From mboxrd@z Thu Jan 1 00:00:00 1970 From: Viresh Kumar Subject: Re: [PATCH v7 2/3] cpufreq: mediatek: Add MT8173 cpufreq driver Date: Wed, 19 Aug 2015 11:11:20 +0530 Message-ID: <20150819054120.GA3258@linux> References: <20150818102428.GD31148@linux> <1439949906-22177-1-git-send-email-pi-cheng.chen@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <1439949906-22177-1-git-send-email-pi-cheng.chen-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Pi-Cheng Chen Cc: "Rafael J. Wysocki" , Matthias Brugger , Mark Rutland , Bartlomiej Zolnierkiewicz , Michael Turquette , devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-pm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linaro-kernel-cunTk1MwBs8s++Sfvej+rw@public.gmane.org, linux-mediatek-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org List-Id: devicetree@vger.kernel.org On 19-08-15, 10:05, Pi-Cheng Chen wrote: > Mediatek MT8173 is an ARMv8 based quad-core (2*Cortex-A53 and > 2*Cortex-A72) SoC with duall clusters. For each cluster, two voltage > inputs, Vproc and Vsram are supplied by two regulators. For the big > cluster, two regulators come from different PMICs. In this case, when > scaling voltage inputs of the cluster, the voltages of two regulator > inputs need to be controlled by software explicitly under the SoC > specific limitation: > > 100mV < Vsram - Vproc < 200mV > > which is called 'voltage tracking' mechanism. And when scaling the > frequency of cluster clock input, the input MUX need to be parented to > another "intermediate" stable PLL first and reparented to the original > PLL once the original PLL is stable at the target frequency. This patch > implements those mechanisms to enable CPU DVFS support for Mediatek > MT8173 SoC. > > Signed-off-by: Pi-Cheng Chen > Acked-by: Viresh Kumar > --- > > Changes in v7: > - add of_machine_is_compatible() check to be multiplatform friendly Looks fine, thanks. -- viresh -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html