--- zzzz-none-000/linux-3.10.107/drivers/pinctrl/pinmux.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/pinctrl/pinmux.c	2021-02-04 17:41:59.000000000 +0000
@@ -41,7 +41,7 @@
 	    !ops->get_functions_count ||
 	    !ops->get_function_name ||
 	    !ops->get_function_groups ||
-	    !ops->enable) {
+	    !ops->set_mux) {
 		dev_err(pctldev->dev, "pinmux ops lacks necessary functions\n");
 		return -EINVAL;
 	}
@@ -107,6 +107,13 @@
 				desc->name, desc->gpio_owner, owner);
 			goto out;
 		}
+		if (ops->strict && desc->mux_usecount &&
+		    strcmp(desc->mux_owner, owner)) {
+			dev_err(pctldev->dev,
+				"pin %s already requested by %s; cannot claim for %s\n",
+				desc->name, desc->mux_owner, owner);
+			goto out;
+		}
 
 		desc->gpio_owner = owner;
 	} else {
@@ -116,6 +123,12 @@
 				desc->name, desc->mux_owner, owner);
 			goto out;
 		}
+		if (ops->strict && desc->gpio_owner) {
+			dev_err(pctldev->dev,
+				"pin %s already requested by %s; cannot claim for %s\n",
+				desc->name, desc->gpio_owner, owner);
+			goto out;
+		}
 
 		desc->mux_usecount++;
 		if (desc->mux_usecount > 1)
@@ -300,8 +313,7 @@
 
 	/* See if this pctldev has this function */
 	while (selector < nfuncs) {
-		const char *fname = ops->get_function_name(pctldev,
-							   selector);
+		const char *fname = ops->get_function_name(pctldev, selector);
 
 		if (!strcmp(function, fname))
 			return selector;
@@ -309,8 +321,7 @@
 		selector++;
 	}
 
-	pr_err("%s does not support function %s\n",
-	       pinctrl_dev_get_name(pctldev), function);
+	dev_err(pctldev->dev, "function '%s' not supported\n", function);
 	return -EINVAL;
 }
 
@@ -391,19 +402,25 @@
 	struct pinctrl_dev *pctldev = setting->pctldev;
 	const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
 	const struct pinmux_ops *ops = pctldev->desc->pmxops;
-	int ret;
-	const unsigned *pins;
-	unsigned num_pins;
+	int ret = 0;
+	const unsigned *pins = NULL;
+	unsigned num_pins = 0;
 	int i;
 	struct pin_desc *desc;
 
-	ret = pctlops->get_group_pins(pctldev, setting->data.mux.group,
-				      &pins, &num_pins);
+	if (pctlops->get_group_pins)
+		ret = pctlops->get_group_pins(pctldev, setting->data.mux.group,
+					      &pins, &num_pins);
+
 	if (ret) {
+		const char *gname;
+
 		/* errors only affect debug data, so just warn */
+		gname = pctlops->get_group_name(pctldev,
+						setting->data.mux.group);
 		dev_warn(pctldev->dev,
-			 "could not get pins for group selector %d\n",
-			 setting->data.mux.group);
+			 "could not get pins for group %s\n",
+			 gname);
 		num_pins = 0;
 	}
 
@@ -411,9 +428,18 @@
 	for (i = 0; i < num_pins; i++) {
 		ret = pin_request(pctldev, pins[i], setting->dev_name, NULL);
 		if (ret) {
+			const char *gname;
+			const char *pname;
+
+			desc = pin_desc_get(pctldev, pins[i]);
+			pname = desc ? desc->name : "non-existing";
+			gname = pctlops->get_group_name(pctldev,
+						setting->data.mux.group);
 			dev_err(pctldev->dev,
-				"could not request pin %d on device %s\n",
-				pins[i], pinctrl_dev_get_name(pctldev));
+				"could not request pin %d (%s) from group %s "
+				" on device %s\n",
+				pins[i], pname, gname,
+				pinctrl_dev_get_name(pctldev));
 			goto err_pin_request;
 		}
 	}
@@ -430,15 +456,15 @@
 		desc->mux_setting = &(setting->data.mux);
 	}
 
-	ret = ops->enable(pctldev, setting->data.mux.func,
-			  setting->data.mux.group);
+	ret = ops->set_mux(pctldev, setting->data.mux.func,
+			   setting->data.mux.group);
 
 	if (ret)
-		goto err_enable;
+		goto err_set_mux;
 
 	return 0;
 
-err_enable:
+err_set_mux:
 	for (i = 0; i < num_pins; i++) {
 		desc = pin_desc_get(pctldev, pins[i]);
 		if (desc)
@@ -456,20 +482,24 @@
 {
 	struct pinctrl_dev *pctldev = setting->pctldev;
 	const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
-	const struct pinmux_ops *ops = pctldev->desc->pmxops;
-	int ret;
-	const unsigned *pins;
-	unsigned num_pins;
+	int ret = 0;
+	const unsigned *pins = NULL;
+	unsigned num_pins = 0;
 	int i;
 	struct pin_desc *desc;
 
