Merge tag 'devicetree-fixes-for-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux

Pull DeviceTree fixes from Rob Herring:

 - fix unflatten_dt_nodes when dad parameter is set.

 - add vendor prefixes for TechNexion and UniWest

 - documentation fix for Marvell BT

 - OF IRQ kerneldoc fixes

 - restrict CMA alignment adjustments to non dma-coherent

 - a couple of warning fixes in reserved-memory code

 - DT maintainers updates

* tag 'devicetree-fixes-for-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux:
  drivers: of: add definition of early_init_dt_alloc_reserved_memory_arch
  drivers/of: Fix depth for sub-tree blob in unflatten_dt_nodes()
  drivers: of: Fix of_pci.h header guard
  dt-bindings: Add vendor prefix for TechNexion
  of: add vendor prefix for UniWest
  dt: bindings: fix documentation for MARVELL's bt-sd8xxx wireless device
  of: add missing const for of_parse_phandle_with_args() in !CONFIG_OF
  of: silence warnings due to max() usage
  drivers: of: of_reserved_mem: fixup the CMA alignment not to affect dma-coherent
  of: irq: fix of_irq_get[_byname]() kernel-doc
  MAINTAINERS: DeviceTree maintainer updates

3 files changed, 32 insertions, 13 deletions

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 14f2f8c7c260..33daffc4392c 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -395,7 +395,7 @@ static int unflatten_dt_nodes(const void *blob,
 			      struct device_node **nodepp)
 {
 	struct device_node *root;
-	int offset = 0, depth = 0;
+	int offset = 0, depth = 0, initial_depth = 0;
 #define FDT_MAX_DEPTH	64
 	unsigned int fpsizes[FDT_MAX_DEPTH];
 	struct device_node *nps[FDT_MAX_DEPTH];
@@ -405,11 +405,22 @@ static int unflatten_dt_nodes(const void *blob,
 	if (nodepp)
 		*nodepp = NULL;
 
+	/*
+	 * We're unflattening device sub-tree if @dad is valid. There are
+	 * possibly multiple nodes in the first level of depth. We need
+	 * set @depth to 1 to make fdt_next_node() happy as it bails
+	 * immediately when negative @depth is found. Otherwise, the device
+	 * nodes except the first one won't be unflattened successfully.
+	 */
+	if (dad)
+		depth = initial_depth = 1;
+
 	root = dad;
 	fpsizes[depth] = dad ? strlen(of_node_full_name(dad)) : 0;
 	nps[depth] = dad;
+
 	for (offset = 0;
-	     offset >= 0 && depth >= 0;
+	     offset >= 0 && depth >= initial_depth;
 	     offset = fdt_next_node(blob, offset, &depth)) {
 		if (WARN_ON_ONCE(depth >= FDT_MAX_DEPTH))
 			continue;
diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index e7bfc175b8e1..6ec743faabe8 100644
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -386,13 +386,13 @@ int of_irq_to_resource(struct device_node *dev, int index, struct resource *r)
 EXPORT_SYMBOL_GPL(of_irq_to_resource);
 
 /**
- * of_irq_get - Decode a node's IRQ and return it as a Linux irq number
+ * of_irq_get - Decode a node's IRQ and return it as a Linux IRQ number
  * @dev: pointer to device tree node
- * @index: zero-based index of the irq
- *
- * Returns Linux irq number on success, or -EPROBE_DEFER if the irq domain
- * is not yet created.
+ * @index: zero-based index of the IRQ
  *
+ * Returns Linux IRQ number on success, or 0 on the IRQ mapping failure, or
+ * -EPROBE_DEFER if the IRQ domain is not yet created, or error code in case
+ * of any other failure.
  */
 int of_irq_get(struct device_node *dev, int index)
 {
@@ -413,12 +413,13 @@ int of_irq_get(struct device_node *dev, int index)
 EXPORT_SYMBOL_GPL(of_irq_get);
 
 /**
- * of_irq_get_byname - Decode a node's IRQ and return it as a Linux irq number
+ * of_irq_get_byname - Decode a node's IRQ and return it as a Linux IRQ number
  * @dev: pointer to device tree node
- * @name: irq name
+ * @name: IRQ name
  *
- * Returns Linux irq number on success, or -EPROBE_DEFER if the irq domain
- * is not yet created, or error code in case of any other failure.
+ * Returns Linux IRQ number on success, or 0 on the IRQ mapping failure, or
+ * -EPROBE_DEFER if the IRQ domain is not yet created, or error code in case
+ * of any other failure.
  */
 int of_irq_get_byname(struct device_node *dev, const char *name)
 {
diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
index ed01c0172e4a..216648233874 100644
--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c
@@ -127,8 +127,15 @@ static int __init __reserved_mem_alloc_size(unsigned long node,
 	}
 
 	/* Need adjust the alignment to satisfy the CMA requirement */
-	if (IS_ENABLED(CONFIG_CMA) && of_flat_dt_is_compatible(node, "shared-dma-pool"))
-		align = max(align, (phys_addr_t)PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order));
+	if (IS_ENABLED(CONFIG_CMA)
+	    && of_flat_dt_is_compatible(node, "shared-dma-pool")
+	    && of_get_flat_dt_prop(node, "reusable", NULL)
+	    && !of_get_flat_dt_prop(node, "no-map", NULL)) {
+		unsigned long order =
+			max_t(unsigned long, MAX_ORDER - 1, pageblock_order);
+
+		align = max(align, (phys_addr_t)PAGE_SIZE << order);
+	}
 
 	prop = of_get_flat_dt_prop(node, "alloc-ranges", &len);
 	if (prop) {