Merge tag 'devprop-5.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull device properties framework updates from Rafael Wysocki:
 "Add support for printing fwnode names using a new conversion specifier
  "%pfw" (Sakari Ailus), clean up the software node and
  efi/apple-properties code in preparation for improved software node
  reference properties handling (Dmitry Torokhov) and fix the struct
  fwnode_operations description (Heikki Krogerus)"

* tag 'devprop-5.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (22 commits)
  software node: simplify property_entry_read_string_array()
  software node: unify PROPERTY_ENTRY_XXX macros
  software node: remove property_entry_read_uNN_array functions
  software node: get rid of property_set_pointer()
  software node: clean up property_copy_string_array()
  software node: mark internal macros with double underscores
  efi/apple-properties: use PROPERTY_ENTRY_U8_ARRAY_LEN
  software node: introduce PROPERTY_ENTRY_XXX_ARRAY_LEN()
  software node: remove DEV_PROP_MAX
  device property: Fix the description of struct fwnode_operations
  lib/test_printf: Add tests for %pfw printk modifier
  lib/vsprintf: Add %pfw conversion specifier for printing fwnode names
  lib/vsprintf: OF nodes are first and foremost, struct device_nodes
  lib/vsprintf: Make use of fwnode API to obtain node names and separators
  lib/vsprintf: Add a note on re-using %pf or %pF
  lib/vsprintf: Remove support for %pF and %pf in favour of %pS and %ps
  device property: Add a function to obtain a node's prefix
  device property: Add fwnode_get_name for returning the name of a node
  device property: Add functions for accessing node's parents
  device property: Move fwnode_get_parent() up
  ...

2 files changed, 88 insertions, 37 deletions

diff --git a/lib/test_printf.c b/lib/test_printf.c
index 030daeb4fe21..2d9f520d2f27 100644
--- a/lib/test_printf.c
+++ b/lib/test_printf.c
@@ -22,6 +22,8 @@
 #include <linux/gfp.h>
 #include <linux/mm.h>
 
+#include <linux/property.h>
+
 #include "../tools/testing/selftests/kselftest_module.h"
 
 #define BUF_SIZE 256
@@ -593,6 +595,35 @@ flags(void)
 	kfree(cmp_buffer);
 }
 
+static void __init fwnode_pointer(void)
+{
+	const struct software_node softnodes[] = {
+		{ .name = "first", },
+		{ .name = "second", .parent = &softnodes[0], },
+		{ .name = "third", .parent = &softnodes[1], },
+		{ NULL /* Guardian */ }
+	};
+	const char * const full_name = "first/second/third";
+	const char * const full_name_second = "first/second";
+	const char * const second_name = "second";
+	const char * const third_name = "third";
+	int rval;
+
+	rval = software_node_register_nodes(softnodes);
+	if (rval) {
+		pr_warn("cannot register softnodes; rval %d\n", rval);
+		return;
+	}
+
+	test(full_name_second, "%pfw", software_node_fwnode(&softnodes[1]));
+	test(full_name, "%pfw", software_node_fwnode(&softnodes[2]));
+	test(full_name, "%pfwf", software_node_fwnode(&softnodes[2]));
+	test(second_name, "%pfwP", software_node_fwnode(&softnodes[1]));
+	test(third_name, "%pfwP", software_node_fwnode(&softnodes[2]));
+
+	software_node_unregister_nodes(softnodes);
+}
+
 static void __init
 errptr(void)
 {
@@ -636,6 +667,7 @@ test_pointer(void)
 	netdev_features();
 	flags();
 	errptr();
+	fwnode_pointer();
 }
 
