gpio: 74x164: Implement gpiochip.set_multiple()
This allows to set multiple outputs using a single SPI transfer.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Phil Reid <preid@electromag.com.au>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/gpio-74x164.c b/drivers/gpio/gpio-74x164.c
index c81224f..62291a8 100644
--- a/drivers/gpio/gpio-74x164.c
+++ b/drivers/gpio/gpio-74x164.c
@@ -75,6 +75,29 @@
mutex_unlock(&chip->lock);
}
+static void gen_74x164_set_multiple(struct gpio_chip *gc, unsigned long *mask,
+ unsigned long *bits)
+{
+ struct gen_74x164_chip *chip = gpiochip_get_data(gc);
+ unsigned int i, idx, shift;
+ u8 bank, bankmask;
+
+ mutex_lock(&chip->lock);
+ for (i = 0, bank = chip->registers - 1; i < chip->registers;
+ i++, bank--) {
+ idx = i / sizeof(*mask);
+ shift = i % sizeof(*mask) * BITS_PER_BYTE;
+ bankmask = mask[idx] >> shift;
+ if (!bankmask)
+ continue;
+
+ chip->buffer[bank] &= ~bankmask;
+ chip->buffer[bank] |= bankmask & (bits[idx] >> shift);
+ }
+ __gen_74x164_write_config(chip);
+ mutex_unlock(&chip->lock);
+}
+
static int gen_74x164_direction_output(struct gpio_chip *gc,
unsigned offset, int val)
{
@@ -114,6 +137,7 @@
chip->gpio_chip.direction_output = gen_74x164_direction_output;
chip->gpio_chip.get = gen_74x164_get_value;
chip->gpio_chip.set = gen_74x164_set_value;
+ chip->gpio_chip.set_multiple = gen_74x164_set_multiple;
chip->gpio_chip.base = -1;
chip->registers = nregs;