From patchwork Wed Sep 9 08:54:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bartosz Golaszewski X-Patchwork-Id: 1360439 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=bgdev.pl Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=bgdev-pl.20150623.gappssmtp.com header.i=@bgdev-pl.20150623.gappssmtp.com header.a=rsa-sha256 header.s=20150623 header.b=1hogus41; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4BmbSJ4JN4z9sTv for ; Wed, 9 Sep 2020 18:54:56 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726970AbgIIIyi (ORCPT ); Wed, 9 Sep 2020 04:54:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42576 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726440AbgIIIyf (ORCPT ); Wed, 9 Sep 2020 04:54:35 -0400 Received: from mail-wr1-x442.google.com (mail-wr1-x442.google.com [IPv6:2a00:1450:4864:20::442]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CA888C0613ED for ; Wed, 9 Sep 2020 01:54:34 -0700 (PDT) Received: by mail-wr1-x442.google.com with SMTP id c18so2015986wrm.9 for ; Wed, 09 Sep 2020 01:54:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bgdev-pl.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=yjs3H1T57/OsvxujNGQGLBWexjTmuttV9nlq5vhVwiw=; b=1hogus410UbSTewZULq8XN8hOyyBaL3K5B6EOLPEBYnY2sGYGPLbPW3ExsJq4pq4+H GICD3jVw0enYx6Gprar6A5TRJmmt56br+sRooWOV1CwuhcTx+bsn//Px3L+pkoJCOh+m fYwbhRd6W8qaWAXI2rTd6jScVykNjvgR7bNmSjXEZ7TDiBxHT09dlxpG5Ezja1cg/s8A FOAyOQuANxMt5ChTXpvKigtNMY0VAmWUmnKt7iiXAycAGWMUovJrodozixh0MtVmJxen gXRZ4DATBIzKNBdBoi/e96MQ3hAxtrVB9feV6GsGHB4jQ8BKl5oVyhuQNjPFJ0zTIu28 J8Vg== 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=yjs3H1T57/OsvxujNGQGLBWexjTmuttV9nlq5vhVwiw=; b=i0HfYK9Uv2DgOIpRinYQsWTpDm1a4C0vVQ030rCKGuJyMy56WfQytv8QEdwInZ6vcf Q+8zoJ+rc2mu9YMGRNRpmeJf3BNMLLf8JZXFRtfv5g8rZHNR7dXvRGZpLS0E3RaLSMCO TyXOIQx/Gb7R8BmT1JWuPwmFsejACZF1UjBrVA/Afe72lkBtISUez9NhCAUU2cnS3SWh AlTN+R/D1T2famxsavuS/kcIVOP9FuqidWNmzuxcrEZZWHKFeJGzUkHWlo76ZzeRxxYf OrTZFdNWYcyqNsVwitrb/AfV8ppgawyCEYuFcAMNZAZ7lcXGmiUQV3Z7rqa7a/2Cnx95 aHcQ== X-Gm-Message-State: AOAM531Q/6HW4pyQkny3Oay2I8ESCTZg/76rp56sSS/yXc0hdSIxqwz5 NzUiWn0HQmhZyCmKzmfUSSpnwg== X-Google-Smtp-Source: ABdhPJyfX1lAkYRdf3f086UINT2xngPSrOgIgkfFzYyUgZA0LaGJG7CLOAi3E9XKsLi6Ob8wB4E1zg== X-Received: by 2002:a5d:46cd:: with SMTP id g13mr2988799wrs.153.1599641673479; Wed, 09 Sep 2020 01:54:33 -0700 (PDT) Received: from localhost.localdomain (amontpellier-657-1-17-60.w109-210.abo.wanadoo.fr. [109.210.64.60]) by smtp.gmail.com with ESMTPSA id n17sm3418812wrw.0.2020.09.09.01.54.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Sep 2020 01:54:32 -0700 (PDT) From: Bartosz Golaszewski To: Linus Walleij , Mika Westerberg , Andy Shevchenko , Kent Gibson Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH v2 1/3] device: property: add helpers to count items in string arrays Date: Wed, 9 Sep 2020 10:54:24 +0200 Message-Id: <20200909085426.19862-2-brgl@bgdev.pl> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200909085426.19862-1-brgl@bgdev.pl> References: <20200909085426.19862-1-brgl@bgdev.pl> MIME-Version: 1.0 Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org From: Bartosz Golaszewski Instead of doing the following: count = device_property_read_string_array(dev, propname, NULL, 0); Let's provide inline helpers with hardcoded arguments for counting strings in property arrays. Suggested-by: Andy Shevchenko Signed-off-by: Bartosz Golaszewski --- include/linux/property.