linux-kernel - Re: [PATCH] thermal: Add support for thermal sensor present on SPEAr13xx machines

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Message-Id: <20120224120251.ad8e7332.akpm@linux-foundation.org>
Date:	Fri, 24 Feb 2012 12:02:51 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Viresh Kumar <viresh.kumar@...com>
Cc:	<rui.zhang@...el.com>, <armando.visconti@...com>,
	<shiraz.hashim@...com>, <vipin.kumar@...com>,
	<rajeev-dlh.kumar@...com>, <deepak.sikri@...com>,
	<vipulkumar.samar@...com>, <amit.virdi@...com>,
	<pratyush.anand@...com>, <bhupesh.sharma@...com>,
	<viresh.linux@...il.com>, <bhavna.yadav@...com>,
	<vincenzo.frascino@...com>, <mirko.gardi@...com>,
	<salvatore.dedominicis@...com>, <linux-kernel@...r.kernel.org>,
	<len.brown@...el.com>
Subject: Re: [PATCH] thermal: Add support for thermal sensor present on
 SPEAr13xx machines

On Fri, 24 Feb 2012 12:57:38 +0530
Viresh Kumar <viresh.kumar@...com> wrote:

> From: Vincenzo Frascino <vincenzo.frascino@...com>
> 
> ST's SPEAr13xx machines are based on CortexA9 ARM processors. These
> machines contain a thermal sensor for junction temperature monitoring.
> 
> This patch adds support for this thermal sensor in existing thermal
> framework.
> 
> --- a/drivers/thermal/Kconfig
> +++ b/drivers/thermal/Kconfig
> @@ -18,3 +18,10 @@ config THERMAL_HWMON
>  	depends on THERMAL
>  	depends on HWMON=y || HWMON=THERMAL
>  	default y
> +
> +config SPEAR_THERMAL
> +	bool "SPEAr thermal sensor driver"
> +	depends on THERMAL
> +	help
> +	  Enable this to plug the SPEAr thermal sensor driver into the Linux
> +	  thermal framework

The driver can be compiled for all architectures which support
CONFIG_THERMAL.  This includes x86_64.  Was that intended?

I don't think it's necessarily a bad thing: it gives the driver a lot
more compilation coverage and exposes bugs such as

drivers/thermal/spear_thermal.c: In function 'spear_thermal_probe':
drivers/thermal/spear_thermal.c:159: warning: cast from pointer to integer of different size

--- a/drivers/thermal/spear_thermal.c~thermal-add-support-for-thermal-sensor-present-on-spear13xx-machines-fix
+++ a/drivers/thermal/spear_thermal.c
@@ -156,8 +156,8 @@ static int spear_thermal_probe(struct pl
 
 	platform_set_drvdata(pdev, spear_thermal);
 
-	dev_info(&spear_thermal->device, "Thermal Sensor Loaded at: 0x%x.\n",
-			(unsigned int)stdev->thermal_base);
+	dev_info(&spear_thermal->device, "Thermal Sensor Loaded at: 0x%p.\n",
+			stdev->thermal_base);
 
 	return 0;
 

but I do wonder if this was intentional.

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