at 0x700000 and is 0x8000 long.

The registers at the beginning of this block are raw R/W fuse bits and
should not be read directly. Instead there is an ecc corrected shadow
copy of these registers at 0x4000.

> +               ...
> +               /* Data cells */
> +               tsens_calibration: calib@404 {
> +                       reg = <0x404 0x10>;
> +               };
> +       };

Regards,
Bjorn
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