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gpio: syscon: add soc specific callback to assign output value

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Some SoCs (like Keystone) may require to perform special
sequence of operations to assign output GPIO value, so default
implementation of .set() callback from gpio-syscon driver
can't be used.

Hence, add optional, SoC specific callback to assign output
gpio value.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Grygorii Strashko 2014-09-03 20:05:32 +03:00 committed by Linus Walleij
parent 3af0dbd592
commit 2c341d62eb
1 changed files with 6 additions and 2 deletions
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8
drivers/gpio/gpio-syscon.c
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@ -37,6 +37,8 @@
* dat_bit_offset: Offset (in bits) to the first GPIO bit.
* dir_bit_offset: Optional offset (in bits) to the first bit to switch
* GPIO direction (Used with GPIO_SYSCON_FEAT_DIR flag).
* set: HW specific callback to assigns output value
* for signal "offset"
*/
struct syscon_gpio_data {
@ -45,6 +47,8 @@ struct syscon_gpio_data {
unsigned int bit_count;
unsigned int dat_bit_offset;
unsigned int dir_bit_offset;
void (*set)(struct gpio_chip *chip,
unsigned offset, int value);
};
struct syscon_gpio_priv {
@ -111,7 +115,7 @@ static int syscon_gpio_dir_out(struct gpio_chip *chip, unsigned offset, int val)
BIT(offs % SYSCON_REG_BITS));
}
syscon_gpio_set(chip, offset, val);
priv->data->set(chip, offset, val);
return 0;
}
@ -159,7 +163,7 @@ static int syscon_gpio_probe(struct platform_device *pdev)
if (priv->data->flags & GPIO_SYSCON_FEAT_IN)
priv->chip.direction_input = syscon_gpio_dir_in;
if (priv->data->flags & GPIO_SYSCON_FEAT_OUT) {
priv->chip.set = syscon_gpio_set;
priv->chip.set = priv->data->set ? : syscon_gpio_set;
priv->chip.direction_output = syscon_gpio_dir_out;
}