[PATCH v17 10/14] gpio: 74x164: Utilize the for_each_set_clump8 macro

[William Breathitt Gray]

Replace verbose implementation in set_multiple callback with
for_each_set_clump8 macro to simplify code and improve clarity.

Suggested-by: Andy Shevchenko <andriy.shevche...@linux.intel.com>
Cc: Geert Uytterhoeven <geert+rene...@glider.be>
Cc: Phil Reid <pr...@electromag.com.au>
Signed-off-by: William Breathitt Gray <vilhelm.g...@gmail.com>
---
 drivers/gpio/gpio-74x164.c | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/drivers/gpio/gpio-74x164.c b/drivers/gpio/gpio-74x164.c
index e81307f9754e..05637d585152 100644
--- a/drivers/gpio/gpio-74x164.c
+++ b/drivers/gpio/gpio-74x164.c
@@ -6,6 +6,7 @@
  *  Copyright (C) 2010 Miguel Gaio <miguel.g...@efixo.com>
  */
 
+#include <linux/bitops.h>
 #include <linux/gpio/consumer.h>
 #include <linux/gpio/driver.h>
 #include <linux/module.h>
@@ -72,20 +73,18 @@ 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;
+       unsigned long offset;
+       unsigned long bankmask;
+       size_t bank;
+       unsigned long bitmask;
 
        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;
+       for_each_set_clump8(offset, bankmask, mask, chip->registers * 8) {
+               bank = chip->registers - 1 - offset / 8;
+               bitmask = bitmap_get_value8(bits, offset) & bankmask;
 
                chip->buffer[bank] &= ~bankmask;
-               chip->buffer[bank] |= bankmask & (bits[idx] >> shift);
+               chip->buffer[bank] |= bitmask;
        }
        __gen_74x164_write_config(chip);
        mutex_unlock(&chip->lock);
-- 
2.23.0