pinctrl: single: set function mask as optional

Since Hisilicon's pin controller is divided into two parts. One is the
function mux, and the other is pin configuration. These two parts are
in the different memory regions. So make pinctrl-single,function-mask
as optional property. Then we can define pingroups without valid
function mux that is only used for pin configuration.

Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
index f4bc602..f9596fe 100644
--- a/drivers/pinctrl/pinctrl-single.c
+++ b/drivers/pinctrl/pinctrl-single.c
@@ -350,6 +350,9 @@
 	int i;
 
 	pcs = pinctrl_dev_get_drvdata(pctldev);
+	/* If function mask is null, needn't enable it. */
+	if (!pcs->fmask)
+		return 0;
 	func = radix_tree_lookup(&pcs->ftree, fselector);
 	if (!func)
 		return -EINVAL;
@@ -384,6 +387,10 @@
 	int i;
 
 	pcs = pinctrl_dev_get_drvdata(pctldev);
+	/* If function mask is null, needn't disable it. */
+	if (!pcs->fmask)
+		return;
+
 	func = radix_tree_lookup(&pcs->ftree, fselector);
 	if (!func) {
 		dev_err(pcs->dev, "%s could not find function%i\n",
@@ -427,6 +434,10 @@
 	int mux_bytes = 0;
 	unsigned data;
 
+	/* If function mask is null, return directly. */
+	if (!pcs->fmask)
+		return -ENOTSUPP;
+
 	list_for_each_safe(pos, tmp, &pcs->gpiofuncs) {
 		frange = list_entry(pos, struct pcs_gpiofunc_range, node);
 		if (pin >= frange->offset + frange->npins
@@ -969,10 +980,17 @@
 	PCS_GET_PROP_U32("pinctrl-single,register-width", &pcs->width,
 			 "register width not specified\n");
 
-	PCS_GET_PROP_U32("pinctrl-single,function-mask", &pcs->fmask,
-			 "function register mask not specified\n");
-	pcs->fshift = ffs(pcs->fmask) - 1;
-	pcs->fmax = pcs->fmask >> pcs->fshift;
+	ret = of_property_read_u32(np, "pinctrl-single,function-mask",
+				   &pcs->fmask);
+	if (!ret) {
+		pcs->fshift = ffs(pcs->fmask) - 1;
+		pcs->fmax = pcs->fmask >> pcs->fshift;
+	} else {
+		/* If mask property doesn't exist, function mux is invalid. */
+		pcs->fmask = 0;
+		pcs->fshift = 0;
+		pcs->fmax = 0;
+	}
 
 	ret = of_property_read_u32(np, "pinctrl-single,function-off",
 					&pcs->foff);