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From:   William Breathitt Gray <vilhelm.gray@gmail.com>
To:     linus.walleij@linaro.org, bgolaszewski@baylibre.com,
        akpm@linux-foundation.org
Cc:     linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arch@vger.kernel.org, andriy.shevchenko@linux.intel.com,
        linux@rasmusvillemoes.dk, yamada.masahiro@socionext.com,
        linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org,
        geert@linux-m68k.org, preid@electromag.com.au, lukas@wunner.de,
        William Breathitt Gray <vilhelm.gray@gmail.com>
Subject: [PATCH v18 14/14] gpio: pca953x: Utilize the for_each_set_clump8 macro
Date:   Wed,  9 Oct 2019 13:14:50 -0400
Message-Id: <3543ffc3668ad4ed4c00e8ebaf14a5559fd6ddf2.1570641097.git.vilhelm.gray@gmail.com>
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Sender: linux-kernel-owner@vger.kernel.org
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Replace verbose implementation in set_multiple callback with
for_each_set_clump8 macro to simplify code and improve clarity.

Cc: Phil Reid <preid@electromag.com.au>
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
---
 drivers/gpio/gpio-pca953x.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index de5d1383f28d..10b669b8f27d 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -10,6 +10,7 @@
 
 #include <linux/acpi.h>
 #include <linux/bits.h>
+#include <linux/bitops.h>
 #include <linux/gpio/driver.h>
 #include <linux/gpio/consumer.h>
 #include <linux/i2c.h>
@@ -456,7 +457,8 @@ static void pca953x_gpio_set_multiple(struct gpio_chip *gc,
 				      unsigned long *mask, unsigned long *bits)
 {
 	struct pca953x_chip *chip = gpiochip_get_data(gc);
-	unsigned int bank_mask, bank_val;
+	unsigned long offset;
+	unsigned long bank_mask;
 	int bank;
 	u8 reg_val[MAX_BANK];
 	int ret;
@@ -466,15 +468,10 @@ static void pca953x_gpio_set_multiple(struct gpio_chip *gc,
 	if (ret)
 		goto exit;
 
-	for (bank = 0; bank < NBANK(chip); bank++) {
-		bank_mask = mask[bank / sizeof(*mask)] >>
-			   ((bank % sizeof(*mask)) * 8);
-		if (bank_mask) {
-			bank_val = bits[bank / sizeof(*bits)] >>
-				  ((bank % sizeof(*bits)) * 8);
-			bank_val &= bank_mask;
-			reg_val[bank] = (reg_val[bank] & ~bank_mask) | bank_val;
-		}
+	for_each_set_clump8(offset, bank_mask, mask, gc->ngpio) {
+		bank = offset / 8;
+		reg_val[bank] &= ~bank_mask;
+		reg_val[bank] |= bitmap_get_value8(bits, offset) & bank_mask;
 	}
 
 	pca953x_write_regs(chip, chip->regs->output, reg_val);
-- 
2.23.0