linux-kernel - Re: [PATCH v3 27/30] ARM: dts: sun8i: h3: use calibration for ths

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Date:   Tue, 4 Sep 2018 18:46:23 +0200
From:   Emmanuel Vadot <manu@...ouilliste.com>
To:     Philipp Rossak <embed3d@...il.com>
Cc:     lee.jones@...aro.org, robh+dt@...nel.org, mark.rutland@....com,
        maxime.ripard@...tlin.com, wens@...e.org, linux@...linux.org.uk,
        jic23@...nel.org, knaack.h@....de, lars@...afoo.de,
        pmeerw@...erw.net, eugen.hristev@...rochip.com,
        rdunlap@...radead.org, vilhelm.gray@...il.com,
        clabbe.montjoie@...il.com, quentin.schulz@...tlin.com,
        geert+renesas@...der.be, lukas@...ner.de, icenowy@...c.io,
        arnd@...db.de, broonie@...nel.org, arnaud.pouliquen@...com,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-sunxi@...glegroups.com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 27/30] ARM: dts: sun8i: h3: use calibration for ths

 Hi Philipp,

On Thu, 30 Aug 2018 17:45:15 +0200
Philipp Rossak <embed3d@...il.com> wrote:

> The H3 SID is supported by the kernel so we can add a NVMEM Data cell,
> that contains the calibration data.
> 
> On the H3 the eFuses are located at the offset 0x200. The thermal data
> itself has an offset of 0x34 from the eFuse base. So we end on an offset
> of 0x234.
> 
> Signed-off-by: Philipp Rossak <embed3d@...il.com>
> ---
>  arch/arm/boot/dts/sun8i-h3.dtsi | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/sun8i-h3.dtsi b/arch/arm/boot/dts/sun8i-h3.dtsi
> index 1866aec69ec1..0fc447f0c02a 100644
> --- a/arch/arm/boot/dts/sun8i-h3.dtsi
> +++ b/arch/arm/boot/dts/sun8i-h3.dtsi
> @@ -106,8 +106,15 @@
>  
>  	soc {
>  		sid: eeprom@...4000 {
> +			#address-cells = <1>;
> +			#size-cells = <1>;
>  			compatible = "allwinner,sun8i-h3-sid";
>  			reg = <0x01c14000 0x400>;
> +
> +			/* Data cells */
> +			thermal_calibration: calib@234 {
> +				reg = <0x234 0x8>;
> +			};

 You are declaring 8 bytes of calibration data but to my knowledge it's
only 2 bytes per sensor, so 2 bytes for H3.
 Am I missing something ?

 Thanks,
>  		};
>  	};
>  
> @@ -227,4 +234,6 @@
>  &ths {
>  	compatible = "allwinner,sun8i-h3-ths";
>  	#thermal-sensor-cells = <0>;
> +	nvmem-cells = <&thermal_calibration>;
> +	nvmem-cell-names = "calibration";
>  };
> -- 
> 2.11.0
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

-- 
Emmanuel Vadot <manu@...ouilliste.com> <manu@...ebsd.org>

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