gpio: Document proper return value for gpio drivers
The legacy defines GPIOF_DIR_XXX are only for consumers. Document the proper ones. Also: don't use "_XXX" since that's harder to find with "git grep". Just list both of the values. Signed-off-by: Douglas Anderson <dianders@chromium.org> Link: https://lore.kernel.org/r/20200428172322.1.I396f351e364f3c09df7c7606e79abefb8682c092@changeid Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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@ -267,9 +267,9 @@ struct gpio_irq_chip {
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* @free: optional hook for chip-specific deactivation, such as
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* disabling module power and clock; may sleep
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* @get_direction: returns direction for signal "offset", 0=out, 1=in,
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* (same as GPIOF_DIR_XXX), or negative error.
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* It is recommended to always implement this function, even on
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* input-only or output-only gpio chips.
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* (same as GPIO_LINE_DIRECTION_OUT / GPIO_LINE_DIRECTION_IN),
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* or negative error. It is recommended to always implement this
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* function, even on input-only or output-only gpio chips.
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* @direction_input: configures signal "offset" as input, or returns error
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* This can be omitted on input-only or output-only gpio chips.
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* @direction_output: configures signal "offset" as output, or returns error
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