From patchwork Thu Mar 29 11:10:34 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Claudiu Beznea X-Patchwork-Id: 892716 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-pwm-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=microchip.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 40Bht00Q68z9s0m for ; Thu, 29 Mar 2018 22:12:24 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752584AbeC2LL2 (ORCPT ); Thu, 29 Mar 2018 07:11:28 -0400 Received: from esa5.microchip.iphmx.com ([216.71.150.166]:37631 "EHLO esa5.microchip.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752555AbeC2LL0 (ORCPT ); Thu, 29 Mar 2018 07:11:26 -0400 X-IronPort-AV: E=Sophos;i="5.48,376,1517900400"; d="scan'208";a="10628990" Received: from smtpout.microchip.com (HELO email.microchip.com) ([198.175.253.82]) by esa5.microchip.iphmx.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 29 Mar 2018 04:11:27 -0700 Received: from m18063-ThinkPad-T460p.microchip.com (10.10.76.4) by chn-sv-exch06.mchp-main.com (10.10.76.107) with Microsoft SMTP Server id 14.3.352.0; Thu, 29 Mar 2018 04:11:24 -0700 From: Claudiu Beznea To: , , , , , , CC: , , , Claudiu Beznea Subject: [PATCH v4 8/9] pwm: add documentation for pwm push-pull mode Date: Thu, 29 Mar 2018 14:10:34 +0300 Message-ID: <1522321835-6460-9-git-send-email-claudiu.beznea@microchip.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1522321835-6460-1-git-send-email-claudiu.beznea@microchip.com> References: <1522321835-6460-1-git-send-email-claudiu.beznea@microchip.com> MIME-Version: 1.0 Sender: linux-pwm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pwm@vger.kernel.org Add documentation for PWM push-pull mode. Signed-off-by: Claudiu Beznea Reviewed-by: Rob Herring --- Documentation/devicetree/bindings/pwm/pwm.txt | 2 ++ Documentation/pwm.txt | 16 ++++++++++++++++ include/dt-bindings/pwm/pwm.h | 1 + 3 files changed, 19 insertions(+) diff --git a/Documentation/devicetree/bindings/pwm/pwm.txt b/Documentation/devicetree/bindings/pwm/pwm.txt index 7c8aaac43f92..6a60c0fca112 100644 --- a/Documentation/devicetree/bindings/pwm/pwm.txt +++ b/Documentation/devicetree/bindings/pwm/pwm.txt @@ -49,6 +49,8 @@ Optionally, the pwm-specifier can encode a number of flags (defined in - PWM_MODE_COMPLEMENTARY: PWM complementary working mode (for PWM channels with two outputs); if not specified, the default for PWM channel will be used +- PWM_MODE_PUSH_PULL: PWM push-pull working modes (for PWM channels with +two outputs); if not specified the default for PWM channel will be used Example with optional PWM specifier for inverse polarity and complementary mode: diff --git a/Documentation/pwm.txt b/Documentation/pwm.txt index 912c43da8b48..675f9351fed1 100644 --- a/Documentation/pwm.txt +++ b/Documentation/pwm.txt @@ -128,6 +128,22 @@ channel that was exported. The following properties will then be available: PWML1 |__| |__| |__| |__| <--T--> + Push-pull mode - for PWM channels with two outputs; output waveforms + for a PWM channel in push-pull mode, with normal polarity looks like + this: + __ __ + PWMH __| |________| |________ + __ __ + PWML ________| |________| |__ + <--T--> + + If polarity is inversed: + __ ________ ________ + PWMH |__| |__| + ________ ________ __ + PWML |__| |__| + <--T--> + Where T is the signal period. Implementing a PWM driver diff --git a/include/dt-bindings/pwm/pwm.h b/include/dt-bindings/pwm/pwm.h index b82279cc1787..cd4265bce968 100644 --- a/include/dt-bindings/pwm/pwm.h +++ b/include/dt-bindings/pwm/pwm.h @@ -12,5 +12,6 @@ #define PWM_POLARITY_INVERTED (1 << 0) #define PWM_MODE_COMPLEMENTARY (1 << 1) +#define PWM_MODE_PUSH_PULL (1 << 2) #endif