linux-kernel - Re: [PATCH 6/6 v6] cpufreq, highbank: add support for highbank cpufreq

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Message-ID: <20121128023240.GA28170@S2100-06.ap.freescale.net>
Date:	Wed, 28 Nov 2012 10:32:42 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Mark Langsdorf <mark.langsdorf@...xeda.com>
CC:	<linux-kernel@...r.kernel.org>, <cpufreq@...r.kernel.org>,
	<linux-pm@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<devicetree-discuss@...ts.ozlabs.org>
Subject: Re: [PATCH 6/6 v6] cpufreq, highbank: add support for highbank
 cpufreq

On Tue, Nov 27, 2012 at 02:04:32PM -0600, Mark Langsdorf wrote:
> Highbank processors depend on the external ECME to perform voltage
> management based on a requested frequency. Communication between the
> A9 cores and the ECME happens over the pl320 IPC channel.

...

> +static int hb_voltage_change(unsigned int freq)
> +{
> +	int i;
> +	u32 msg[7];
> +
> +	msg[0] = HB_CPUFREQ_CHANGE_NOTE;
> +	msg[1] = freq / 1000;
> +	for (i = 2; i < 7; i++)
> +		msg[i] = 0;
> +
> +	return pl320_ipc_transmit(msg);

Is it possible to have this handled inside clk_set_rate() call of cpu
clock?

Shawn

> +}

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