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Tue, 12 Feb 2019 23:09:08 -0800 (PST) Received: from localhost ([122.172.102.63]) by smtp.gmail.com with ESMTPSA id b2sm19014678pgg.87.2019.02.12.23.09.06 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 12 Feb 2019 23:09:06 -0800 (PST) Date: Wed, 13 Feb 2019 12:39:04 +0530 From: Viresh Kumar To: Anson Huang Cc: "robh+dt@kernel.org" , "mark.rutland@arm.com" , "shawnguo@kernel.org" , "s.hauer@pengutronix.de" , "kernel@pengutronix.de" , "festevam@gmail.com" , "catalin.marinas@arm.com" , "will.deacon@arm.com" , "rjw@rjwysocki.net" , Aisheng Dong , Daniel Baluta , Andy Gross , "horms+renesas@verge.net.au" , "heiko@sntech.de" , "arnd@arndb.de" , "bjorn.andersson@linaro.org" , "jagan@amarulasolutions.com" , "enric.balletbo@collabora.com" , "marc.w.gonzalez@free.fr" , "olof@lixom.net" , "devicetree@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "linux-pm@vger.kernel.org" , dl-linux-imx Subject: Re: [PATCH 3/3] cpufreq: imx-sc: add i.mx system controller cpufreq support Message-ID: <20190213070904.3oswrjafy6cqedsr@vireshk-i7> References: <1550027011-7884-1-git-send-email-Anson.Huang@nxp.com> <1550027011-7884-3-git-send-email-Anson.Huang@nxp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1550027011-7884-3-git-send-email-Anson.Huang@nxp.com> User-Agent: NeoMutt/20180323-120-3dd1ac Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 13-02-19, 03:09, Anson Huang wrote: > On NXP's i.MX SoCs with system controller inside, CPU frequency > scaling can ONLY be done by system controller firmware, and it > can ONLY be requested from secure mode, so Linux cpufreq driver has > to call ARM SMC to trap to ARM-Trusted-Firmware to request system > controller firmware to do CPU frequency scaling. > > This patch adds i.MX system controller cpufreq driver support, > when doing CPU frequency scaling, cpufreq driver will do ARM SMC > call and trap to ARM-Trusted-Firmware, then SIP(silicon provider) > service will communicate with system controller for CPU frequenct > scaling. > > Signed-off-by: Anson Huang > --- > drivers/cpufreq/Kconfig.arm | 9 ++ > drivers/cpufreq/Makefile | 1 + > drivers/cpufreq/imx-sc-cpufreq.c | 183 +++++++++++++++++++++++++++++++++++++++ > 3 files changed, 193 insertions(+) > create mode 100644 drivers/cpufreq/imx-sc-cpufreq.c Why can't you use cpufreq-dt driver like everyone else ? -- viresh