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Commit c4263233 authored by Gavin Shan's avatar Gavin Shan Committed by Rob Herring
Browse files

drivers/of: Specify parent node in of_fdt_unflatten_tree() 



This adds one more argument to of_fdt_unflatten_tree() to specify
the parent node of the FDT blob that is going to be unflattened.
In the result, the function can be used to unflatten FDT blob that
represents device sub-tree in PowerNV PCI hotplug driver.

Cc: Jyri Sarha <jsarha@ti.com>
Signed-off-by: default avatarGavin Shan <gwshan@linux.vnet.ibm.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Acked-by: default avatarJyri Sarha <jsarha@ti.com>
Signed-off-by: default avatarRob Herring <robh@kernel.org>
parent 947c82cb

drivers/gpu/drm/tilcdc/tilcdc_slave_compat.c

+1 −1
Original line number Diff line number Diff line
@@ -157,7 +157,7 @@ struct device_node * __init tilcdc_get_overlay(struct kfree_table *kft) 
	if (!overlay_data || kfree_table_add(kft, overlay_data))

		return NULL;



	of_fdt_unflatten_tree(overlay_data, &overlay);

	of_fdt_unflatten_tree(overlay_data, NULL, &overlay);

	if (!overlay) {

		pr_warn("%s: Unfattening overlay tree failed\n", __func__);

		return NULL;

drivers/of/fdt.c

+10 −4
Original line number Diff line number Diff line
@@ -450,11 +450,13 @@ static int unflatten_dt_nodes(const void *blob, 
 * pointers of the nodes so the normal device-tree walking functions

 * can be used.

 * @blob: The blob to expand

 * @dad: Parent device node

 * @mynodes: The device_node tree created by the call

 * @dt_alloc: An allocator that provides a virtual address to memory

 * for the resulting tree

 */

static void __unflatten_device_tree(const void *blob,

			     struct device_node *dad,

			     struct device_node **mynodes,

			     void * (*dt_alloc)(u64 size, u64 align))

{
@@ -479,7 +481,7 @@ static void __unflatten_device_tree(const void *blob, 
	}



	/* First pass, scan for size */

	size = unflatten_dt_nodes(blob, NULL, NULL, NULL);

	size = unflatten_dt_nodes(blob, NULL, dad, NULL);

	if (size < 0)

		return;
@@ -495,7 +497,7 @@ static void __unflatten_device_tree(const void *blob, 
	pr_debug("  unflattening %p...\n", mem);



	/* Second pass, do actual unflattening */

	unflatten_dt_nodes(blob, mem, NULL, mynodes);

	unflatten_dt_nodes(blob, mem, dad, mynodes);

	if (be32_to_cpup(mem + size) != 0xdeadbeef)

		pr_warning("End of tree marker overwritten: %08x\n",

			   be32_to_cpup(mem + size));
@@ -512,6 +514,9 @@ static DEFINE_MUTEX(of_fdt_unflatten_mutex); 


/**

 * of_fdt_unflatten_tree - create tree of device_nodes from flat blob

 * @blob: Flat device tree blob

 * @dad: Parent device node

 * @mynodes: The device tree created by the call

 *

 * unflattens the device-tree passed by the firmware, creating the

 * tree of struct device_node. It also fills the "name" and "type"
@@ -519,10 +524,11 @@ static DEFINE_MUTEX(of_fdt_unflatten_mutex); 
 * can be used.

 */

void of_fdt_unflatten_tree(const unsigned long *blob,

			struct device_node *dad,

			struct device_node **mynodes)

{

	mutex_lock(&of_fdt_unflatten_mutex);

	__unflatten_device_tree(blob, mynodes, &kernel_tree_alloc);

	__unflatten_device_tree(blob, dad, mynodes, &kernel_tree_alloc);

	mutex_unlock(&of_fdt_unflatten_mutex);

}

EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree);
@@ -1195,7 +1201,7 @@ bool __init early_init_dt_scan(void *params) 
 */

void __init unflatten_device_tree(void)

{

	__unflatten_device_tree(initial_boot_params, &of_root,

	__unflatten_device_tree(initial_boot_params, NULL, &of_root,

				early_init_dt_alloc_memory_arch);



	/* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */

drivers/of/unittest.c

+1 −1
Original line number Diff line number Diff line
@@ -921,7 +921,7 @@ static int __init unittest_data_add(void) 
			"not running tests\n", __func__);

		return -ENOMEM;

	}

	of_fdt_unflatten_tree(unittest_data, &unittest_data_node);

	of_fdt_unflatten_tree(unittest_data, NULL, &unittest_data_node);

	if (!unittest_data_node) {

		pr_warn("%s: No tree to attach; not running tests\n", __func__);

		return -ENODATA;

include/linux/of_fdt.h

+1 −0
Original line number Diff line number Diff line
@@ -38,6 +38,7 @@ extern bool of_fdt_is_big_endian(const void *blob, 
extern int of_fdt_match(const void *blob, unsigned long node,

			const char *const *compat);

extern void of_fdt_unflatten_tree(const unsigned long *blob,

			       struct device_node *dad,

			       struct device_node **mynodes);



/* TBD: Temporary export of fdt globals - remove when code fully merged */