From patchwork Tue Feb 6 16:34:08 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter De Schrijver X-Patchwork-Id: 869889 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-tegra-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3zbVTX1fPbz9sBW for ; Wed, 7 Feb 2018 03:36:32 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752726AbeBFQf2 (ORCPT ); Tue, 6 Feb 2018 11:35:28 -0500 Received: from hqemgate16.nvidia.com ([216.228.121.65]:16174 "EHLO hqemgate16.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752637AbeBFQeq (ORCPT ); Tue, 6 Feb 2018 11:34:46 -0500 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate16.nvidia.com id ; Tue, 06 Feb 2018 08:34:56 -0800 Received: from HQMAIL108.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Tue, 06 Feb 2018 08:34:45 -0800 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Tue, 06 Feb 2018 08:34:45 -0800 Received: from UKMAIL101.nvidia.com (10.26.138.13) by HQMAIL108.nvidia.com (172.18.146.13) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Tue, 6 Feb 2018 16:34:44 +0000 Received: from tbergstrom-lnx.Nvidia.com (10.21.24.170) by UKMAIL101.nvidia.com (10.26.138.13) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Tue, 6 Feb 2018 16:34:37 +0000 Received: from tbergstrom-lnx.nvidia.com (localhost [127.0.0.1]) by tbergstrom-lnx.Nvidia.com (Postfix) with ESMTP id A19E5F8154D; Tue, 6 Feb 2018 18:34:33 +0200 (EET) From: Peter De Schrijver To: , , , , , , , , , CC: Peter De Schrijver Subject: [PATCH v3 07/11] dt-bindings: tegra: Update DFLL binding for PWM regulator Date: Tue, 6 Feb 2018 18:34:08 +0200 Message-ID: <1517934852-23255-8-git-send-email-pdeschrijver@nvidia.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1517934852-23255-1-git-send-email-pdeschrijver@nvidia.com> References: <1517934852-23255-1-git-send-email-pdeschrijver@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 X-Originating-IP: [10.21.24.170] X-ClientProxiedBy: UKMAIL102.nvidia.com (10.26.138.15) To UKMAIL101.nvidia.com (10.26.138.13) Sender: linux-tegra-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org Add new properties to configure the DFLL PWM regulator support. Also add an example and make the I2C clock only required when I2C support is used. Signed-off-by: Peter De Schrijver --- .../bindings/clock/nvidia,tegra124-dfll.txt | 76 +++++++++++++++++++++- 1 file changed, 74 insertions(+), 2 deletions(-) diff --git a/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt b/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt index dff236f..a4903f7 100644 --- a/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt +++ b/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt @@ -23,7 +23,8 @@ Required properties: - 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. + - i2c: Clock source for the integrated I2C master (only required when + using I2C mode). - resets: Must contain an entry for each entry in reset-names. See ../reset/reset.txt for details. - reset-names: Must include the following entries: @@ -45,10 +46,28 @@ Required properties for the control loop parameters: Optional properties for the control loop parameters: - nvidia,cg-scale: Boolean value, see the field DFLL_PARAMS_CG_SCALE in the TRM. +Optional properties for mode selection: +- nvidia,pwm-to-pmic: Use PWM to control regulator rather then I2C. + Required properties for I2C mode: - nvidia,i2c-fs-rate: I2C transfer rate, if using full speed mode. -Example: +Required properties for PWM mode: +- nvidia,pwm-period: period of PWM square wave in us. +- nvidia,init-uv: Regulator voltage in uV when PWM control is disabled. +- nvidia,align-offset-uv: Regulator voltage in uV when PWM control is enabled + and PWM output is low. +- nvidia,align-step-uv: Voltage increase in uV corresponding to a 1/33th + increase in duty cycle. Eg the voltage for 2/33th duty + cycle would be: + nvidia,align-offset-uv + nvidia,align-step-uv * 2. +- pinctrl-0: I/O pad configuration when PWM control is enabled. +- pinctrl-1: I/O pad configuration when PWM control is disabled. +- pinctrl-names: must include the following entries: + - dvfs_pwm_enable: I/O pad configuration when PWM control is enabled. + - dvfs_pwm_disable: I/O pad configuration when PWM control is disabled. + +Example for I2C: clock@70110000 { compatible = "nvidia,tegra124-dfll"; @@ -76,3 +95,56 @@ clock@70110000 { nvidia,i2c-fs-rate = <400000>; }; + +Example for PWM: + +clock@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 TEGRA210_CLK_DFLL_SOC>, + <&tegra_car TEGRA210_CLK_DFLL_REF>; + clock-names = "soc", "ref"; + resets = <&tegra_car TEGRA124_RST_DFLL_DVCO>; + reset-names = "dvco"; + #clock-cells = <0>; + clock-output-names = "dfllCPU_out"; + nvidia,pwm-to-pmic; + nvidia,init-uv = <1000000>; + nvidia,align-step-uv = <19200>; /* 19.2mV */ + nvidia,align-offset-uv = <708000>; /* 708mV */ + nvidia,sample-rate = <25000>; + nvidia,droop-ctrl = <0x00000f00>; + nvidia,force-mode = <1>; + nvidia,cf = <6>; + nvidia,ci = <0>; + nvidia,cg = <2>; + nvidia,idle-override; + nvidia,one-shot-calibrate; + nvidia,pwm-period = <2500>; /* 2.5us */ + pinctrl-names = "dvfs_pwm_enable", "dvfs_pwm_disable"; + pinctrl-0 = <&dvfs_pwm_active_state>; + pinctrl-1 = <&dvfs_pwm_inactive_state>; +}; + +/* pinmux nodes added for completeness. Binding doc can be found in: + * Documentation/devicetree/bindings/pinctrl/nvidia,tegra210-pinmux.txt + */ + +pinmux: pinmux@700008d4 { + dvfs_pwm_active_state: dvfs_pwm_active { + dvfs_pwm_pbb1 { + nvidia,pins = "dvfs_pwm_pbb1"; + nvidia,tristate = ; + }; + }; + dvfs_pwm_inactive_state: dvfs_pwm_inactive { + dvfs_pwm_pbb1 { + nvidia,pins = "dvfs_pwm_pbb1"; + nvidia,tristate = ; + }; + }; +};