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gpiolib: remove unused gpio_cansleep()

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There is not a single user in the entire kernel of this deprecated API,
kill it for good.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Yanteng Si <siyanteng@loongson.cn>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Andy Shevchenko
2023-06-05 15:54:11 +03:00
committed by Bartosz Golaszewski
parent 57e30e00bd
commit 7d0b80647f
7 changed files with 7 additions and 63 deletions
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12
Documentation/driver-api/gpio/legacy.rst
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@@ -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