From patchwork Thu Dec 13 09:34:18 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joseph Lo X-Patchwork-Id: 1012696 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=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=nvidia.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=nvidia.com header.i=@nvidia.com header.b="Rph6AINk"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 43FpRy64dsz9s4s for ; Thu, 13 Dec 2018 20:34:54 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727461AbeLMJey (ORCPT ); Thu, 13 Dec 2018 04:34:54 -0500 Received: from hqemgate16.nvidia.com ([216.228.121.65]:8111 "EHLO hqemgate16.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727063AbeLMJey (ORCPT ); Thu, 13 Dec 2018 04:34:54 -0500 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate16.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Thu, 13 Dec 2018 01:34:47 -0800 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Thu, 13 Dec 2018 01:34:52 -0800 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Thu, 13 Dec 2018 01:34:52 -0800 Received: from HQMAIL101.nvidia.com (172.20.187.10) by HQMAIL105.nvidia.com (172.20.187.12) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Thu, 13 Dec 2018 09:34:51 +0000 Received: from hqnvemgw01.nvidia.com (172.20.150.20) by HQMAIL101.nvidia.com (172.20.187.10) with Microsoft SMTP Server (TLS) id 15.0.1395.4 via Frontend Transport; Thu, 13 Dec 2018 09:34:51 +0000 Received: from josephl-linux.nvidia.com (Not Verified[10.19.108.132]) by hqnvemgw01.nvidia.com with Trustwave SEG (v7, 5, 8, 10121) id ; Thu, 13 Dec 2018 01:34:51 -0800 From: Joseph Lo To: Thierry Reding , Peter De Schrijver , Jonathan Hunter CC: , , , , Joseph Lo Subject: [PATCH V2 01/21] dt-bindings: clock: tegra124-dfll: Update DFLL binding for PWM regulator Date: Thu, 13 Dec 2018 17:34:18 +0800 Message-ID: <20181213093438.29621-2-josephl@nvidia.com> X-Mailer: git-send-email 2.19.2 In-Reply-To: <20181213093438.29621-1-josephl@nvidia.com> References: <20181213093438.29621-1-josephl@nvidia.com> MIME-Version: 1.0 X-NVConfidentiality: public DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1544693687; bh=rFGSZ0H3Wp9DaEGcVopw2NZQbBN0zr5+WWCzFUB5efw=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:X-NVConfidentiality: Content-Transfer-Encoding:Content-Type; b=Rph6AINkioD+OWK5CQFJLeKcThEead0L71EmGOoFmmHjTAshbqIQerRYj/puoSIjA I1vGXvg5DBScTceJA+sqjqJbCAKqTK3pSpRjy/6p2FuP+HGomGpPGX0zwW+m3yj/wa ht9ZZuxmmqknGYKqAGN+xbasenuvKpNc95VbpoIc7mvWzu88yGImIrx5N3UOMlOkNx Ny6Ty24qPxb9+l6Au0p8ussgw5B2ptkYJCRmVIEUyWB27TvOe4xfSbJhv8XTTS0lUV W9paDq1QoarLVuxFoibbjMkOn4GK1VAFeWQVwX3n7zZVmp0FI76UyOFaEOqWp87Lm8 gbm6Ieqejm7OQ== Sender: linux-tegra-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org From: Peter De Schrijver Add new properties to configure the DFLL PWM regulator support. Cc: devicetree@vger.kernel.org Signed-off-by: Peter De Schrijver Signed-off-by: Joseph Lo --- *V2: - update the binding strings and descriptions for nvidia,pwm-tristate-microvolts nvidia,pwm-min-microvolts nvidia,pwm-voltage-step-microvolts --- .../bindings/clock/nvidia,tegra124-dfll.txt | 79 ++++++++++++++++++- 1 file changed, 77 insertions(+), 2 deletions(-) diff --git a/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt b/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt index dff236f524a7..38e8cc8c70a8 100644 --- a/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt +++ b/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt @@ -8,7 +8,6 @@ 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" @@ -45,10 +44,31 @@ 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 microseconds. +- nvidia,pwm-tristate-microvolts: Regulator voltage in micro volts when PWM + control is disabled and the PWM output is tristated. Note that this voltage is + configured in hardware, typically via a resistor divider. +- nvidia,pwm-min-microvolts: Regulator voltage in micro volts when PWM control + is enabled and PWM output is low. Hence, this is the minimum output voltage + that the regulator supports when PWM control is enabled. +- nvidia,pwm-voltage-step-microvolts: Voltage increase in micro volts + corresponding to a 1/33th increase in duty cycle. Eg the voltage for 2/33th + duty cycle would be: nvidia,pwm-min-microvolts + + nvidia,pwm-voltage-step-microvolts * 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 +96,58 @@ 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>, + <&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"; + + nvidia,sample-rate = <25000>; + nvidia,droop-ctrl = <0x00000f00>; + nvidia,force-mode = <1>; + nvidia,cf = <6>; + nvidia,ci = <0>; + nvidia,cg = <2>; + + nvidia,pwm-min-microvolts = <708000>; /* 708mV */ + nvidia,pwm-period = <2500>; /* 2.5us */ + nvidia,pwm-to-pmic; + nvidia,pwm-tristate-microvolts = <1000000>; + nvidia,pwm-voltage-step-microvolts = <19200>; /* 19.2mV */ + + 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 = ; + }; + }; +};