gpio_latch_priv
struct gpio_latch_priv *priv = gpiochip_get_data(gc);
static bool gpio_latch_can_sleep(struct gpio_latch_priv *priv, unsigned int n_latches)
struct gpio_latch_priv *priv;
static int gpio_latch_set_unlocked(struct gpio_latch_priv *priv,
struct gpio_latch_priv *priv = gpiochip_get_data(gc);