linux-kernel - Re: [PATCH 1/4] thermal: imx: Add nvmem-cells alternate binding for OCOTP access

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Date:   Mon, 10 Jul 2017 08:29:27 -0500
From:   Rob Herring <robh@...nel.org>
To:     Leonard Crestez <leonard.crestez@....com>
Cc:     Zhang Rui <rui.zhang@...el.com>,
        Eduardo Valentin <edubezval@...il.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Lothar Waßmann <LW@...O-electronics.de>,
        Fabio Estevam <fabio.estevam@....com>,
        Dong Aisheng <aisheng.dong@....com>,
        Bai Ping <ping.bai@....com>, Anson Huang <Anson.Huang@....com>,
        Octavian Purdila <octavian.purdila@....com>,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] thermal: imx: Add nvmem-cells alternate binding for
 OCOTP access

On Thu, Jul 06, 2017 at 04:20:41PM +0300, Leonard Crestez wrote:
> On newer imx SOCs accessing OCOTP directly is wrong because the ocotp
> clock needs to be enabled first. Add a binding for accessing the same
> values through the imx-ocotp nvmem driver using nvmem-cells. This is
> similar to other thermal drivers.
> 
> The old binding is preserved for compatibility and because it still
> works fine on imx6qdl series chips.
> 
> In theory this problem could be solved by adding a reference to the
> OCOTP clock instead but it is better to hide such details in a specific
> nvmem driver.
> 
> Signed-off-by: Leonard Crestez <leonard.crestez@....com>
> ---
>  Documentation/devicetree/bindings/thermal/imx-thermal.txt | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/thermal/imx-thermal.txt b/Documentation/devicetree/bindings/thermal/imx-thermal.txt
> index 3c67bd5..2842a05 100644
> --- a/Documentation/devicetree/bindings/thermal/imx-thermal.txt
> +++ b/Documentation/devicetree/bindings/thermal/imx-thermal.txt
> @@ -7,9 +7,16 @@ Required properties:
>    is higher than panic threshold, system will auto reboot by SRC module.
>  - fsl,tempmon : phandle pointer to system controller that contains TEMPMON
>    control registers, e.g. ANATOP on imx6q.
> +
> +Properties for OCOTP access:
>  - fsl,tempmon-data : phandle pointer to fuse controller that contains TEMPMON
>    calibration data, e.g. OCOTP on imx6q.  The details about calibration data
>    can be found in SoC Reference Manual.
> +Alternatively:

Just put these under required props and put the deprecated one under a 
deprecated section. IOW, make it easy to remove the deprecated part.

> +- nvmem-cells: A phandle to the calibration cells provided by ocotp.
> +- nvmem-cell-names: Should be "calib", "temp_grade".
> +
> +Direct access to OCOTP is deprecated, please use nvmem cells instead.
>  
>  Optional properties:
>  - clocks : thermal sensor's clock source.
> -- 
> 2.7.4
> 
> --
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