From mboxrd@z Thu Jan 1 00:00:00 1970 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 C3C49CCA486 for ; Wed, 8 Jun 2022 00:42:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1391833AbiFHAme (ORCPT ); Tue, 7 Jun 2022 20:42:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45908 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1383558AbiFGVxS (ORCPT ); Tue, 7 Jun 2022 17:53:18 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6DBB02E6B0; Tue, 7 Jun 2022 12:11:57 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 350A2618E2; Tue, 7 Jun 2022 19:11:57 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4103BC385A5; Tue, 7 Jun 2022 19:11:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1654629116; bh=p64XoYKsCewnEP25aozt6DMdmueR/3Rv9fpOXREktKU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tb6B1ZG848OjVJQTFlCiimSmMse0Vp7PhNF5g9AFh7VDno5VRQdRs/yn8ABfGTuYh yxEJN5BxUMp2cNmk+qQcxcikGv5Y0yogN0D14yJEJ//j/AOu7dqwZehAJ1j2AXcWNp 3Q9x0wf7+yfRO/YAA4ebkYPv0O2vKlH7h4NUp0VE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Stefan Wahren , Florian Fainelli , Bartosz Golaszewski , Linus Walleij , Sasha Levin Subject: [PATCH 5.18 574/879] gpiolib: of: Introduce hook for missing gpio-ranges Date: Tue, 7 Jun 2022 19:01:32 +0200 Message-Id: <20220607165019.516657451@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220607165002.659942637@linuxfoundation.org> References: <20220607165002.659942637@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Stefan Wahren [ Upstream commit 3550bba25d5587a701e6edf20e20984d2ee72c78 ] Since commit 2ab73c6d8323 ("gpio: Support GPIO controllers without pin-ranges") the device tree nodes of GPIO controller need the gpio-ranges property to handle gpio-hogs. Unfortunately it's impossible to guarantee that every new kernel is shipped with an updated device tree binary. In order to provide backward compatibility with those older DTB, we need a callback within of_gpiochip_add_pin_range() so the relevant platform driver can handle this case. Fixes: 2ab73c6d8323 ("gpio: Support GPIO controllers without pin-ranges") Signed-off-by: Stefan Wahren Reviewed-by: Florian Fainelli Tested-by: Florian Fainelli Acked-by: Bartosz Golaszewski Link: https://lore.kernel.org/r/20220409095129.45786-2-stefan.wahren@i2se.com Signed-off-by: Linus Walleij Signed-off-by: Sasha Levin --- drivers/gpio/gpiolib-of.c | 5 +++++ include/linux/gpio/driver.h | 12 ++++++++++++ 2 files changed, 17 insertions(+) diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c index 7e5e51d49d09..6dec81b1f24b 100644 --- a/drivers/gpio/gpiolib-of.c +++ b/drivers/gpio/gpiolib-of.c @@ -931,6 +931,11 @@ static int of_gpiochip_add_pin_range(struct gpio_chip *chip) if (!np) return 0; + if (!of_property_read_bool(np, "gpio-ranges") && + chip->of_gpio_ranges_fallback) { + return chip->of_gpio_ranges_fallback(chip, np); + } + group_names = of_find_property(np, group_names_propname, NULL); for (;; index++) { diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h index 874aabd270c9..48d03eb4e5d8 100644 --- a/include/linux/gpio/driver.h +++ b/include/linux/gpio/driver.h @@ -501,6 +501,18 @@ struct gpio_chip { */ int (*of_xlate)(struct gpio_chip *gc, const struct of_phandle_args *gpiospec, u32 *flags); + + /** + * @of_gpio_ranges_fallback: + * + * Optional hook for the case that no gpio-ranges property is defined + * within the device tree node "np" (usually DT before introduction + * of gpio-ranges). So this callback is helpful to provide the + * necessary backward compatibility for the pin ranges. + */ + int (*of_gpio_ranges_fallback)(struct gpio_chip *gc, + struct device_node *np); + #endif /* CONFIG_OF_GPIO */ }; -- 2.35.1