linux-kernel - Re: [PATCH v5] ARM: imx: Add basic imx6q cpu thermal management

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Message-ID: <20120620142044.GU28394@pengutronix.de>
Date:	Wed, 20 Jun 2012 16:20:44 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Rob Lee <rob.lee@...aro.org>
Cc:	kernel@...gutronix.de, shawn.guo@...aro.org,
	linux@....linux.org.uk, richard.zhao@...escale.com,
	dirk.behme@...bosch.com, amit.kachhap@...aro.org,
	amit.kucheria@...aro.org, lenb@...nel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linaro-dev@...ts.linaro.org, patches@...aro.org
Subject: Re: [PATCH v5] ARM: imx: Add basic imx6q cpu thermal management

On Wed, Jun 20, 2012 at 09:12:51AM -0500, Rob Lee wrote:
> Sascha, thanks for the review.
> 
> >> +
> >> +static struct imx6q_thermal_zone     *th_zone;
> >> +static void __iomem                  *ocotp_base;
> >
> > This is a driver and drivers should generally be multi instance safe.
> >
> 
> I don't understand what this comment is referring to.  Could you elaborate?

Drivers can only be multi instance safe when all variables are inside a
instance specific struct and you pass a pointer to this struct around.
What if the i.MX7 has two different ocotp_base and you want to use this
driver on both ocotp?

Sascha

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