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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@linux.intel.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Andy Shevchenko 2022-12-11 00:06:00 +02:00 committed by Bartosz Golaszewski
parent b1453d1eb9
commit a87f901b59
1 changed files with 9 additions and 12 deletions
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21
drivers/gpio/gpio-pca953x.c
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@ -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;