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@xxxxxx>
---
drivers/gpio/gpio-syscon.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/gpio/gpio-syscon.c b/drivers/gpio/gpio-syscon.c
index 30884fb..03b4699 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 {
@@ -77,6 +81,11 @@ static void syscon_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
struct syscon_gpio_priv *priv = to_syscon_gpio(chip);
unsigned int offs = priv->data->dat_bit_offset + offset;
+ if (priv->data->set) {
+ priv->data->set(chip, offset, val);
+ return;
+ }
+
regmap_update_bits(priv->syscon,
(offs / SYSCON_REG_BITS) * SYSCON_REG_SIZE,
BIT(offs % SYSCON_REG_BITS),
--
1.7.9.5
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