linux-kernel - Re: [PATCH 2/3] ARM: msm: Re-organize platsmp to make it extensible

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Message-ID: <20130604093258.GS18614@n2100.arm.linux.org.uk>
Date:	Tue, 4 Jun 2013 10:32:58 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Rohit Vaswani <rvaswani@...eaurora.org>
Cc:	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	David Brown <davidb@...eaurora.org>,
	Daniel Walker <dwalker@...o99.com>,
	Bryan Huntsman <bryanh@...eaurora.org>,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org
Subject: Re: [PATCH 2/3] ARM: msm: Re-organize platsmp to make it extensible

On Mon, Jun 03, 2013 at 05:19:44PM -0700, Rohit Vaswani wrote:
> +	sc1_base_ptr = of_iomap(dn, 0);
> +	if (sc1_base_ptr) {
> +		writel_relaxed(0, sc1_base_ptr + VDD_SC1_ARRAY_CLAMP_GFS_CTL);
> +		writel_relaxed(0, sc1_base_ptr + SCSS_CPU1CORE_RESET);
> +		writel_relaxed(3, sc1_base_ptr + SCSS_DBG_STATUS_CORE_PWRDUP);
> +		mb();
> +		iounmap(sc1_base_ptr);

If you need to fiddle with power rails and resets for your secondary
core, you don't need any of the pen_release stuff, and you really
should get rid of it.  The pen_release stuff is only there for
platforms where there's no proper way of controlling the secondary
CPUs except by using a software method.
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