[PATCH v2] gpio: gpio-pca953x: no interrupts with 4-bit devices

[mrpace2@xxxxxxxxx]

The NBANK macro can be extended in order to avoid the underflow:

#define NBANK(chip) (chip->gpio_chip.ngpio == 0 ? 0 : \
    ((chip->gpio_chip.ngpio + (BANK_SZ - 1)) / BANK_SZ))
Resending a modified patch.

Signed-off-by: Frank Edelhaeuser <mrpace2 <at> gmail.com>
---
diff -Nur a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
--- a/drivers/gpio/gpio-pca953x.c 2016-03-10 02:34:56.012345678 +0000
+++ b/drivers/gpio/gpio-pca953x.c 2016-03-10 02:34:56.012345678 +0000
@@ -86,7 +86,8 @@
 #define MAX_BANK 5
 #define BANK_SZ 8

-#define NBANK(chip) (chip->gpio_chip.ngpio / BANK_SZ)
+#define NBANK(chip) (chip->gpio_chip.ngpio == 0 ? 0 : \
+    ((chip->gpio_chip.ngpio + (BANK_SZ - 1)) / BANK_SZ))

 struct pca953x_chip {
  unsigned gpio_start;

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