-	ret = pctlops->get_group_pins(pctldev, setting->data.mux.group,
-				      &pins, &num_pins);
+	if (pctlops->get_group_pins)
+		ret = pctlops->get_group_pins(pctldev, setting->data.mux.group,
+					      &pins, &num_pins);
 	if (ret) {
+		const char *gname;
+
 		/* errors only affect debug data, so just warn */
+		gname = pctlops->get_group_name(pctldev,
+						setting->data.mux.group);
 		dev_warn(pctldev->dev,
-			 "could not get pins for group selector %d\n",
-			 setting->data.mux.group);
+			 "could not get pins for group %s\n",
+			 gname);
 		num_pins = 0;
 	}
 
@@ -482,15 +512,22 @@
 				 pins[i]);
 			continue;
 		}
-		desc->mux_setting = NULL;
-	}
-
-	/* And release the pins */
-	for (i = 0; i < num_pins; i++)
-		pin_free(pctldev, pins[i], NULL);
+		if (desc->mux_setting == &(setting->data.mux)) {
+			desc->mux_setting = NULL;
+			/* And release the pin */
+			pin_free(pctldev, pins[i], NULL);
+		} else {
+			const char *gname;
 
-	if (ops->disable)
-		ops->disable(pctldev, setting->data.mux.func, setting->data.mux.group);
+			gname = pctlops->get_group_name(pctldev,
+						setting->data.mux.group);
+			dev_warn(pctldev->dev,
+				 "not freeing pin %d (%s) as part of "
+				 "deactivating group %s - it is already "
+				 "used for some other setting",
+				 pins[i], desc->name, gname);
+		}
+	}
 }
 
 #ifdef CONFIG_DEBUG_FS
@@ -518,9 +555,12 @@
 
 		ret = pmxops->get_function_groups(pctldev, func_selector,
 						  &groups, &num_groups);
-		if (ret)
+		if (ret) {
 			seq_printf(s, "function %s: COULD NOT GET GROUPS\n",
 				   func);
+			func_selector++;
+			continue;
+		}
 
 		seq_printf(s, "function: %s, groups = [ ", func);
 		for (i = 0; i < num_groups; i++)
@@ -546,7 +586,12 @@
 		return 0;
 
 	seq_puts(s, "Pinmux settings per pin\n");
-	seq_puts(s, "Format: pin (name): mux_owner gpio_owner hog?\n");
+	if (pmxops->strict)
+		seq_puts(s,
+		 "Format: pin (name): mux_owner|gpio_owner (strict) hog?\n");
+	else
+		seq_puts(s,
+		"Format: pin (name): mux_owner gpio_owner hog?\n");
 
 	mutex_lock(&pctldev->mutex);
 
@@ -565,14 +610,34 @@
 		    !strcmp(desc->mux_owner, pinctrl_dev_get_name(pctldev)))
 			is_hog = true;
 
-		seq_printf(s, "pin %d (%s): %s %s%s", pin,
-			   desc->name ? desc->name : "unnamed",
-			   desc->mux_owner ? desc->mux_owner
-				: "(MUX UNCLAIMED)",
-			   desc->gpio_owner ? desc->gpio_owner
-				: "(GPIO UNCLAIMED)",
-			   is_hog ? " (HOG)" : "");
+		if (pmxops->strict) {
+			if (desc->mux_owner)
+				seq_printf(s, "pin %d (%s): device %s%s",
+					   pin,
+					   desc->name ? desc->name : "unnamed",
+					   desc->mux_owner,
+					   is_hog ? " (HOG)" : "");
+			else if (desc->gpio_owner)
+				seq_printf(s, "pin %d (%s): GPIO %s",
+					   pin,
+					   desc->name ? desc->name : "unnamed",
+					   desc->gpio_owner);
+			else
+				seq_printf(s, "pin %d (%s): UNCLAIMED",
+					   pin,
+					   desc->name ? desc->name : "unnamed");
+		} else {
+			/* For non-strict controllers */
+			seq_printf(s, "pin %d (%s): %s %s%s", pin,
+				   desc->name ? desc->name : "unnamed",
+				   desc->mux_owner ? desc->mux_owner
+				   : "(MUX UNCLAIMED)",
+				   desc->gpio_owner ? desc->gpio_owner
+				   : "(GPIO UNCLAIMED)",
+				   is_hog ? " (HOG)" : "");
+		}
 
+		/* If mux: print function+group claiming the pin */
 		if (desc->mux_setting)
 			seq_printf(s, " function %s group %s\n",
 				   pmxops->get_function_name(pctldev,