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Date: Thu, 12 Jan 2023 15:39:42 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
linux-gpio@...r.kernel.org, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-doc-tw-discuss@...ts.sourceforge.net,
linux-m68k@...ts.linux-m68k.org, linux-sh@...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>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Yoshinori Sato <ysato@...rs.sourceforge.jp>,
Rich Felker <dalias@...c.org>
Subject: [PATCH v1 1/1] gpio: Remove unused and obsoleted irq_to_gpio()
irq_to_gpio() is legacy and unused API, remove it for good.
This leaves gpio_to_irq() as it's used yet in many places.
Nevertheless, removal of its counterpart is a good signal
to whoever even trying to consider using them that do not.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
Documentation/driver-api/gpio/legacy.rst | 8 --------
.../translations/zh_CN/driver-api/gpio/legacy.rst | 7 -------
Documentation/translations/zh_TW/gpio.txt | 7 -------
arch/m68k/include/asm/gpio.h | 7 -------
arch/sh/include/asm/gpio.h | 5 -----
include/linux/gpio.h | 12 ------------
6 files changed, 46 deletions(-)
diff --git a/Documentation/driver-api/gpio/legacy.rst b/Documentation/driver-api/gpio/legacy.rst
index e3e9d26a60ce..a0559d93efd1 100644
--- a/Documentation/driver-api/gpio/legacy.rst
+++ b/Documentation/driver-api/gpio/legacy.rst
@@ -387,9 +387,6 @@ map between them using calls like::
/* map GPIO numbers to IRQ numbers */
int gpio_to_irq(unsigned gpio);
- /* map IRQ numbers to GPIO numbers (avoid using this) */
- int irq_to_gpio(unsigned irq);
-
Those return either the corresponding number in the other namespace, or
else a negative errno code if the mapping can't be done. (For example,
some GPIOs can't be used as IRQs.) It is an unchecked error to use a GPIO
@@ -405,11 +402,6 @@ devices, by the board-specific initialization code. Note that IRQ trigger
options are part of the IRQ interface, e.g. IRQF_TRIGGER_FALLING, as are
system wakeup capabilities.
-Non-error values returned from irq_to_gpio() would most commonly be used
-with gpio_get_value(), for example to initialize or update driver state
-when the IRQ is edge-triggered. Note that some platforms don't support
-this reverse mapping, so you should avoid using it.
-
Emulating Open Drain Signals
----------------------------
diff --git a/Documentation/translations/zh_CN/driver-api/gpio/legacy.rst b/Documentation/translations/zh_CN/driver-api/gpio/legacy.rst
index 8599e253fcc5..74fa473bb504 100644
--- a/Documentation/translations/zh_CN/driver-api/gpio/legacy.rst
+++ b/Documentation/translations/zh_CN/driver-api/gpio/legacy.rst
@@ -358,9 +358,6 @@ GPIO 编号是无符号整数;IRQ 编号也是。这些构成了两个逻辑上
/* 映射 GPIO 编号到 IRQ 编号 */
int gpio_to_irq(unsigned gpio);
- /* 映射 IRQ 编号到 GPIO 编号 (尽量避免使用) */
- int irq_to_gpio(unsigned irq);
-
它们的返回值为对应命名空间的相关编号，或是负的错误代码(如果无法映射)。
(例如,某些 GPIO 无法做为 IRQ 使用。)以下的编号错误是未经检测的:使用一个
