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gpio: pca953x: Fix NBANK calculation for PCA9536

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commit a246b8198f upstream.

NBANK() macro assumes that ngpios is a multiple of 8(BANK_SZ) and
hence results in 0 banks for PCA9536 which has just 4 gpios. This is
wrong as PCA9356 has 1 bank with 4 gpios. This results in uninitialized
PCA953X_INVERT register. Fix this by using DIV_ROUND_UP macro in
NBANK().

Signed-off-by: Vignesh R <vigneshr@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vignesh R 2016-06-09 11:02:04 +05:30 committed by Greg Kroah-Hartman
parent 580b1bbcc9
commit 4a2773383f
1 changed files with 1 additions and 1 deletions
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2
drivers/gpio/gpio-pca953x.c
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@ -86,7 +86,7 @@ MODULE_DEVICE_TABLE(acpi, pca953x_acpi_ids);
#define MAX_BANK 5
#define BANK_SZ 8
#define NBANK(chip) (chip->gpio_chip.ngpio / BANK_SZ)
#define NBANK(chip) DIV_ROUND_UP(chip->gpio_chip.ngpio, BANK_SZ)
struct pca953x_chip {
unsigned gpio_start;