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/include/linux/property.h b/include/linux/property.h index 9f805c442819..75c178055bc9 100644 --- a/include/linux/property.h +++ b/include/linux/property.h @@ -170,6 +170,12 @@ static inline int device_property_count_u64(struct device *dev, const char *prop return device_property_read_u64_array(dev, propname, NULL, 0); } +static inline int device_property_string_array_count(struct device *dev, + const char *propname) +{ + return device_property_read_string_array(dev, propname, NULL, 0); +} + static inline bool fwnode_property_read_bool(const struct fwnode_handle *fwnode, const char *propname) { @@ -224,6 +230,13 @@ static inline int fwnode_property_count_u64(const struct fwnode_handle *fwnode, return fwnode_property_read_u64_array(fwnode, propname, NULL, 0); } +static inline int +fwnode_property_string_array_count(const struct fwnode_handle *fwnode, + const char *propname) +{ + return fwnode_property_read_string_array(fwnode, propname, NULL, 0); +} + struct software_node; /** From patchwork Wed Sep 9 08:54:25 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bartosz Golaszewski X-Patchwork-Id: 1360438 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=bgdev.pl Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=bgdev-pl.20150623.gappssmtp.com header.i=@bgdev-pl.20150623.gappssmtp.com header.a=rsa-sha256 header.s=20150623 header.b=otUwM2M8; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4BmbS62lKhz9sSP for ; Wed, 9 Sep 2020 18:54:46 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727113AbgIIIyo (ORCPT ); Wed, 9 Sep 2020 04:54:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42580 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725877AbgIIIyg (ORCPT ); Wed, 9 Sep 2020 04:54:36 -0400 Received: from mail-wr1-x443.google.com (mail-wr1-x443.google.com [IPv6:2a00:1450:4864:20::443]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B6E7CC061573 for ; Wed, 9 Sep 2020 01:54:35 -0700 (PDT) Received: by mail-wr1-x443.google.com with SMTP id c18so2016040wrm.9 for ; Wed, 09 Sep 2020 01:54:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bgdev-pl.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=oPMxGpr+QGmkhggb489uiTdIfshLbRulDWZhsNIiQQ0=; b=otUwM2M8fg6sUNUlUOQv2teY8eBLuSSXPA1O+KLiU8GAIx0C5oyXwzkSp1hAEbXzrh wR77Nc+iTZTHpu+qsEOLbTBoEctRA8jwCZa0/+PsOBgdW3urGYxTxwTDv3aFQXEHay4R VG4t1r3jJYZudV92WuzFRg6I4FceUgjC31gcI8yAZoewULhbriw3gv0kpZkMo4KXdChd 1iitu6J8QtcsZq0qp28TDTwjWDaq6hoH0+OVOaGBqyg/b4dbD0QDavtNI5NXFFGq1E1v guSMKpgxPCnGeFw3iDTZ9G36vajzgeEDz/oTfgzC+nu2gQFF1YRhyznQDS7jTCfqlaNo TmJg== 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=oPMxGpr+QGmkhggb489uiTdIfshLbRulDWZhsNIiQQ0=; b=Y69zTdujKkhBIC2XYGMNmiqGe/DRKOtbKZmSwbVssoaE+g2B5u3T2ecB7cvGVyvJhu 4jdixlIDfA9cgfxK2j1blkufsdNNs/aUl6xl7iECJUGOHFDYf1gGofkqfKrGqZH9TsEa T9yOqbyCNHl3xBGgwLKtIARpdGcqvHLFEJAUEf1+uBprEa5cU1Hk8LNhmDY4hV8N0Ely DH9I1y75cJtgo0//yPQ2EpL6wF6qPLrBbU5SoMIo6xzx0wzb3ttQTb1HVUclgdLAXzqe YMp4+UOoMIXUFxHjI0cw44FlBQqnDVxi92alSP58q40cMyklmh+eWSZhw9PhyvmHR8eI LWsg== X-Gm-Message-State: AOAM533z2hhQG0GNlDuLueuoxyH6RWsK9pbLlNBnotYXhIiXQPXwrM92 aX5Mx2G/38Vtlvc6gaGty5T62g== X-Google-Smtp-Source: ABdhPJyjCMVwPB9EVQf6t5VG8C1T/fmtpLMTR9b7o4akg5vT15n4K/Us+Gh0Xbin7xbSiUnFFIYs7A== X-Received: by 2002:adf:8342:: with SMTP id 60mr3177139wrd.158.1599641674463; Wed, 09 Sep 2020 01:54:34 -0700 (PDT) Received: from localhost.localdomain (amontpellier-657-1-17-60.w109-210.abo.wanadoo.fr. [109.210.64.60]) by smtp.gmail.com with ESMTPSA id n17sm3418812wrw.0.2020.09.09.01.54.