linux-kernel - Re: [PATCH v2] ARM: dts: exynos5422-odroidxu3: add on-board INA231 sensors

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Message-ID: <1421745586.6818.34.camel@collabora.co.uk>
Date:	Tue, 20 Jan 2015 10:19:46 +0100
From:	Sjoerd Simons <sjoerd.simons@...labora.co.uk>
To:	Kevin Hilman <khilman@...nel.org>
Cc:	Kukjin Kim <kgene.kim@...sung.com>,
	linux-samsung-soc@...r.kernel.org, linaro-kernel@...ts.linaro.org,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Kukjin Kim <kgene@...nel.org>,
	"open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>,
	"moderated list:ARM PORT" <linux-arm-kernel@...ts.infradead.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] ARM: dts: exynos5422-odroidxu3: add on-board INA231
 sensors

On Wed, 2015-01-14 at 17:08 -0800, Kevin Hilman wrote:
> From: Kevin Hilman <khilman@...aro.org>
> 
> The odroid-xu3 has 4 INA231 current sensors on board which can be
> accessed from the Linux via the hwmon interface.
> 
> There is one sensor for each of these power rails:
> 
> - A15 cluster: VDD_ARM
> - A7 cluster: VDD_KFC
> - GPU: VDD_G3D
> - memory: VDD_MEM
> 
> In addition to adding the sensors, LDO26 from the PMIC needs to be
> enabled because it's powering these sensor.

I haven't tested whether the sensor values are correct, but based on the
schematics & the hardkernel dts this describes the hardware correctly.

Reviewed-By: Sjoerd Simons <sjoerd.simons@...labora.co.uk>

> Cc: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
> Cc: Sjoerd Simons <sjoerd.simons@...labora.co.uk>
> Signed-off-by: Kevin Hilman <khilman@...aro.org>
> ---
> v2: use "ti,ina231" as compatible string.
> 
> Applies on top of "ARM: dts: Add dts file for odroid XU3 board" from Sjoerd Simons.
> 
>  arch/arm/boot/dts/exynos5422-odroidxu3.dts | 39 ++++++++++++++++++++++++++++++
>  1 file changed, 39 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/exynos5422-odroidxu3.dts b/arch/arm/boot/dts/exynos5422-odroidxu3.dts
> index c29123c0734d..50353d023225 100644
> --- a/arch/arm/boot/dts/exynos5422-odroidxu3.dts
> +++ b/arch/arm/boot/dts/exynos5422-odroidxu3.dts
> @@ -174,6 +174,13 @@
>  					regulator-always-on;
>  				};
>  
> +				ldo26_reg: LDO26 {
> +					regulator-name = "vdd_ldo26";
> +					regulator-min-microvolt = <3000000>;
> +					regulator-max-microvolt = <3000000>;
> +					regulator-always-on;
> +				};
> +
>  				buck1_reg: BUCK1 {
>  					regulator-name = "vdd_mif";
>  					regulator-min-microvolt = <800000>;
> @@ -257,6 +264,38 @@
>  		};
>  	};
>  
> +	i2c_0: i2c@...60000 {
> +		status = "okay";
> +
> +		/* A15 cluster: VDD_ARM */
> +		ina231@40 {
> +			compatible = "ti,ina231";
> +			reg = <0x40>;
> +			shunt-resistor = <10000>;
> +		};
> +
> +		/* memory: VDD_MEM */
> +		ina231@41 {
> +			compatible = "ti,ina231";
> +			reg = <0x41>;
> +			shunt-resistor = <10000>;
> +		};
> +
> +		/* GPU: VDD_G3D */
> +		ina231@44 {
> +			compatible = "ti,ina231";
> +			reg = <0x44>;
> +			shunt-resistor = <10000>;
> +		};
> +
> +		/* A7 cluster: VDD_KFC */
> +		ina231@45 {
> +			compatible = "ti,ina231";
> +			reg = <0x45>;
> +			shunt-resistor = <10000>;
> +		};
> +	};
> +
>  	i2c_2: i2c@...80000 {
>  		samsung,i2c-sda-delay = <100>;
>  		samsung,i2c-max-bus-freq = <66000>;



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