From patchwork Fri Jun 2 15:01:06 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Andy Shevchenko X-Patchwork-Id: 13265452 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 EBED5C7EE2E for ; Fri, 2 Jun 2023 15:01:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236385AbjFBPB4 (ORCPT ); Fri, 2 Jun 2023 11:01:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54202 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236402AbjFBPBY (ORCPT ); Fri, 2 Jun 2023 11:01:24 -0400 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5D4B6E7A; Fri, 2 Jun 2023 08:01:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1685718073; x=1717254073; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=9jkSG67O1DWy6YhZ8vJHHqxuMqO8NSaBsVfSQ83Kzaw=; b=B7g7fZBpgA7WPdoyVrxexdH3CzLZ8n7ZMEwFYVBlFDiyh/BznVRKCfPZ UaF1AV+ZE++sKVzkBmKEbZbuiiY66p6jYz8M28A2QQpuGdhejxW/YqzIv egor6jl80hy0ezaBCyolcDcXHnGJrVvMtK19a+2Un1I1GxfVwrogCBgTz qhTRK1o/hnp5PPDLykRGQszwAy7TQaP2UbMswbKuKenY0NdpDTvDZ6oGa IY2cdtw4mks3mTl6Q/huChJJb2fws7HZrFEp0zNM0AQoFVJLO2kThOEpr g5jnaNK8hWmBy/PAoZUFDs1hK/oYkJywZMmc/N9yt4BSdU7JX25JMstyR A==; X-IronPort-AV: E=McAfee;i="6600,9927,10729"; a="384169109" X-IronPort-AV: E=Sophos;i="6.00,213,1681196400"; d="scan'208";a="384169109" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Jun 2023 08:01:08 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10729"; a="797619240" X-IronPort-AV: E=Sophos;i="6.00,213,1681196400"; d="scan'208";a="797619240" Received: from black.fi.intel.com ([10.237.72.28]) by FMSMGA003.fm.intel.com with ESMTP; 02 Jun 2023 08:01:04 -0700 Received: by black.fi.intel.com (Postfix, from userid 1003) id 47DC553A; Fri, 2 Jun 2023 18:01:10 +0300 (EEST) From: Andy Shevchenko To: Andy Shevchenko , Linus Walleij , Arnd Bergmann , linux-gpio@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc-tw-discuss@lists.sourceforge.net, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org Cc: Bartosz Golaszewski , Jonathan Corbet , Alex Shi , Yanteng Si , Hu Haowen , Geert Uytterhoeven , Thomas Bogendoerfer Subject: [PATCH v1 1/1] gpiolib: Remove unused gpio_cansleep() Date: Fri, 2 Jun 2023 18:01:06 +0300 Message-Id: <20230602150106.47783-1-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.40.0.1.gaa8946217a0b MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org There is not a single user in the entire kernel of this deprecated API, kill it for good. Signed-off-by: Andy Shevchenko --- Documentation/driver-api/gpio/legacy.rst | 12 +----------- .../translations/zh_CN/driver-api/gpio/legacy.rst | 14 +++----------- Documentation/translations/zh_TW/gpio.txt | 14 +++----------- arch/m68k/include/asm/mcfgpio.h | 8 -------- arch/mips/include/asm/mach-au1x00/gpio-au1000.h | 5 ----- arch/mips/include/asm/mach-au1x00/gpio-au1300.h | 5 ----- include/linux/gpio.h | 12 ------------ 7 files changed, 7 insertions(+), 63 deletions(-) diff --git a/Documentation/driver-api/gpio/legacy.rst b/Documentation/driver-api/gpio/legacy.rst index 9eda54811faa..b6505914791c 100644 --- a/Documentation/driver-api/gpio/legacy.rst +++ b/Documentation/driver-api/gpio/legacy.rst @@ -165,8 +165,7 @@ Most GPIO controllers can be accessed with memory read/write instructions. Those don't need to sleep, and can safely be done from inside hard (nonthreaded) IRQ handlers and similar contexts. -Use the following calls to access such GPIOs, -for which gpio_cansleep() will always return false (see below):: +Use the following calls to access such GPIOs:: /* GPIO INPUT: return zero or nonzero */ int gpio_get_value(unsigned gpio); @@ -200,13 +199,6 @@ Some GPIO controllers must be accessed using message based busses like I2C or SPI. Commands to read or write those GPIO values require waiting to get to the head of a queue to transmit a command and get its response. This requires sleeping, which can't be done from inside IRQ handlers. - -Platforms that support this type of GPIO distinguish them from other GPIOs -by returning nonzero from this call (which requires a valid GPIO number, -which should have been previously allocated with gpio_request):: - - int gpio_cansleep(unsigned gpio); - To access such GPIOs, a different set of accessors is defined:: /* GPIO INPUT: return zero or nonzero, might sleep */ @@ -215,7 +207,6 @@ To access such GPIOs, a different set of accessors is defined:: /* GPIO OUTPUT, might sleep */ void gpio_set_value_cansleep(unsigned gpio, int value); - Accessing such GPIOs requires a context which may sleep, for example a threaded IRQ handler, and those accessors must be used instead of spinlock-safe accessors without the cansleep() name suffix. @@ -537,7 +528,6 @@ code, which always dispatches through the gpio_chip:: #define gpio_get_value __gpio_get_value #define gpio_set_value __gpio_set_value - #define gpio_cansleep __gpio_cansleep Fancier implementations could instead define those as inline functions with logic optimizing access to specific SOC-based GPIOs. For example, if the diff --git a/Documentation/translations/zh_CN/driver-api/gpio/legacy.rst b/Documentation/translations/zh_CN/driver-api/gpio/legacy.rst index 1bddecf73670..1c939e352129 100644 --- a/Documentation/translations/zh_CN/driver-api/gpio/legacy.rst +++ b/Documentation/translations/zh_CN/driver-api/gpio/legacy.rst @@ -153,8 +153,7 @@ get/set(获取/设置)函数调用没法返回错误,且有可能是配置错误 大多数 GPIO 控制器可以通过内存读/写指令来访问。这些指令不会休眠,可以 安全地在硬(非线程)中断例程和类似的上下文中完成。 -对于那些用 gpio_cansleep()测试总是返回失败的 GPIO(见下文)，使用 -以下的函数访问:: +对于那些 GPIO，使用 以下的函数访问:: /* GPIO 输入:返回零或非零 */ int gpio_get_value(unsigned gpio); @@ -186,11 +185,6 @@ GPIO值是布尔值，零表示低电平，非零表示高电平。当读取一 GPIO 值的命令需要等待其信息排到队首才发送命令，再获得其反馈。期间需要 休眠，这不能在 IRQ 例程(中断上下文)中执行。 -支持此类 GPIO 的平台通过以下函数返回非零值来区分出这种 GPIO。(此函数需要 -一个之前通过 gpio_request 分配到的有效 GPIO 编号):: - - int gpio_cansleep(unsigned gpio); - 为了访问这种 GPIO,内核定义了一套不同的函数:: /* GPIO 输入:返回零或非零 ,可能会休眠 */ @@ -199,7 +193,6 @@ GPIO 值的命令需要等待其信息排到队首才发送命令，再获得其 /* GPIO 输出,可能会休眠 */ void gpio_set_value_cansleep(unsigned gpio, int value); - 访问这样的 GPIO 需要一个允许休眠的上下文，例如线程 IRQ 处理例程，并用以上的 访问函数替换那些没有 cansleep()后缀的自旋锁安全访问函数。 @@ -483,8 +476,8 @@ GPIO 实现者的框架（可选） 为了支持这个框架，一个平台的 Kconfig 文件将会 "select"(选择) ARCH_REQUIRE_GPIOLIB 或 ARCH_WANT_OPTIONAL_GPIOLIB，并让它的 - 包含 ，同时定义三个方法: -gpio_get_value()、gpio_set_value()和 gpio_cansleep()。 + 包含 ，同时定义二个方法: +gpio_get_value()、gpio_set_value()。 它也应提供一个 ARCH_NR_GPIOS 的定义值，这样可以更好地反映该平台 GPIO 的实际数量,节省静态表的空间。(这个定义值应该包含片上系统内建 GPIO 和 @@ -502,7 +495,6 @@ ARCH_WANT_OPTIONAL_GPIOLIB 意味着 gpiolib 核心默认关闭,且用户可以 #define gpio_get_value __gpio_get_value #define gpio_set_value __gpio_set_value - #define gpio_cansleep __gpio_cansleep 这些定义可以用更理想的实现方法替代，那就是使用经过逻辑优化的内联函数来访问 基于特定片上系统的 GPIO。例如,若引用的 GPIO (寄存器位偏移)是常量“12”， diff --git a/Documentation/translations/zh_TW/gpio.txt b/Documentation/translations/zh_TW/gpio.txt index 66bc7f2bbe53..6d5188109f9f 100644 --- a/Documentation/translations/zh_TW/gpio.txt +++ b/Documentation/translations/zh_TW/gpio.txt @@ -161,8 +161,7 @@ get/set(獲取/設置)函數調用沒法返回錯誤,且有可能是配置錯誤 大多數 GPIO 控制器可以通過內存讀/寫指令來訪問。這些指令不會休眠,可以 安全地在硬(非線程)中斷例程和類似的上下文中完成。 -對於那些用 gpio_cansleep()測試總是返回失敗的 GPIO(見下文)，使用 -以下的函數訪問: +對於那些 GPIO，使用 以下的函數訪問: /* GPIO 輸入:返回零或非零 */ int gpio_get_value(unsigned gpio); @@ -193,11 +192,6 @@ GPIO值是布爾值，零表示低電平，非零表示高電平。