linux-kernel - [PATCH v2 3/4] gpio: pca953x: Clean up pcal6534_check

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Date:   Sun, 11 Dec 2022 00:06:00 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v2 3/4] gpio: pca953x: Clean up pcal6534_check_register()

The pcal6534_check_register() is a bit too verbose.
Clean up it, by deduplicating some operations and
switching to the modulo operation as on some architectures
/ and % can become a single assembly instruction.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
v2: new patch
 drivers/gpio/gpio-pca953x.c | 21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)

diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index 2c8586b3191f..8aba8df393bd 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -306,6 +306,7 @@ static bool pca953x_check_register(struct pca953x_chip *chip, unsigned int reg,
 static bool pcal6534_check_register(struct pca953x_chip *chip, unsigned int reg,
 				    u32 checkbank)
 {
+	int bank_shift;
 	int bank;
 	int offset;
 
@@ -314,26 +315,22 @@ static bool pcal6534_check_register(struct pca953x_chip *chip, unsigned int reg,
 		 * Handle lack of reserved registers after output port
 		 * configuration register to form a bank.
 		 */
-		int temp = reg - 0x54;
-
-		bank = temp / NBANK(chip);
-		offset = temp - (bank * NBANK(chip));
-		bank += 16;
+		reg -= 0x54;
+		bank_shift = 16;
 	} else if (reg >= 0x30) {
 		/*
 		 * Reserved block between 14h and 2Fh does not align on
 		 * expected bank boundaries like other devices.
 		 */
-		int temp = reg - 0x30;
-
-		bank = temp / NBANK(chip);
-		offset = temp - (bank * NBANK(chip));
-		bank += 8;
+		reg -= 0x30;
+		bank_shift = 8;
 	} else {
-		bank = reg / NBANK(chip);
-		offset = reg - (bank * NBANK(chip));
+		bank_shift = 0;
 	}
 
+	bank = bank_shift + reg / NBANK(chip);
+	offset = reg % NBANK(chip);
+
 	/* Register is not in the matching bank. */
 	if (!(BIT(bank) & checkbank))
 		return false;
-- 
2.35.1