pinctrl: single: parse #pinctrl-cells = 2

If "pinctrl-single,pins" has 3 arguments (offset, conf, mux), then
pcs_parse_one_pinctrl_entry() does an OR operation on conf and mux to
get the value to store in the register.
Signed-off-by: Drew Fustini <drew@beagleboard.org>
Acked-by: Tony Lindgren <tony@atomide.com>
Acked-by: Haojian Zhuang <haojian.zhuang@linaro.org>
Link: https://lore.kernel.org/r/20200701013320.130441-2-drew@beagleboard.orgSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-single.c

@@ -1017,10 +1017,17 @@ static int pcs_parse_one_pinctrl_entry(struct pcs_device *pcs,
 			break;
 		}
 
-		/* Index plus one value cell */
 		offset = pinctrl_spec.args[0];
 		vals[found].reg = pcs->base + offset;
-		vals[found].val = pinctrl_spec.args[1];
+
+		switch (pinctrl_spec.args_count) {
+		case 2:
+			vals[found].val = pinctrl_spec.args[1];
+			break;
+		case 3:
+			vals[found].val = (pinctrl_spec.args[1] | pinctrl_spec.args[2]);
+			break;
+		}
 
 		dev_dbg(pcs->dev, "%pOFn index: 0x%x value: 0x%x\n",
 			pinctrl_spec.np, offset, pinctrl_spec.args[1]);