當讀取一 GPIO 值的命令需要等待其信息排到隊首才發送命令，再獲得其反饋。期間需要 休眠，這不能在 IRQ 例程(中斷上下文)中執行。 -支持此類 GPIO 的平台通過以下函數返回非零值來區分出這種 GPIO。(此函數需要 -一個之前通過 gpio_request 分配到的有效 GPIO 編號): - - int gpio_cansleep(unsigned gpio); - 爲了訪問這種 GPIO,內核定義了一套不同的函數: /* GPIO 輸入:返回零或非零 ,可能會休眠 */ @@ -206,7 +200,6 @@ GPIO 值的命令需要等待其信息排到隊首才發送命令，再獲得其 /* GPIO 輸出,可能會休眠 */ void gpio_set_value_cansleep(unsigned gpio, int value); - 訪問這樣的 GPIO 需要一個允許休眠的上下文，例如線程 IRQ 處理例程，並用以上的 訪問函數替換那些沒有 cansleep()後綴的自旋鎖安全訪問函數。 @@ -449,8 +442,8 @@ GPIO 實現者的框架 (可選) ------- 爲了支持這個框架，一個平台的 Kconfig 文件將會 "select"(選擇) ARCH_REQUIRE_GPIOLIB 或 ARCH_WANT_OPTIONAL_GPIOLIB，並讓它的 - 包含 ，同時定義三個方法: -gpio_get_value()、gpio_set_value()和 gpio_cansleep()。 + 包含 ，同時定義二個方法: +gpio_get_value()、gpio_set_value()。 它也應提供一個 ARCH_NR_GPIOS 的定義值，這樣可以更好地反映該平台 GPIO 的實際數量,節省靜態表的空間。(這個定義值應該包含片上系統內建 GPIO 和 @@ -468,7 +461,6 @@ ARCH_WANT_OPTIONAL_GPIOLIB 意味著 gpiolib 核心默認關閉,且用戶可以 #define gpio_get_value __gpio_get_value #define gpio_set_value __gpio_set_value - #define gpio_cansleep __gpio_cansleep 這些定義可以用更理想的實現方法替代，那就是使用經過邏輯優化的內聯函數來訪問 基於特定片上系統的 GPIO。例如,若引用的 GPIO (寄存器位偏移)是常量「12」， diff --git a/arch/m68k/include/asm/mcfgpio.h b/arch/m68k/include/asm/mcfgpio.h index 2cefe8445980..7abd322c019f 100644 --- a/arch/m68k/include/asm/mcfgpio.h +++ b/arch/m68k/include/asm/mcfgpio.h @@ -34,14 +34,6 @@ static inline void __gpio_set_value(unsigned gpio, int value) __mcfgpio_set_value(gpio, value); } -static inline int __gpio_cansleep(unsigned gpio) -{ - if (gpio < MCFGPIO_PIN_MAX) - return 0; - else - return -EINVAL; -} - static inline int __gpio_to_irq(unsigned gpio) { return -EINVAL; diff --git a/arch/mips/include/asm/mach-au1x00/gpio-au1000.h b/arch/mips/include/asm/mach-au1x00/gpio-au1000.h index adde1fa5097e..82bc2766e2ec 100644 --- a/arch/mips/include/asm/mach-au1x00/gpio-au1000.h +++ b/arch/mips/include/asm/mach-au1x00/gpio-au1000.h @@ -500,11 +500,6 @@ static inline int alchemy_gpio_is_valid(int gpio) alchemy_gpio1_is_valid(gpio); } -static inline int alchemy_gpio_cansleep(int gpio) -{ - return 0; /* Alchemy never gets tired */ -} - static inline int alchemy_gpio_to_irq(int gpio) { return (gpio >= ALCHEMY_GPIO2_BASE) ? diff --git a/arch/mips/include/asm/mach-au1x00/gpio-au1300.h b/arch/mips/include/asm/mach-au1x00/gpio-au1300.h index d16add7ba49d..43d44f384f97 100644 --- a/arch/mips/include/asm/mach-au1x00/gpio-au1300.h +++ b/arch/mips/include/asm/mach-au1x00/gpio-au1300.h @@ -98,11 +98,6 @@ static inline int au1300_gpio_is_valid(unsigned int gpio) return ret; } -static inline int au1300_gpio_cansleep(unsigned int gpio) -{ - return 0; -} - /* hardware remembers gpio 0-63 levels on powerup */ static inline int au1300_gpio_getinitlvl(unsigned int gpio) { diff --git a/include/linux/gpio.h b/include/linux/gpio.h index 88efac969754..7ecc25c543ce 100644 --- a/include/linux/gpio.h +++ b/include/linux/gpio.h @@ -108,11 +108,6 @@ static inline void gpio_set_value(unsigned gpio, int value) return gpiod_set_raw_value(gpio_to_desc(gpio), value); } -static inline int gpio_cansleep(unsigned gpio) -{ - return gpiod_cansleep(gpio_to_desc(gpio)); -} - static inline int gpio_to_irq(unsigned gpio) { return gpiod_to_irq(gpio_to_desc(gpio)); @@ -195,13 +190,6 @@ static inline void gpio_set_value(unsigned gpio, int value) WARN_ON(1); } -static inline int gpio_cansleep(unsigned gpio) -{ - /* GPIO can never have been requested or set as {in,out}put */ - WARN_ON(1); - return 0; -} - static inline int gpio_get_value_cansleep(unsigned gpio) { /* GPIO can never have been requested or set as {in,out}put */