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([2a01:e34:ed2f:f020:516c:4b89:6e4b:aa56]) by smtp.googlemail.com with ESMTPSA id m18sm17882307wrg.97.2019.10.21.07.17.35 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 21 Oct 2019 07:17:40 -0700 (PDT) Subject: Re: [PATCH 0/7] add support for clocksource/clockevent DT selection To: Claudiu.Beznea@microchip.com, robh+dt@kernel.org, mark.rutland@arm.com, linux@armlinux.org.uk, nsekhar@ti.com, bgolaszewski@baylibre.com, monstr@monstr.eu, john@phrozen.org, ralf@linux-mips.org, paul.burton@mips.com, jhogan@kernel.org, lftan@altera.com, tglx@linutronix.de, vgupta@synopsys.com, marc.zyngier@arm.com, patrice.chotard@st.com, mcoquelin.stm32@gmail.com, alexandre.torgue@st.com, eric@anholt.net, wahrenst@gmx.net, f.fainelli@gmail.com, rjui@broadcom.com, sbranden@broadcom.com, bcm-kernel-feedback-list@broadcom.com, linus.walleij@linaro.org, shc_work@mail.ru, kgene@kernel.org, krzk@kernel.org, ysato@users.sourceforge.jp, liviu.dudau@arm.com, sudeep.holla@arm.com, 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<215a1cd3-b1a8-5171-d70c-8d8081038e7f@microchip.com> From: Daniel Lezcano Openpgp: preference=signencrypt Autocrypt: addr=daniel.lezcano@linaro.org; prefer-encrypt=mutual; keydata= mQINBFv/yykBEADDdW8RZu7iZILSf3zxq5y8YdaeyZjI/MaqgnvG/c3WjFaunoTMspeusiFE sXvtg3ehTOoyD0oFjKkHaia1Zpa1m/gnNdT/WvTveLfGA1gH+yGes2Sr53Ht8hWYZFYMZc8V 2pbSKh8wepq4g8r5YI1XUy9YbcTdj5mVrTklyGWA49NOeJz2QbfytMT3DJmk40LqwK6CCSU0 9Ed8n0a+vevmQoRZJEd3Y1qXn2XHys0F6OHCC+VLENqNNZXdZE9E+b3FFW0lk49oLTzLRNIq 0wHeR1H54RffhLQAor2+4kSSu8mW5qB0n5Eb/zXJZZ/bRiXmT8kNg85UdYhvf03ZAsp3qxcr xMfMsC7m3+ADOtW90rNNLZnRvjhsYNrGIKH8Ub0UKXFXibHbafSuq7RqyRQzt01Ud8CAtq+w P9EftUysLtovGpLSpGDO5zQ++4ZGVygdYFr318aGDqCljKAKZ9hYgRimPBToDedho1S1uE6F 6YiBFnI3ry9+/KUnEP6L8Sfezwy7fp2JUNkUr41QF76nz43tl7oersrLxHzj2dYfWUAZWXva wW4IKF5sOPFMMgxoOJovSWqwh1b7hqI+nDlD3mmVMd20VyE9W7AgTIsvDxWUnMPvww5iExlY eIC0Wj9K4UqSYBOHcUPrVOKTcsBVPQA6SAMJlt82/v5l4J0pSQARAQABtCpEYW5pZWwgTGV6 Y2FubyA8ZGFuaWVsLmxlemNhbm9AbGluYXJvLm9yZz6JAlcEEwEIAEECGwEFCwkIBwIGFQoJ 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Ti9/eqZ2RgD9HN1UWo90QRDlBisR83Lte2VJyKCS46R3ZDXwZ1lPflIA/28E8ROelnfJEGdn tlE8uATPPdOxbCYAECy+LQ9mGYIMkJoP/RhDJ9TOOlHUacJKRtothMRSzJoe5Y8j+5KkpO1x u22li/5CZiwjAP3wJ4ffPBjReX/V8T0fLn3PpXG/1hVqkvHSc8M4DXMNU2rYye63Edvy34ia PPgRELHKyq19iu+BqjcT+HRzxIR6H5uHkySPCZTwLBnd2hbKJV1QsoRJ7v8azk66EXNoNU8K lZ2wp0IAbJS4//6pFbAoZWlY/RGu3oxMrbght67fERk7xzdc4Rcfl32d/phGoEQiLMB5ygKv TQT1z7oGVFLQCpE5ALf8ybuta1yjf5Y6uJ2pVeSSj0BxnwCIzme7QXwCpgYqDTLu+QvYs4/y 6zzkvSnnsyohHW6AOchOVNjTHhFhFYn36TuV53laydaXK/zgo3NsOpATFObyK3N5lhb1G9tN Lrev/4WVxNr0LPXl9bdCbQGzIQK+kAPcg8u9f2MMhHQiQX8FAjhP3wtACRhfUz9RaQykxiwv y0s5uI05ZSXhqFs9iLlh3zNU1i6J1cdzA8BReoa3cKz4UiGKEffT857iMvT/ZmgSdYY57EgV UWm57SN2ok2Ii8AXlanH5SJPkbwJZhiB7kO0cjebmoA/1SA+5yTc3zEKKFuxcpfiXxt0d/OJ om6jCJ5/uKB5Cz9bJj0WdlvS2Xb11Jrs90MoVa74H5me4jOw7m9Yyg3qExOFOXUPFL6N Message-ID: <99688909-929a-a1c2-5dfe-be98b50b6328@linaro.org> Date: Mon, 21 Oct 2019 16:17:35 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <215a1cd3-b1a8-5171-d70c-8d8081038e7f@microchip.