linux-kernel - Re: [PATCH 1/3] ARM: dts: OMAP5+: separate the cpu thermal zone definition from omap4

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Message-ID: <20150320215402.GB7346@developer.amazonguestwifi.org>
Date:	Fri, 20 Mar 2015 17:54:03 -0400
From:	Eduardo Valentin <edubezval@...il.com>
To:	Nishanth Menon <nm@...com>
Cc:	Tony Lindgren <tony@...mide.com>,
	Benoît Cousson <bcousson@...libre.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-omap@...r.kernel.org,
	Keerthy <j-keerthy@...com>, Tero Kristo <t-kristo@...com>
Subject: Re: [PATCH 1/3] ARM: dts: OMAP5+: separate the cpu thermal zone
 definition from omap4

On Fri, Mar 20, 2015 at 02:47:39PM -0500, Nishanth Menon wrote:
> From: Tero Kristo <t-kristo@...com>
> 
> OMAP4 has a finer counter granularity, which allows for a delay of 1000ms
> in the thermal zone polling intervals. OMAP5/DRA7 have different counter
> mechanism, which allows at maximum a 500ms timer. Adjust the cpu thermal
> zone accordingly for OMAP5/DRA7.
> 
> Signed-off-by: Tero Kristo <t-kristo@...com>
> Signed-off-by: Nishanth Menon <nm@...com>


> ---
>  arch/arm/boot/dts/omap5-cpu-thermal.dtsi |   41 ++++++++++++++++++++++++++++++
>  arch/arm/boot/dts/omap5.dtsi             |    2 +-
>  2 files changed, 42 insertions(+), 1 deletion(-)
>  create mode 100644 arch/arm/boot/dts/omap5-cpu-thermal.dtsi
> 
> diff --git a/arch/arm/boot/dts/omap5-cpu-thermal.dtsi b/arch/arm/boot/dts/omap5-cpu-thermal.dtsi
> new file mode 100644
> index 000000000000..4a6427c1e47e
> --- /dev/null
> +++ b/arch/arm/boot/dts/omap5-cpu-thermal.dtsi
> @@ -0,0 +1,41 @@
> +/*
> + * Device Tree Source for OMAP4/5 SoC CPU thermal
> + *
> + * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
> + * Contact: Tero Kristo <t-kristo@...com>
> + *
> + * This file is licensed under the terms of the GNU General Public License
> + * version 2.  This program is licensed "as is" without any warranty of any
> + * kind, whether express or implied.
> + */
> +
> +#include <dt-bindings/thermal/thermal.h>
> +
> +cpu_thermal: cpu_thermal {
> +	polling-delay-passive = <250>; /* milliseconds */
> +	polling-delay = <500>; /* milliseconds */
> +
> +			/* sensor       ID */
> +	thermal-sensors = <&bandgap     0>;
> +
> +	cpu_trips: trips {
> +		cpu_alert0: cpu_alert {
> +			temperature = <100000>; /* millicelsius */
> +			hysteresis = <2000>; /* millicelsius */
> +			type = "passive";
> +		};
> +		cpu_crit: cpu_crit {
> +			temperature = <125000>; /* millicelsius */
> +			hysteresis = <2000>; /* millicelsius */
> +			type = "critical";
> +		};
> +	};
> +
> +	cpu_cooling_maps: cooling-maps {
> +		map0 {
> +			trip = <&cpu_alert0>;
> +			cooling-device =
> +				<&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
> +		};
> +	};
> +};
> diff --git a/arch/arm/boot/dts/omap5.dtsi b/arch/arm/boot/dts/omap5.dtsi
> index ddff674bd05e..e650d4eb59dd 100644
> --- a/arch/arm/boot/dts/omap5.dtsi
> +++ b/arch/arm/boot/dts/omap5.dtsi
> @@ -67,7 +67,7 @@
>  	};
>  
>  	thermal-zones {
> -		#include "omap4-cpu-thermal.dtsi"
> +		#include "omap5-cpu-thermal.dtsi"

Can't we simple change the polling value for the omap5 case and reuse
the omap4 file?

>  		#include "omap5-gpu-thermal.dtsi"
>  		#include "omap5-core-thermal.dtsi"
>  	};
> -- 
> 1.7.9.5
> 

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