From mboxrd@z Thu Jan 1 00:00:00 1970 From: Shawn Guo Subject: Re: [PATCH 6/6 v6] cpufreq, highbank: add support for highbank cpufreq Date: Wed, 28 Nov 2012 10:32:42 +0800 Message-ID: <20121128023240.GA28170@S2100-06.ap.freescale.net> References: <1351631056-25938-1-git-send-email-mark.langsdorf@calxeda.com> <1354046672-7392-1-git-send-email-mark.langsdorf@calxeda.com> <1354046672-7392-7-git-send-email-mark.langsdorf@calxeda.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <1354046672-7392-7-git-send-email-mark.langsdorf-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: devicetree-discuss-bounces+gldd-devicetree-discuss=m.gmane.org-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org Sender: "devicetree-discuss" To: Mark Langsdorf Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, cpufreq-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-pm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: devicetree@vger.kernel.org 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 > +}