BCM4908_NUM_PINS
pin_names = devm_kasprintf_strarray(dev, "pin", BCM4908_NUM_PINS);
pins = devm_kcalloc(dev, BCM4908_NUM_PINS, sizeof(*pins), GFP_KERNEL);
for (i = 0; i < BCM4908_NUM_PINS; i++) {
pctldesc->npins = BCM4908_NUM_PINS;