From patchwork Tue Nov 5 02:04:26 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kent Gibson X-Patchwork-Id: 1189279 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="Cb5Drqhw"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 476Y036NTyz9sP6 for ; Tue, 5 Nov 2019 13:05:07 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730286AbfKECFH (ORCPT ); Mon, 4 Nov 2019 21:05:07 -0500 Received: from mail-pg1-f193.google.com ([209.85.215.193]:35057 "EHLO mail-pg1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729524AbfKECFH (ORCPT ); Mon, 4 Nov 2019 21:05:07 -0500 Received: by mail-pg1-f193.google.com with SMTP id q22so5262596pgk.2 for ; Mon, 04 Nov 2019 18:05:06 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=sBInI9S4pojSgWzJhUnUthAYxf7RcezTFnfQ+szOly0=; b=Cb5Drqhwi6srcMsfaJggZDuBEz6ml4bCkcjA6wchHpMAORZyBHzc8PwxcMzrwjiQjy ++tp9MVl4aHooOON/5xTimKhSuFStkCilPIp3oG5EVbfwfyP7iy6oOPeeBqmPk/eiL3h pSsf6McLRJ/AohtRjxxFb5X/21zx5RYKzkvROcM8T7kynmcIaOfO6wlnGhCkVsDMw1Qb K1o5FNBgIVCQtbIt3ek0WjBjnzVV2atrTaDiAY4iycIdzB3/zAfKOecXzv7uaEuP0jRa YwuSNPaXQ/DxfcVjJ+HWiM3nyx9fI8Zz3C3aL3jYEC6VLiTi4IyvkUD/B24OlmN+Zm+s p2kA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=sBInI9S4pojSgWzJhUnUthAYxf7RcezTFnfQ+szOly0=; b=LJG+VLAB1seU8CXhRK69X63EAbDMJRVV0WFyTojdN63Ii31YfE4khW8FSCdMKk9V2J DiQOu0a/Nj4sJ5THBDoZoSPLuZvTEkkVNrxvfWEuMbALM237j2mP4VqF4WaesQ9MJu8p hKEtg7dCni45To04UK+1/pPfLJYlk9sjMwI7zeL35E27kYMp1oWL4ah8UgWaomPrMeZ/ B5EW47dP15gfHByxLUfX1+z21A1sKrV7Kmz1IlOHEutOh9Jy+y7DvW71jMcHNUIh+QaS 7OQ+jn8H6HwVorlXDLocnvgJTOjOmTPJBmy3zjipuZ5si7YNl8ux1qk9ZQGbGoVq+M8r /WnQ== X-Gm-Message-State: APjAAAW1kjZN/+qNxRFyGgrpy0SVCtHKbwvWj7e+7p7NnVoQyEM/Xqss MqGx9UoUwZqj606Jqgkj1qcxjLeWJiHNbw== X-Google-Smtp-Source: APXvYqxaV2DAQgG3ebsiFyDFiv7ouE2/EQTYWJuhCW93Rh8lnlsiBHud2EwgfSZG7lgU+mSiQpZMsA== X-Received: by 2002:a63:e750:: with SMTP id j16mr34229937pgk.30.1572919506080; Mon, 04 Nov 2019 18:05:06 -0800 (PST) Received: from sol.lan (220-235-109-115.dyn.iinet.net.au. [220.235.109.115]) by smtp.gmail.com with ESMTPSA id r184sm11641909pfc.106.2019.11.04.18.05.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 04 Nov 2019 18:05:05 -0800 (PST) From: Kent Gibson To: linux-gpio@vger.kernel.org, bgolaszewski@baylibre.com, linus.walleij@linaro.org, bamv2005@gmail.com Cc: drew@pdp7.com, thomas.petazzoni@bootlin.com, Kent Gibson Subject: [PATCH v6 4/7] gpiolib: add support for biasing output lines Date: Tue, 5 Nov 2019 10:04:26 +0800 Message-Id: <20191105020429.18942-5-warthog618@gmail.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191105020429.18942-1-warthog618@gmail.com> References: <20191105020429.18942-1-warthog618@gmail.com> MIME-Version: 1.0 Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Allow pull up/down bias to be set on output lines. Use case is for open source or open drain applications where internal pull up/down may conflict with external biasing. Signed-off-by: Kent Gibson --- drivers/gpio/gpiolib.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 0ac0a250b17a..f852ff60ae6e 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -556,8 +556,9 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip) (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE))) return -EINVAL; - /* Bias flags only allowed for input mode. */ - if (!(lflags & GPIOHANDLE_REQUEST_INPUT) && + /* Bias flags only allowed for input or output mode. */ + if (!((lflags & GPIOHANDLE_REQUEST_INPUT) || + (lflags & GPIOHANDLE_REQUEST_OUTPUT)) && ((lflags & GPIOHANDLE_REQUEST_BIAS_DISABLE) || (lflags & GPIOHANDLE_REQUEST_BIAS_PULL_UP) || (lflags & GPIOHANDLE_REQUEST_BIAS_PULL_DOWN))) @@ -3168,6 +3169,9 @@ int gpiod_direction_output(struct gpio_desc *desc, int value) } set_output_value: + ret = gpio_set_bias(gc, desc); + if (ret) + return ret; return gpiod_direction_output_raw_commit(desc, value); set_output_flag: