From patchwork Tue Feb 15 16:54:29 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Danilo Krummrich X-Patchwork-Id: 12747338 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A8387C433EF for ; Tue, 15 Feb 2022 16:54:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237253AbiBOQyn (ORCPT ); Tue, 15 Feb 2022 11:54:43 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:39716 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233779AbiBOQyn (ORCPT ); Tue, 15 Feb 2022 11:54:43 -0500 Received: from hs01.dk-develop.de (hs01.dk-develop.de [173.249.23.66]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 02B4B117C93; Tue, 15 Feb 2022 08:54:32 -0800 (PST) From: Danilo Krummrich To: dmitry.torokhov@gmail.com, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org Cc: linus.walleij@linaro.org, Danilo Krummrich Subject: [PATCH] input: ps2-gpio: enforce GPIOs flag open drain Date: Tue, 15 Feb 2022 17:54:29 +0100 Message-Id: <20220215165429.53764-1-danilokrummrich@dk-develop.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org The PS/2 bus defines the data and clock line be open drain, therefore for both enforce the particular GPIO flags in the driver. Without enforcing to flag at least the clock gpio as open drain we run into the following warning: WARNING: CPU: 1 PID: 40 at drivers/gpio/gpiolib.c:3175 gpiochip_enable_irq+0x54/0x90 gpiochip_enable_irq() warns on a GPIO being configured as output while serving as IRQ source without being flagged as open drain. Signed-off-by: Danilo Krummrich --- drivers/input/serio/ps2-gpio.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/input/serio/ps2-gpio.c b/drivers/input/serio/ps2-gpio.c index 8970b49ea09a..f562f396ba05 100644 --- a/drivers/input/serio/ps2-gpio.c +++ b/drivers/input/serio/ps2-gpio.c @@ -322,14 +322,19 @@ static irqreturn_t ps2_gpio_irq(int irq, void *dev_id) static int ps2_gpio_get_props(struct device *dev, struct ps2_gpio_data *drvdata) { - drvdata->gpio_data = devm_gpiod_get(dev, "data", GPIOD_IN); + enum gpiod_flags gflags; + + /* Enforce open drain, since this is required by the PS/2 bus. */ + gflags = GPIOD_IN | GPIOD_FLAGS_BIT_OPEN_DRAIN; + + drvdata->gpio_data = devm_gpiod_get(dev, "data", gflags); if (IS_ERR(drvdata->gpio_data)) { dev_err(dev, "failed to request data gpio: %ld", PTR_ERR(drvdata->gpio_data)); return PTR_ERR(drvdata->gpio_data); } - drvdata->gpio_clk = devm_gpiod_get(dev, "clk", GPIOD_IN); + drvdata->gpio_clk = devm_gpiod_get(dev, "clk", gflags); if (IS_ERR(drvdata->gpio_clk)) { dev_err(dev, "failed to request clock gpio: %ld", PTR_ERR(drvdata->gpio_clk));