未通过 gpio_direction_input()配置为输入的 GPIO 编号，或者使用一个
@@ -373,10 +370,6 @@ gpio_to_irq()返回的非错误值可以传递给 request_irq()或者 free_irq()
触发选项是 IRQ 接口的一部分，如 IRQF_TRIGGER_FALLING，系统唤醒能力
也是如此。
-irq_to_gpio()返回的非错误值大多数通常可以被 gpio_get_value()所使用，
-比如在 IRQ 是沿触发时初始化或更新驱动状态。注意某些平台不支持反映射,所以
-你应该尽量避免使用它。
-
模拟开漏信号
------------
diff --git a/Documentation/translations/zh_TW/gpio.txt b/Documentation/translations/zh_TW/gpio.txt
index abd8e4c0973e..1b986bbb0909 100644
--- a/Documentation/translations/zh_TW/gpio.txt
+++ b/Documentation/translations/zh_TW/gpio.txt
@@ -363,9 +363,6 @@ GPIO 編號是無符號整數;IRQ 編號也是。這些構成了兩個邏輯上
/* 映射 GPIO 編號到 IRQ 編號 */
int gpio_to_irq(unsigned gpio);
- /* 映射 IRQ 編號到 GPIO 編號 (儘量避免使用) */
- int irq_to_gpio(unsigned irq);
-
它們的返回值爲對應命名空間的相關編號，或是負的錯誤代碼(如果無法映射)。
(例如,某些 GPIO 無法做爲 IRQ 使用。)以下的編號錯誤是未經檢測的:使用一個
未通過 gpio_direction_input()配置爲輸入的 GPIO 編號，或者使用一個
@@ -378,10 +375,6 @@ gpio_to_irq()返回的非錯誤值可以傳遞給 request_irq()或者 free_irq()
觸發選項是 IRQ 接口的一部分，如 IRQF_TRIGGER_FALLING，系統喚醒能力
也是如此。
-irq_to_gpio()返回的非錯誤值大多數通常可以被 gpio_get_value()所使用，
-比如在 IRQ 是沿觸發時初始化或更新驅動狀態。注意某些平台不支持反映射,所以
-你應該儘量避免使用它。
-
模擬開漏信號
----------------------------
diff --git a/arch/m68k/include/asm/gpio.h b/arch/m68k/include/asm/gpio.h
index a50b27719a58..5cfc0996ba94 100644
--- a/arch/m68k/include/asm/gpio.h
+++ b/arch/m68k/include/asm/gpio.h
@@ -66,13 +66,6 @@ static inline int gpio_to_irq(unsigned gpio)
return __gpio_to_irq(gpio);
}
-static inline int irq_to_gpio(unsigned irq)
-{
- return (irq >= MCFGPIO_IRQ_VECBASE &&
- irq < (MCFGPIO_IRQ_VECBASE + MCFGPIO_IRQ_MAX)) ?
- irq - MCFGPIO_IRQ_VECBASE : -ENXIO;
-}
-
static inline int gpio_cansleep(unsigned gpio)
{
return gpio < MCFGPIO_PIN_MAX ? 0 : __gpio_cansleep(gpio);
diff --git a/arch/sh/include/asm/gpio.h b/arch/sh/include/asm/gpio.h
index d643250f0a0f..588c1380e4cb 100644
--- a/arch/sh/include/asm/gpio.h
+++ b/arch/sh/include/asm/gpio.h
@@ -40,11 +40,6 @@ static inline int gpio_to_irq(unsigned gpio)
return __gpio_to_irq(gpio);
}
-static inline int irq_to_gpio(unsigned int irq)
-{
- return -ENOSYS;
-}
-
#endif /* CONFIG_GPIOLIB */
#endif /* __ASM_SH_GPIO_H */
diff --git a/include/linux/gpio.h b/include/linux/gpio.h
index e94815b3ce1d..85beb236c925 100644
--- a/include/linux/gpio.h
+++ b/include/linux/gpio.h
@@ -81,11 +81,6 @@ static inline int gpio_to_irq(unsigned int gpio)
return __gpio_to_irq(gpio);
}
-static inline int irq_to_gpio(unsigned int irq)
-{
- return -EINVAL;
-}
-
#endif /* ! CONFIG_ARCH_HAVE_CUSTOM_GPIO_H */
/* CONFIG_GPIOLIB: bindings for managed devices that want to request gpios */
@@ -210,13 +205,6 @@ static inline int gpio_to_irq(unsigned gpio)
return -EINVAL;
}
-static inline int irq_to_gpio(unsigned irq)
-{
- /* irq can never have been returned from gpio_to_irq() */
- WARN_ON(1);
- return -EINVAL;
-}
-
static inline int devm_gpio_request(struct device *dev, unsigned gpio,
const char *label)
{
--
2.39.0
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