Commit 68a44485 authored by Vignesh R's avatar Vignesh R Committed by Willy Tarreau

gpio: pca953x: Fix NBANK calculation for PCA9536

commit a246b819 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().

Cc: stable@vger.kernel.org
Signed-off-by: default avatarVignesh R <vigneshr@ti.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarWilly Tarreau <w@1wt.eu>
parent 3787fb66
......@@ -75,7 +75,7 @@ MODULE_DEVICE_TABLE(i2c, pca953x_id);
#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;
......
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