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gpio: generic: provide helpers for reading and writing registers

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Provide helpers wrapping the read_reg() and write_reg() callbacks of the
generic GPIO API that are called directly by many users. This is done to
hide their implementation ahead of moving them into the separate generic
GPIO struct.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20250825-gpio-mmio-gpio-conv-v1-2-356b4b1d5110@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Bartosz Golaszewski 2025-08-25 11:48:43 +02:00
parent 6e376f245f
commit 16397871b6
1 changed files with 31 additions and 0 deletions
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31
include/linux/gpio/generic.h
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@ -100,6 +100,37 @@ gpio_generic_chip_set(struct gpio_generic_chip *chip, unsigned int offset,
return chip->gc.set(&chip->gc, offset, value);
}
/**
* gpio_generic_read_reg() - Read a register using the underlying callback.
* @chip: Generic GPIO chip to use.
* @reg: Register to read.
*
* Returns: value read from register.
*/
static inline unsigned long
gpio_generic_read_reg(struct gpio_generic_chip *chip, void __iomem *reg)
{
if (WARN_ON(!chip->gc.read_reg))
return 0;
return chip->gc.read_reg(reg);
}
/**
* gpio_generic_write_reg() - Write a register using the underlying callback.
* @chip: Generic GPIO chip to use.
* @reg: Register to write to.
* @val: New value to write.
*/
static inline void gpio_generic_write_reg(struct gpio_generic_chip *chip,
void __iomem *reg, unsigned long val)
{
if (WARN_ON(!chip->gc.write_reg))
return;
chip->gc.write_reg(reg, val);
}
#define gpio_generic_chip_lock(gen_gc) \
raw_spin_lock(&(gen_gc)->gc.bgpio_lock)