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gpio: generic: support input-only chips

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Allow chips to indicates that they are input-only and thus cannot set
the output value.  This will be used by the gpio-etraxfs driver.

Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Rabin Vincent
2015-07-22 15:05:18 +02:00
committed by Linus Walleij
parent 1296fba1a3
commit 91492a44b9
2 changed files with 21 additions and 3 deletions
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include/linux/basic_mmio_gpio.h
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@@ -75,5 +75,6 @@ int bgpio_init(struct bgpio_chip *bgc, struct device *dev,
#define BGPIOF_UNREADABLE_REG_DIR BIT(2) /* reg_dir is unreadable */
#define BGPIOF_BIG_ENDIAN_BYTE_ORDER BIT(3)
#define BGPIOF_READ_OUTPUT_REG_SET BIT(4) /* reg_set stores output value */
#define BGPIOF_NO_OUTPUT BIT(5) /* only input */
#endif /* __BASIC_MMIO_GPIO_H */