linux-kernel - [PATCH v1 1/1] gpio: Remove unused and obsoleted gpio_export

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Date:   Mon,  2 Jan 2023 23:08:50 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        linux-gpio@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-doc-tw-discuss@...ts.sourceforge.net,
        linux-arch@...r.kernel.org
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Jonathan Corbet <corbet@....net>, Alex Shi <alexs@...nel.org>,
        Yanteng Si <siyanteng@...ngson.cn>,
        Hu Haowen <src.res@...il.cn>, Arnd Bergmann <arnd@...db.de>
Subject: [PATCH v1 1/1] gpio: Remove unused and obsoleted gpio_export_link()

gpio_export_link() is legacy and unused API, remove it for good.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 Documentation/driver-api/gpio/legacy.rst                 | 9 ---------
 .../translations/zh_CN/driver-api/gpio/legacy.rst        | 8 --------
 Documentation/translations/zh_TW/gpio.txt                | 9 ---------
 include/asm-generic/gpio.h                               | 6 ------
 include/linux/gpio.h                                     | 8 --------
 5 files changed, 40 deletions(-)

diff --git a/Documentation/driver-api/gpio/legacy.rst b/Documentation/driver-api/gpio/legacy.rst
index e17910cc3271..e3e9d26a60ce 100644
--- a/Documentation/driver-api/gpio/legacy.rst
+++ b/Documentation/driver-api/gpio/legacy.rst
@@ -735,10 +735,6 @@ requested using gpio_request()::
 	/* reverse gpio_export() */
 	void gpio_unexport();
 
-	/* create a sysfs link to an exported GPIO node */
-	int gpio_export_link(struct device *dev, const char *name,
-		unsigned gpio)
-
 After a kernel driver requests a GPIO, it may only be made available in
 the sysfs interface by gpio_export().  The driver can control whether the
 signal direction may change.  This helps drivers prevent userspace code
@@ -748,11 +744,6 @@ This explicit exporting can help with debugging (by making some kinds
 of experiments easier), or can provide an always-there interface that's
 suitable for documenting as part of a board support package.
 
-After the GPIO has been exported, gpio_export_link() allows creating
-symlinks from elsewhere in sysfs to the GPIO sysfs node.  Drivers can
-use this to provide the interface under their own device in sysfs with
-a descriptive name.
-
 
 API Reference
 =============
diff --git a/Documentation/translations/zh_CN/driver-api/gpio/legacy.rst b/Documentation/translations/zh_CN/driver-api/gpio/legacy.rst
index 6399521d0548..8599e253fcc5 100644
--- a/Documentation/translations/zh_CN/driver-api/gpio/legacy.rst
+++ b/Documentation/translations/zh_CN/driver-api/gpio/legacy.rst
@@ -672,10 +672,6 @@ GPIO 控制器的路径类似 /sys/class/gpio/gpiochip42/ (对于从#42 GPIO
 	/* gpio_export()的逆操作 */
 	void gpio_unexport();
 
-	/* 创建一个 sysfs 连接到已导出的 GPIO 节点 */
-	int gpio_export_link(struct device *dev, const char *name,
-		unsigned gpio)
-
 在一个内核驱动申请一个 GPIO 之后，它可以通过 gpio_export()使其在 sysfs
 接口中可见。该驱动可以控制信号方向是否可修改。这有助于防止用户空间代码无意间
 破坏重要的系统状态。
@@ -683,10 +679,6 @@ GPIO 控制器的路径类似 /sys/class/gpio/gpiochip42/ (对于从#42 GPIO
 这个明确的导出有助于(通过使某些实验更容易来)调试，也可以提供一个始终存在的接口，
 与文档配合作为板级支持包的一部分。
 
-在 GPIO 被导出之后，gpio_export_link()允许在 sysfs 文件系统的任何地方
-创建一个到这个 GPIO sysfs 节点的符号链接。这样驱动就可以通过一个描述性的
-名字，在 sysfs 中他们所拥有的设备下提供一个(到这个 GPIO sysfs 节点的)接口。
-
 
 API参考
 =======
diff --git a/Documentation/translations/zh_TW/gpio.txt b/Documentation/translations/zh_TW/gpio.txt
index e3c076dd75a5..abd8e4c0973e 100644
--- a/Documentation/translations/zh_TW/gpio.txt
+++ b/Documentation/translations/zh_TW/gpio.txt
@@ -634,18 +634,9 @@ GPIO 控制器的路徑類似 /sys/class/gpio/gpiochip42/ (對於從#42 GPIO
 	/* gpio_export()的逆操作 */
 	void gpio_unexport();
 
-	/* 創建一個 sysfs 連接到已導出的 GPIO 節點 */
-	int gpio_export_link(struct device *dev, const char *name,
-		unsigned gpio)
-
 在一個內核驅動申請一個 GPIO 之後，它可以通過 gpio_export()使其在 sysfs
 接口中可見。該驅動可以控制信號方向是否可修改。這有助於防止用戶空間代碼無意間
 破壞重要的系統狀態。
 
 這個明確的導出有助於(通過使某些實驗更容易來)調試，也可以提供一個始終存在的接口，
 與文檔配合作爲板級支持包的一部分。
-
-在 GPIO 被導出之後，gpio_export_link()允許在 sysfs 文件系統的任何地方
-創建一個到這個 GPIO sysfs 節點的符號連結。這樣驅動就可以通過一個描述性的
-名字，在 sysfs 中他們所擁有的設備下提供一個(到這個 GPIO sysfs 節點的)接口。
-
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index a7752cf152ce..f79220f614aa 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -103,12 +103,6 @@ static inline int gpio_export(unsigned gpio, bool direction_may_change)
 	return gpiod_export(gpio_to_desc(gpio), direction_may_change);
 }
 
-static inline int gpio_export_link(struct device *dev, const char *name,
-				   unsigned gpio)
-{
-	return gpiod_export_link(dev, name, gpio_to_desc(gpio));
-}
-
 static inline void gpio_unexport(unsigned gpio)
 {
 	gpiod_unexport(gpio_to_desc(gpio));
diff --git a/include/linux/gpio.h b/include/linux/gpio.h
index 346f60bbab30..e94815b3ce1d 100644
--- a/include/linux/gpio.h
+++ b/include/linux/gpio.h
@@ -197,14 +197,6 @@ static inline int gpio_export(unsigned gpio, bool direction_may_change)
 	return -EINVAL;
 }
 
-static inline int gpio_export_link(struct device *dev, const char *name,
-				unsigned gpio)
-{
-	/* GPIO can never have been exported */
-	WARN_ON(1);
-	return -EINVAL;
-}
-
 static inline void gpio_unexport(unsigned gpio)
 {
 	/* GPIO can never have been exported */
-- 
2.35.1