Linux-libre 4.2-gnu

1 files changed, 48 insertions, 11 deletions

diff --git a/drivers/pinctrl/freescale/pinctrl-imx.c b/drivers/pinctrl/freescale/pinctrl-imx.c
index e261f1cf8..d7b98ba36 100644
--- a/drivers/pinctrl/freescale/pinctrl-imx.c
+++ b/drivers/pinctrl/freescale/pinctrl-imx.c
@@ -606,6 +606,29 @@ static int imx_pinctrl_parse_functions(struct device_node *np,
 	return 0;
 }
 
+/*
+ * Check if the DT contains pins in the direct child nodes. This indicates the
+ * newer DT format to store pins. This function returns true if the first found
+ * fsl,pins property is in a child of np. Otherwise false is returned.
+ */
+static bool imx_pinctrl_dt_is_flat_functions(struct device_node *np)
+{
+	struct device_node *function_np;
+	struct device_node *pinctrl_np;
+
+	for_each_child_of_node(np, function_np) {
+		if (of_property_read_bool(function_np, "fsl,pins"))
+			return true;
+
+		for_each_child_of_node(function_np, pinctrl_np) {
+			if (of_property_read_bool(pinctrl_np, "fsl,pins"))
+				return false;
+		}
+	}
+
+	return true;
+}
+
 static int imx_pinctrl_probe_dt(struct platform_device *pdev,
 				struct imx_pinctrl_soc_info *info)
 {
@@ -613,14 +636,20 @@ static int imx_pinctrl_probe_dt(struct platform_device *pdev,
 	struct device_node *child;
 	u32 nfuncs = 0;
 	u32 i = 0;
+	bool flat_funcs;
 
 	if (!np)
 		return -ENODEV;
 
-	nfuncs = of_get_child_count(np);
-	if (nfuncs <= 0) {
-		dev_err(&pdev->dev, "no functions defined\n");
-		return -EINVAL;
+	flat_funcs = imx_pinctrl_dt_is_flat_functions(np);
+	if (flat_funcs) {
+		nfuncs = 1;
+	} else {
+		nfuncs = of_get_child_count(np);
+		if (nfuncs <= 0) {
+			dev_err(&pdev->dev, "no functions defined\n");
+			return -EINVAL;
+		}
 	}
 
 	info->nfunctions = nfuncs;
@@ -629,16 +658,24 @@ static int imx_pinctrl_probe_dt(struct platform_device *pdev,
 	if (!info->functions)
 		return -ENOMEM;
 
-	info->ngroups = 0;
-	for_each_child_of_node(np, child)
-		info->ngroups += of_get_child_count(child);
+	if (flat_funcs) {
+		info->ngroups = of_get_child_count(np);
+	} else {
+		info->ngroups = 0;
+		for_each_child_of_node(np, child)
+			info->ngroups += of_get_child_count(child);
+	}
 	info->groups = devm_kzalloc(&pdev->dev, info->ngroups * sizeof(struct imx_pin_group),
 					GFP_KERNEL);
 	if (!info->groups)
 		return -ENOMEM;
 
-	for_each_child_of_node(np, child)
-		imx_pinctrl_parse_functions(child, info, i++);
+	if (flat_funcs) {
+		imx_pinctrl_parse_functions(np, info, 0);
+	} else {
+		for_each_child_of_node(np, child)
+			imx_pinctrl_parse_functions(child, info, i++);
+	}
 
 	return 0;
 }
@@ -690,9 +727,9 @@ int imx_pinctrl_probe(struct platform_device *pdev,
 	ipctl->dev = info->dev;
 	platform_set_drvdata(pdev, ipctl);
 	ipctl->pctl = pinctrl_register(&imx_pinctrl_desc, &pdev->dev, ipctl);
-	if (!ipctl->pctl) {
+	if (IS_ERR(ipctl->pctl)) {
 		dev_err(&pdev->dev, "could not register IMX pinctrl driver\n");
-		return -EINVAL;
+		return PTR_ERR(ipctl->pctl);
 	}
 
 	dev_info(&pdev->dev, "initialized IMX pinctrl driver\n");