From patchwork Mon May 17 19:28:04 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sander Vanheule X-Patchwork-Id: 440362 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 83F9DC433ED for ; Mon, 17 May 2021 19:28:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 68571611B0 for ; Mon, 17 May 2021 19:28:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233748AbhEQT37 (ORCPT ); Mon, 17 May 2021 15:29:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51750 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232773AbhEQT35 (ORCPT ); Mon, 17 May 2021 15:29:57 -0400 Received: from polaris.svanheule.net (polaris.svanheule.net [IPv6:2a00:c98:2060:a004:1::200]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AD241C061573 for ; Mon, 17 May 2021 12:28:39 -0700 (PDT) Received: from terra.local.svanheule.net (unknown [IPv6:2a02:a03f:eafb:ee01:404a:340a:91cb:c07b]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: sander@svanheule.net) by polaris.svanheule.net (Postfix) with ESMTPSA id 16B581FFBF8; Mon, 17 May 2021 21:28:38 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=svanheule.net; s=mail1707; t=1621279718; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=3q6JoyXSrkPLBoFuPy3yaThUjOXJKmAlTPeZBosKKkc=; b=LOwGCCu/IYFbqsbTPoCSb6E3ENeTVgct/Tp56oZZsi4aw3g2F2GfVsTOvZRdkH9I0hmKHe gl+3TCr1Gkgm4EtEss/qK+deBP77YIWotFro6JAJz5cyK4SEnZ+n1vJ2QTivkFlC8qqlgW 2TjiMNXD2Aip7vvnPzDnPoTCAHGJgPhV+cAmGIAto/FR1wtR5PMU9zdHV4vyMB3dczsmHH 6PXBXkdm3EynCku/qOZrFwSqg4AHS/unJQNXy7d6eu4hi+PYtKWrALkj5cyjtYGWVMKFiQ 2fGkh44iFv+Bt+6X7p2DWw4mOj3m40NKLS64QUJC6glwjecb62OK9GBTgFPHOw== From: Sander Vanheule To: Pavel Machek , Rob Herring , Lee Jones , Mark Brown , Greg Kroah-Hartman , "Rafael J . Wysocki" , Michael Walle , Linus Walleij , Bartosz Golaszewski , linux-leds@vger.kernel.org, devicetree@vger.kernel.org, linux-gpio@vger.kernel.org Cc: Andrew Lunn , Andy Shevchenko , linux-kernel@vger.kernel.org, Sander Vanheule Subject: [PATCH v2 2/7] gpio: regmap: Add configurable dir/value order Date: Mon, 17 May 2021 21:28:04 +0200 Message-Id: X-Mailer: git-send-email 2.31.1 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-leds@vger.kernel.org GPIO chips may not support setting the output value when a pin is configured as an input, although the current implementation assumes this is always possible. Add support for setting pin direction before value. The order defaults to setting the value first, but this can be reversed by setting the regmap_config.no_set_on_input flag, similar to the corresponding flag in the gpio-mmio driver. Signed-off-by: Sander Vanheule --- drivers/gpio/gpio-regmap.c | 20 +++++++++++++++++--- include/linux/gpio/regmap.h | 3 +++ 2 files changed, 20 insertions(+), 3 deletions(-) diff --git a/drivers/gpio/gpio-regmap.c b/drivers/gpio/gpio-regmap.c index 134cedf151a7..1cdb20f8f8b4 100644 --- a/drivers/gpio/gpio-regmap.c +++ b/drivers/gpio/gpio-regmap.c @@ -170,14 +170,25 @@ static int gpio_regmap_direction_input(struct gpio_chip *chip, return gpio_regmap_set_direction(chip, offset, false); } -static int gpio_regmap_direction_output(struct gpio_chip *chip, - unsigned int offset, int value) +static int gpio_regmap_dir_out_val_first(struct gpio_chip *chip, + unsigned int offset, int value) { gpio_regmap_set(chip, offset, value); return gpio_regmap_set_direction(chip, offset, true); } +static int gpio_regmap_dir_out_dir_first(struct gpio_chip *chip, + unsigned int offset, int value) +{ + int err; + + err = gpio_regmap_set_direction(chip, offset, true); + gpio_regmap_set(chip, offset, value); + + return err; +} + void gpio_regmap_set_drvdata(struct gpio_regmap *gpio, void *data) { gpio->driver_data = data; @@ -277,7 +288,10 @@ struct gpio_regmap *gpio_regmap_register(const struct gpio_regmap_config *config if (gpio->reg_dir_in_base || gpio->reg_dir_out_base) { chip->get_direction = gpio_regmap_get_direction; chip->direction_input = gpio_regmap_direction_input; - chip->direction_output = gpio_regmap_direction_output; + if (config->no_set_on_input) + chip->direction_output = gpio_regmap_dir_out_dir_first; + else + chip->direction_output = gpio_regmap_dir_out_val_first; } ret = gpiochip_add_data(chip, gpio); diff --git a/include/linux/gpio/regmap.h b/include/linux/gpio/regmap.h index 334dd928042b..2a732f8f23be 100644 --- a/include/linux/gpio/regmap.h +++ b/include/linux/gpio/regmap.h @@ -30,6 +30,8 @@ struct regmap; * @reg_dir_out_base: (Optional) out setting register base address * @reg_stride: (Optional) May be set if the registers (of the * same type, dat, set, etc) are not consecutive. + * @no_set_on_input: Set if output value can only be set when the direction + * is configured as output. * @ngpio_per_reg: Number of GPIOs per register * @irq_domain: (Optional) IRQ domain if the controller is * interrupt-capable @@ -73,6 +75,7 @@ struct gpio_regmap_config { unsigned int reg_dir_out_base; int reg_stride; int ngpio_per_reg; + bool no_set_on_input; struct irq_domain *irq_domain; int (*reg_mask_xlate)(struct gpio_regmap *gpio, unsigned int base,