[PATCH v3 1/4] gpio: syscon: add soc specific callback to assign output value
From: grygorii.strashko@ti.com (Grygorii Strashko)
Date: 2014-09-03 17:05:32
Also in:
linux-devicetree, linux-gpio
Subsystem:
gpio subsystem, the rest · Maintainers:
Linus Walleij, Bartosz Golaszewski, Linus Torvalds
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> --- drivers/gpio/gpio-syscon.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/gpio/gpio-syscon.c b/drivers/gpio/gpio-syscon.c
index 30884fb..d50ff93 100644
--- a/drivers/gpio/gpio-syscon.c
+++ b/drivers/gpio/gpio-syscon.c@@ -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; }
--
1.9.1