+/**
+ * intel_gpio_to_pin() - Translate from GPIO offset to pin number
+ * @pctrl: Pinctrl structure
+ * @offset: GPIO offset from gpiolib
+ * @commmunity: Community is filled here if not %NULL
+ * @padgrp: Pad group is filled here if not %NULL
+ *
+ * When coming through gpiolib irqchip, the GPIO offset is not
+ * automatically translated to pinctrl pin number. This function can be
+ * used to find out the corresponding pinctrl pin.
+ */
+static int intel_gpio_to_pin(struct intel_pinctrl *pctrl, unsigned offset,
+ const struct intel_community **community,
+ const struct intel_padgroup **padgrp)
+{
+ int i;
+
+ for (i = 0; i < pctrl->ncommunities; i++) {
+ const struct intel_community *comm = &pctrl->communities[i];
+ int j;
+
+ for (j = 0; j < comm->ngpps; j++) {
+ const struct intel_padgroup *pgrp = &comm->gpps[j];
+
+ if (pgrp->gpio_base < 0)
+ continue;
+
+ if (offset >= pgrp->gpio_base &&
+ offset < pgrp->gpio_base + pgrp->size) {
+ int pin;
+
+ pin = pgrp->base + offset - pgrp->gpio_base;
+ if (community)
+ *community = comm;
+ if (padgrp)
+ *padgrp = pgrp;
+
+ return pin;
+ }
+ }
+ }
+
+ return -EINVAL;
+}
+