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authorVignesh R <vigneshr@ti.com>2016-06-09 08:32:04 +0300
committerLinus Walleij <linus.walleij@linaro.org>2016-06-13 10:21:28 +0300
commita246b8198f776a16d1d3a3bbfc2d437bad766b29 (patch)
tree706415a262cac9849cf7134e5831d9e4d31ba57d /drivers/gpio/gpio-pca953x.c
parentc0d30ecfe2f3e2254234d055982536fac18c7f1c (diff)
downloadlinux-a246b8198f776a16d1d3a3bbfc2d437bad766b29.tar.xz
gpio: pca953x: Fix NBANK calculation for PCA9536
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(). Cc: stable@vger.kernel.org Signed-off-by: Vignesh R <vigneshr@ti.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-pca953x.c')
-rw-r--r--drivers/gpio/gpio-pca953x.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index 21b21cd1773b..3969cc014acd 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -90,7 +90,7 @@ 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;