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org On 21/10/2019 10:58, Claudiu.Beznea@microchip.com wrote: > Hi Daniel, > > On 18.10.2019 23:24, Daniel Lezcano wrote: >> Hi Claudiu, >> >> On 15/10/2019 11:23, Claudiu.Beznea@microchip.com wrote: >> >> [ ... ] >> >>> The timer clock source could be divided by MR.PRES + 1. >>> >>> So, I used the clock-frequency DT binding to let user choose the timer's >>> frequency. Based on the value provided via this DT binding the best clock >>> source and prescaler is chosen via mchp_pit64b_pres_prepare() function. >> >> I'm willing to take the driver but I doubt the purpose of the >> clock-frequency is to let the user choose the frequency. >> > > I found this approach in the following already integrated drivers: > drivers/clocksource/armv7m_systick.c > drivers/clocksource/bcm2835_timer.c > drivers/clocksource/bcm_kona_timer.c > drivers/clocksource/mips-gic-timer.c > drivers/clocksource/mps2-timer.c > drivers/clocksource/timer-qcom.c > drivers/clocksource/arm_arch_timer.c > > Looking through the documentation of these, most of them document this DT > property as the frequency of the clock that drivers the timer, but none of > them seems to have some IP internal dividers so that the timer to tick at > different frequency than the clock that feeds the IP. From the > documentation of the above drivers; > drivers/clocksource/armv7m_systick.c > - clock-frequency : The rate in HZ in input of the ARM SysTick > > drivers/clocksource/bcm2835_timer.c > - clock-frequency : The frequency of the clock that drives the counter, in > Hz. > drivers/clocksource/bcm_kona_timer.c > - clock-frequency: frequency that the clock operates > > drivers/clocksource/mips-gic-timer.c > clock-frequency : Clock frequency at which the GIC timers operate. > drivers/clocksource/mps2-timer.c > - clock-frequency : The rate in HZ in input of the ARM MPS2 timer > > drivers/clocksource/timer-qcom.c > - clock-frequency : The frequency of the debug timer and the general > purpose > timer(s) in Hz in that order. > > > This is why I also chose this DT bindings. > > If you want I can stick to a fixed frequency hard coded in the driver. > Please let me know if this would be OK for you. Yes, the clock-frequency is used to specify the frequency when the information can not be retrieved from the clock. The goal is not to specify a frequency and compute from there a prescalar value. Hardcoding the frequency is fine or hardcode the divider and compute the frequency from the clock rate. -- Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog