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Message-ID: <51C269A7.1070709@ti.com>
Date: Wed, 19 Jun 2013 22:32:07 -0400
From: Eduardo Valentin <eduardo.valentin@...com>
To: Amit Daniel Kachhap <amit.daniel@...sung.com>
CC: <linux-pm@...r.kernel.org>, Zhang Rui <rui.zhang@...el.com>,
Eduardo Valentin <eduardo.valentin@...com>,
<linux-samsung-soc@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <amit.kachhap@...il.com>,
Kukjin Kim <kgene.kim@...sung.com>, <jonghwa3.lee@...sung.com>
Subject: Re: [PATCH V6 27/30] Documentation: thermal: Explain the exynos thermal
driver model
On 17-06-2013 02:46, Amit Daniel Kachhap wrote:
> This patch updates the documentation to explain the driver model
> and file layout.
>
> Acked-by: Jonghwa Lee <jonghwa3.lee@...sung.com>
> Acked-by: Kukjin Kim <kgene.kim@...sung.com>
> Signed-off-by: Amit Daniel Kachhap <amit.daniel@...sung.com>
Acked-by: Eduardo Valentin <eduardo.valentin@...com>
> ---
> Documentation/thermal/exynos_thermal | 43 ++++++++++++++++++++++++++-------
> 1 files changed, 34 insertions(+), 9 deletions(-)
>
> diff --git a/Documentation/thermal/exynos_thermal b/Documentation/thermal/exynos_thermal
> index 2b46f67..9010c44 100644
> --- a/Documentation/thermal/exynos_thermal
> +++ b/Documentation/thermal/exynos_thermal
> @@ -1,17 +1,17 @@
> -Kernel driver exynos4_tmu
> +Kernel driver exynos_tmu
> =================
>
> Supported chips:
> -* ARM SAMSUNG EXYNOS4 series of SoC
> - Prefix: 'exynos4-tmu'
> +* ARM SAMSUNG EXYNOS4, EXYNOS5 series of SoC
> Datasheet: Not publicly available
>
> Authors: Donggeun Kim <dg77.kim@...sung.com>
> +Authors: Amit Daniel <amit.daniel@...sung.com>
>
> -Description
> ------------
> +TMU controller Description:
> +---------------------------
>
> -This driver allows to read temperature inside SAMSUNG EXYNOS4 series of SoC.
> +This driver allows to read temperature inside SAMSUNG EXYNOS4/5 series of SoC.
>
> The chip only exposes the measured 8-bit temperature code value
> through a register.
> @@ -34,9 +34,9 @@ The three equations are:
> TI2: Trimming info for 85 degree Celsius (stored at TRIMINFO register)
> Temperature code measured at 85 degree Celsius which is unchanged
>
> -TMU(Thermal Management Unit) in EXYNOS4 generates interrupt
> +TMU(Thermal Management Unit) in EXYNOS4/5 generates interrupt
> when temperature exceeds pre-defined levels.
> -The maximum number of configurable threshold is four.
> +The maximum number of configurable threshold is five.
> The threshold levels are defined as follows:
> Level_0: current temperature > trigger_level_0 + threshold
> Level_1: current temperature > trigger_level_1 + threshold
> @@ -47,6 +47,31 @@ The threshold levels are defined as follows:
> through the corresponding registers.
>
> When an interrupt occurs, this driver notify kernel thermal framework
> -with the function exynos4_report_trigger.
> +with the function exynos_report_trigger.
> Although an interrupt condition for level_0 can be set,
> it can be used to synchronize the cooling action.
> +
> +TMU driver description:
> +-----------------------
> +
> +The exynos thermal driver is structured as,
> +
> + Kernel Core thermal framework
> + (thermal_core.c, step_wise.c, cpu_cooling.c)
> + ^
> + |
> + |
> +TMU configuration data -------> TMU Driver <------> Exynos Core thermal wrapper
> +(exynos_tmu_data.c) (exynos_tmu.c) (exynos_thermal_common.c)
> +(exynos_tmu_data.h) (exynos_tmu.h) (exynos_thermal_common.h)
> +
> +a) TMU configuration data: This consist of TMU register offsets/bitfields
> + described through structure exynos_tmu_registers. Also several
> + other platform data (struct exynos_tmu_platform_data) members
> + are used to configure the TMU.
> +b) TMU driver: This component initialises the TMU controller and sets different
> + thresholds. It invokes core thermal implementation with the call
> + exynos_report_trigger.
> +c) Exynos Core thermal wrapper: This provides 3 wrapper function to use the
> + Kernel core thermal framework. They are exynos_unregister_thermal,
> + exynos_register_thermal and exynos_report_trigger.
>
--
You have got to be excited about what you are doing. (L. Lamport)
Eduardo Valentin
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