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gpiolib: Initialize the hardware with a callback

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After changing the drivers to use GPIO core to add an IRQ chip
it appears that some of them requires a hardware initialization
before adding the IRQ chip.

Add an optional callback ->init_hw() to allow that drivers
to initialize hardware if needed.

This change is a part of the fix NULL pointer dereference
brought to the several drivers recently.

Cc: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Andy Shevchenko 2019-10-09 17:34:44 +03:00 • committed by Linus Walleij
parent 6658f87f21
commit 9411e3aaa6
2 changed files with 29 additions and 1 deletions
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8
include/linux/gpio/driver.h
View file

@ -201,6 +201,14 @@ struct gpio_irq_chip {
*/
bool threaded;
/**
* @init_hw: optional routine to initialize hardware before
* an IRQ chip will be added. This is quite useful when
* a particular driver wants to clear IRQ related registers
* in order to avoid undesired events.
*/
int (*init_hw)(struct gpio_chip *chip);
/**
* @init_valid_mask: optional routine to initialize @valid_mask, to be
* used if not all GPIO lines are valid interrupts. Sometimes some