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Sep 2020 01:54:33 -0700 (PDT) From: Bartosz Golaszewski To: Linus Walleij , Mika Westerberg , Andy Shevchenko , Kent Gibson Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH v2 2/3] gpiolib: generalize devprop_gpiochip_set_names() for device properties Date: Wed, 9 Sep 2020 10:54:25 +0200 Message-Id: <20200909085426.19862-3-brgl@bgdev.pl> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200909085426.19862-1-brgl@bgdev.pl> References: <20200909085426.19862-1-brgl@bgdev.pl> MIME-Version: 1.0 Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org From: Bartosz Golaszewski devprop_gpiochip_set_names() is overly complicated with taking the fwnode argument (which requires using dev_fwnode() & of_fwnode_handle() in ACPI and OF GPIO code respectively). Let's just switch to using the generic device properties. This allows us to pull the code setting line names directly into gpiochip_add_data_with_key() instead of handling it separately for ACPI and OF. Signed-off-by: Bartosz Golaszewski Reviewed-by: Andy Shevchenko --- drivers/gpio/gpiolib-acpi.c | 3 --- drivers/gpio/gpiolib-devprop.c | 20 ++++++++++---------- drivers/gpio/gpiolib-of.c | 5 ----- drivers/gpio/gpiolib.c | 8 ++++---- include/linux/gpio/driver.h | 3 +-- 5 files changed, 15 insertions(+), 24 deletions(-) diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c index 54ca3c18b291..834a12f3219e 100644 --- a/drivers/gpio/gpiolib-acpi.c +++ b/drivers/gpio/gpiolib-acpi.c @@ -1221,9 +1221,6 @@ void acpi_gpiochip_add(struct gpio_chip *chip) return; } - if (!chip->names) - devprop_gpiochip_set_names(chip, dev_fwnode(chip->parent)); - acpi_gpiochip_request_regions(acpi_gpio); acpi_gpiochip_scan_gpios(acpi_gpio); acpi_walk_dep_device_list(handle); diff --git a/drivers/gpio/gpiolib-devprop.c b/drivers/gpio/gpiolib-devprop.c index 26741032fa9e..31599d89a85d 100644 --- a/drivers/gpio/gpiolib-devprop.c +++ b/drivers/gpio/gpiolib-devprop.c @@ -17,25 +17,23 @@ /** * devprop_gpiochip_set_names - Set GPIO line names using device properties * @chip: GPIO chip whose lines should be named, if possible - * @fwnode: Property Node containing the gpio-line-names property * * Looks for device property "gpio-line-names" and if it exists assigns * GPIO line names for the chip. The memory allocated for the assigned - * names belong to the underlying firmware node and should not be released + * names belong to the underlying software node and should not be released * by the caller. */ -void devprop_gpiochip_set_names(struct gpio_chip *chip, - const struct fwnode_handle *fwnode) +int devprop_gpiochip_set_names(struct gpio_chip *chip) { struct gpio_device *gdev = chip->gpiodev; + struct device *dev = chip->parent; const char **names; int ret, i; int count; - count = fwnode_property_read_string_array(fwnode, "gpio-line-names", - NULL, 0); + count = device_property_string_array_count(dev, "gpio-line-names"); if (count < 0) - return; + return 0; if (count > gdev->ngpio) { dev_warn(&gdev->dev, "gpio-line-names is length %d but should be at most length %d", @@ -45,19 +43,21 @@ void devprop_gpiochip_set_names(struct gpio_chip *chip, names = kcalloc(count, sizeof(*names), GFP_KERNEL); if (!names) - return; + return -ENOMEM; - ret = fwnode_property_read_string_array(fwnode, "gpio-line-names", + ret = device_property_read_string_array(dev, "gpio-line-names", names, count); if (ret < 0) { dev_warn(&gdev->dev, "failed to read GPIO line names\n"); kfree(names); - return; + return ret; } for (i = 0; i < count; i++) gdev->descs[i].name = names[i]; kfree(names); + + return 0; } EXPORT_SYMBOL_GPL(devprop_gpiochip_set_names); diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c index bd31dd3b6a75..2f895a2b8411 