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gpio: aspeed: Add open-source and open-drain support 

As per the datasheet, manage the IO and value states to implement
open-source/open-drain, but do this by falling back to gpiolib's
emulation.

This commit simply makes the behaviour explicit for clarity, rather than
relying on the implicit return of -ENOTSUPP to trigger the emulation.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Andrew Jeffery 2017-04-07 22:29:02 +09:30 committed by Linus Walleij
parent 5ae4cb94b3
commit c3bafe017c
1 changed files with 4 additions and 0 deletions
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4
drivers/gpio/gpio-aspeed.c
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@ -761,6 +761,10 @@ static int aspeed_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
param == PIN_CONFIG_BIAS_PULL_DOWN ||
param == PIN_CONFIG_DRIVE_STRENGTH)
return pinctrl_gpio_set_config(offset, config);
else if (param == PIN_CONFIG_DRIVE_OPEN_DRAIN ||
param == PIN_CONFIG_DRIVE_OPEN_SOURCE)
/* Return -ENOTSUPP to trigger emulation, as per datasheet */
return -ENOTSUPP;
return -ENOTSUPP;
}