From patchwork Wed May 13 14:58:35 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mikko Perttunen X-Patchwork-Id: 6397911 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 3F5959F1C2 for ; Wed, 13 May 2015 15:09:36 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 48B222024D for ; Wed, 13 May 2015 15:09:35 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 30398201EF for ; Wed, 13 May 2015 15:09:34 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1YsYEb-0006XB-6k; Wed, 13 May 2015 15:06:09 +0000 Received: from mx1.kapsi.fi ([2001:1bc8:1004::1:25] helo=mail.kapsi.fi) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1YsY9n-0002ET-TP for linux-arm-kernel@lists.infradead.org; Wed, 13 May 2015 15:01:13 +0000 Received: from [2001:708:30:12d0:beee:7bff:fe5b:f272] (helo=katsura.kyla.fi) by mail.kapsi.fi with esmtpsa (TLS1.2:RSA_AES_128_CBC_SHA256:128) (Exim 4.80) (envelope-from ) id 1YsY9D-0003Ig-45; Wed, 13 May 2015 18:00:35 +0300 From: Mikko Perttunen To: swarren@wwwdotorg.org, thierry.reding@gmail.com, gnurou@gmail.com, pdeschrijver@nvidia.com, rjw@rjwysocki.net, viresh.kumar@linaro.org Subject: [PATCH v9 01/17] clk: tegra: Add binding for the Tegra124 DFLL clocksource Date: Wed, 13 May 2015 17:58:35 +0300 Message-Id: <1431529131-16710-2-git-send-email-mikko.perttunen@kapsi.fi> X-Mailer: git-send-email 2.3.0 In-Reply-To: <1431529131-16710-1-git-send-email-mikko.perttunen@kapsi.fi> References: <1431529131-16710-1-git-send-email-mikko.perttunen@kapsi.fi> X-SA-Exim-Connect-IP: 2001:708:30:12d0:beee:7bff:fe5b:f272 X-SA-Exim-Mail-From: mikko.perttunen@kapsi.fi X-SA-Exim-Scanned: No (on mail.kapsi.fi); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150513_080112_160034_A7BE04E5 X-CRM114-Status: GOOD ( 11.06 ) X-Spam-Score: -0.0 (/) Cc: pgaikwad@nvidia.com, mturquette@linaro.org, vinceh@nvidia.com, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, tuomas.tynkkynen@iki.fi, Mikko Perttunen , Tuomas Tynkkynen , pwalmsley@nvidia.com, linux-tegra@vger.kernel.org, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Tuomas Tynkkynen The DFLL is the main clocksource for the fast CPU cluster on Tegra124 and also provides automatic CPU rail voltage scaling as well. The DFLL is a separate IP block from the usual Tegra124 clock-and-reset controller, so it gets its own node in the device tree. Signed-off-by: Tuomas Tynkkynen Signed-off-by: Mikko Perttunen Acked-by: Michael Turquette --- .../bindings/clock/nvidia,tegra124-dfll.txt | 79 ++++++++++++++++++++++ 1 file changed, 79 insertions(+) create mode 100644 Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt diff --git a/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt b/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt new file mode 100644 index 0000000..ee7e5fd --- /dev/null +++ b/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt @@ -0,0 +1,79 @@ +NVIDIA Tegra124 DFLL FCPU clocksource + +This binding uses the common clock binding: +Documentation/devicetree/bindings/clock/clock-bindings.txt + +The DFLL IP block on Tegra is a root clocksource designed for clocking +the fast CPU cluster. It consists of a free-running voltage controlled +oscillator connected to the CPU voltage rail (VDD_CPU), and a closed loop +control module that will automatically adjust the VDD_CPU voltage by +communicating with an off-chip PMIC either via an I2C bus or via PWM signals. +Currently only the I2C mode is supported by these bindings. + +Required properties: +- compatible : should be "nvidia,tegra124-dfll" +- reg : Defines the following set of registers, in the order listed: + - registers for the DFLL control logic. + - registers for the I2C output logic. + - registers for the integrated I2C master controller. + - look-up table RAM for voltage register values. +- interrupts: Should contain the DFLL block interrupt. +- clocks: Must contain an entry for each entry in clock-names. + See clock-bindings.txt for details. +- clock-names: Must include the following entries: + - soc: Clock source for the DFLL control logic. + - ref: The closed loop reference clock + - i2c: Clock source for the integrated I2C master. +- resets: Must contain an entry for each entry in reset-names. + See ../reset/reset.txt for details. +- reset-names: Must include the following entries: + - dvco: Reset control for the DFLL DVCO. +- #clock-cells: Must be 0. +- clock-output-names: Name of the clock output. +- vdd-cpu-supply: Regulator for the CPU voltage rail that the DFLL + hardware will start controlling. The regulator will be queried for + the I2C register, control values and supported voltages. + +Required properties for the control loop parameters: +- nvidia,sample-rate: Sample rate of the DFLL control loop. +- nvidia,droop-ctrl: See the register CL_DVFS_DROOP_CTRL in the TRM. +- nvidia,force-mode: See the field DFLL_PARAMS_FORCE_MODE in the TRM. +- nvidia,cf: Numeric value, see the field DFLL_PARAMS_CF_PARAM in the TRM. +- nvidia,ci: Numeric value, see the field DFLL_PARAMS_CI_PARAM in the TRM. +- nvidia,cg: Numeric value, see the field DFLL_PARAMS_CG_PARAM in the TRM. + +Optional properties for the control loop parameters: +- nvidia,cg-scale: Boolean value, see the field DFLL_PARAMS_CG_SCALE in the TRM. + +Required properties for I2C mode: +- nvidia,i2c-fs-rate: I2C transfer rate, if using full speed mode. + +Example: + +clock@0,70110000 { + compatible = "nvidia,tegra124-dfll"; + reg = <0 0x70110000 0 0x100>, /* DFLL control */ + <0 0x70110000 0 0x100>, /* I2C output control */ + <0 0x70110100 0 0x100>, /* Integrated I2C controller */ + <0 0x70110200 0 0x100>; /* Look-up table RAM */ + interrupts = ; + clocks = <&tegra_car TEGRA124_CLK_DFLL_SOC>, + <&tegra_car TEGRA124_CLK_DFLL_REF>, + <&tegra_car TEGRA124_CLK_I2C5>; + clock-names = "soc", "ref", "i2c"; + resets = <&tegra_car TEGRA124_RST_DFLL_DVCO>; + reset-names = "dvco"; + #clock-cells = <0>; + clock-output-names = "dfllCPU_out"; + vdd-cpu-supply = <&vdd_cpu>; + status = "okay"; + + nvidia,sample-rate = <12500>; + nvidia,droop-ctrl = <0x00000f00>; + nvidia,force-mode = <1>; + nvidia,cf = <10>; + nvidia,ci = <0>; + nvidia,cg = <2>; + + nvidia,i2c-fs-rate = <400000>; +};