100644 --- a/drivers/gpio/gpiolib-of.c +++ b/drivers/gpio/gpiolib-of.c @@ -1026,11 +1026,6 @@ int of_gpiochip_add(struct gpio_chip *chip) if (ret) return ret; - /* If the chip defines names itself, these take precedence */ - if (!chip->names) - devprop_gpiochip_set_names(chip, - of_fwnode_handle(chip->of_node)); - of_node_get(chip->of_node); ret = of_gpiochip_scan_gpios(chip); diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 80137c1b3cdc..0d390f0ec32c 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -340,9 +340,6 @@ static int gpiochip_set_desc_names(struct gpio_chip *gc) struct gpio_device *gdev = gc->gpiodev; int i; - if (!gc->names) - return 0; - /* First check all names if they are unique */ for (i = 0; i != gc->ngpio; ++i) { struct gpio_desc *gpio; @@ -621,7 +618,10 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data, INIT_LIST_HEAD(&gdev->pin_ranges); #endif - ret = gpiochip_set_desc_names(gc); + if (gc->names) + ret = gpiochip_set_desc_names(gc); + else + ret = devprop_gpiochip_set_names(gc); if (ret) goto err_remove_from_list; diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h index d1cef5c2715c..56485a040b82 100644 --- a/include/linux/gpio/driver.h +++ b/include/linux/gpio/driver.h @@ -756,8 +756,7 @@ struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *gc, enum gpiod_flags dflags); void gpiochip_free_own_desc(struct gpio_desc *desc); -void devprop_gpiochip_set_names(struct gpio_chip *gc, - const struct fwnode_handle *fwnode); +int devprop_gpiochip_set_names(struct gpio_chip *gc); #ifdef CONFIG_GPIOLIB From patchwork Wed Sep 9 08:54:26 2020 Content-Type: text/plain; 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[109.210.64.60]) by smtp.gmail.com with ESMTPSA id n17sm3418812wrw.0.2020.09.09.01.54.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Sep 2020 01:54:35 -0700 (PDT) From: Bartosz Golaszewski To: Linus Walleij , Mika Westerberg , Andy Shevchenko , Kent Gibson Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH v2 3/3] gpiolib: unexport devprop_gpiochip_set_names() Date: Wed, 9 Sep 2020 10:54:26 +0200 Message-Id: <20200909085426.19862-4-brgl@bgdev.pl> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200909085426.19862-1-brgl@bgdev.pl> References: <20200909085426.19862-1-brgl@bgdev.pl> MIME-Version: 1.0 Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org From: Bartosz Golaszewski Now that devprop_gpiochip_set_names() is only used in a single place inside drivers/gpio/gpiolib.c, there's no need anymore for it to be exported or to even live in its own source file. Pull this function into the core source file for gpiolib. Signed-off-by: Bartosz Golaszewski --- drivers/gpio/Makefile | 1 - drivers/gpio/gpiolib-devprop.c | 63 ---------------------------------- drivers/gpio/gpiolib.c | 47 +++++++++++++++++++++++++ include/linux/gpio/driver.h | 2 -- 4 files changed, 47 insertions(+), 66 deletions(-) delete mode 100644 drivers/gpio/gpiolib-devprop.c diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 4f9abff4f2dc..639275eb4e4d 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -6,7 +6,6 @@ ccflags-$(CONFIG_DEBUG_GPIO) += -DDEBUG obj-$(CONFIG_GPIOLIB) += gpiolib.o obj-$(CONFIG_GPIOLIB) += gpiolib-devres.o obj-$(CONFIG_GPIOLIB) += gpiolib-legacy.o -obj-$(CONFIG_GPIOLIB) += gpiolib-devprop.o obj-$(CONFIG_GPIOLIB) += gpiolib-cdev.o obj-$(CONFIG_OF_GPIO) += gpiolib-of.o obj-$(CONFIG_GPIO_SYSFS) += gpiolib-sysfs.o diff --git a/drivers/gpio/gpiolib-devprop.c b/drivers/gpio/gpiolib-devprop.c deleted file mode 100644 index 31599d89a85d..000000000000 --- a/drivers/gpio/gpiolib-devprop.c +++ /dev/null @@ -1,63 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Device property helpers for GPIO chips. - * - * Copyright (C) 2016, Intel Corporation - * Author: Mika Westerberg - */ - -#include -#include -#include -#include -#include - -#include "gpiolib.h" - -/** - * devprop_gpiochip_set_names - Set GPIO line names using device properties - * @chip: GPIO chip whose lines should be named, if possible - * - * Looks for device property "gpio-line-names" and if it exists assigns - * GPIO line names for the chip. The memory allocated for the assigned - * names belong to the underlying software node and should not be released - * by the caller. - */ -int devprop_gpiochip_set_names(struct gpio_chip *chip) -{ - struct gpio_device *gdev = chip->gpiodev; - struct device *dev = chip->parent; - const char **names; - int ret, i; - int count; - - count = device_property_string_array_count(dev, "gpio-line-names"); - if (count < 0) - return 0; - - if (count > gdev->ngpio) { - dev_warn(&gdev->dev, "gpio-line-names is length %d but should be at most length %d", - count, gdev->ngpio); - count = gdev->ngpio; - } - - names = kcalloc(count, sizeof(*names), GFP_KERNEL); - if (!names) - return -ENOMEM; - - ret = device_property_read_string_array(dev, "gpio-line-names", - names, count); - if (ret < 0) { - dev_warn(&gdev->dev, "failed to read GPIO line names\n"); - kfree(names); - return ret; - } - - for (i = 0; i < count; i++) - gdev->descs[i].name = names[i]; - - kfree(names); - - return 0; -} -EXPORT_SYMBOL_GPL(devprop_gpiochip_set_names); diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 0d390f0ec32c..943a2de340d8 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -358,6 +358,53 @@ static int gpiochip_set_desc_names(struct gpio_chip *gc) return 0; } +/* + * devprop_gpiochip_set_names - Set GPIO line names using device properties + * @chip: GPIO chip whose lines should be named, if possible + * + * Looks for device property "gpio-line-names" and if it exists assigns + * GPIO line names for the chip. The memory allocated for the assigned + * names belong to the underlying software node and should not be released + * by the caller. + */ +static int devprop_gpiochip_set_names(struct gpio_chip *chip) +{ + struct gpio_device *gdev = chip->gpiodev; + struct device *dev = chip->parent; + const char **names; + int ret, i; + int count; + + count = device_property_string_array_count(dev, "gpio-line-names"); + if (count < 0) + return 0; + + if (count > gdev->ngpio) { + dev_warn(&gdev->dev, "gpio-line-names is length %d but should be at most length %d", + count, gdev->ngpio); + count = gdev->ngpio; + } + + names = kcalloc(count, sizeof(*names), GFP_KERNEL); + if (!names) + return -ENOMEM; + + ret = device_property_read_string_array(dev, "gpio-line-names", + names, count); + if (ret < 0) { + dev_warn(&gdev->dev, "failed to read GPIO line names\n"); + kfree(names); + return ret; + } + + for (i = 0; i < count; i++) + gdev->descs[i].name = names[i]; + + kfree(names); + + return 0; +} + static unsigned long *gpiochip_allocate_mask(struct gpio_chip *gc) { unsigned long *p; diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h index 56485a040b82..4a7e295c3640 100644 --- a/include/linux/gpio/driver.h +++ b/include/linux/gpio/driver.h @@ -756,8 +756,6 @@ struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *gc, enum gpiod_flags dflags); void gpiochip_free_own_desc(struct gpio_desc *desc); -int devprop_gpiochip_set_names(struct gpio_chip *gc); - #ifdef CONFIG_GPIOLIB /* lock/unlock as IRQ */