 static void __init selftest(void)
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index b54d252b398e..dee8fc467fcf 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -39,6 +39,7 @@
 #include <net/addrconf.h>
 #include <linux/siphash.h>
 #include <linux/compiler.h>
+#include <linux/property.h>
 #ifdef CONFIG_BLOCK
 #include <linux/blkdev.h>
 #endif
@@ -938,7 +939,7 @@ char *symbol_string(char *buf, char *end, void *ptr,
 #ifdef CONFIG_KALLSYMS
 	if (*fmt == 'B')
 		sprint_backtrace(sym, value);
-	else if (*fmt != 'f' && *fmt != 's')
+	else if (*fmt != 's')
 		sprint_symbol(sym, value);
 	else
 		sprint_symbol_no_offset(sym, value);
@@ -1892,32 +1893,25 @@ char *flags_string(char *buf, char *end, void *flags_ptr,
 	return format_flags(buf, end, flags, names);
 }
 
-static const char *device_node_name_for_depth(const struct device_node *np, int depth)
-{
-	for ( ; np && depth; depth--)
-		np = np->parent;
-
-	return kbasename(np->full_name);
-}
-
 static noinline_for_stack
-char *device_node_gen_full_name(const struct device_node *np, char *buf, char *end)
+char *fwnode_full_name_string(struct fwnode_handle *fwnode, char *buf,
+			      char *end)
 {
 	int depth;
-	const struct device_node *parent = np->parent;
-
-	/* special case for root node */
-	if (!parent)
-		return string_nocheck(buf, end, "/", default_str_spec);
 
-	for (depth = 0; parent->parent; depth++)
-		parent = parent->parent;
+	/* Loop starting from the root node to the current node. */
+	for (depth = fwnode_count_parents(fwnode); depth >= 0; depth--) {
+		struct fwnode_handle *__fwnode =
+			fwnode_get_nth_parent(fwnode, depth);
 
-	for ( ; depth >= 0; depth--) {
-		buf = string_nocheck(buf, end, "/", default_str_spec);
-		buf = string(buf, end, device_node_name_for_depth(np, depth),
+		buf = string(buf, end, fwnode_get_name_prefix(__fwnode),
 			     default_str_spec);
+		buf = string(buf, end, fwnode_get_name(__fwnode),
+			     default_str_spec);
+
+		fwnode_handle_put(__fwnode);
 	}
+
 	return buf;
 }
 
@@ -1941,6 +1935,9 @@ char *device_node_string(char *buf, char *end, struct device_node *dn,
 	struct printf_spec str_spec = spec;
 	str_spec.field_width = -1;
 
+	if (fmt[0] != 'F')
+		return error_string(buf, end, "(%pO?)", spec);
+
 	if (!IS_ENABLED(CONFIG_OF))
 		return error_string(buf, end, "(%pOF?)", spec);
 
@@ -1962,10 +1959,11 @@ char *device_node_string(char *buf, char *end, struct device_node *dn,
 
 		switch (*fmt) {
 		case 'f':	/* full_name */
-			buf = device_node_gen_full_name(dn, buf, end);
+			buf = fwnode_full_name_string(of_fwnode_handle(dn), buf,
+						      end);
 			break;
 		case 'n':	/* name */
-			p = kbasename(of_node_full_name(dn));
+			p = fwnode_get_name(of_fwnode_handle(dn));
 			precision = str_spec.precision;
 			str_spec.precision = strchrnul(p, '@') - p;
 			buf = string(buf, end, p, str_spec);
@@ -1975,7 +1973,7 @@ char *device_node_string(char *buf, char *end, struct device_node *dn,
 			buf = number(buf, end, (unsigned int)dn->phandle, num_spec);
 			break;
 		case 'P':	/* path-spec */
-			p = kbasename(of_node_full_name(dn));
+			p = fwnode_get_name(of_fwnode_handle(dn));
 			if (!p[1])
 				p = "/";
 			buf = string(buf, end, p, str_spec);
@@ -2013,15 +2011,34 @@ char *device_node_string(char *buf, char *end, struct device_node *dn,
 	return widen_string(buf, buf - buf_start, end, spec);
 }
 
-static char *kobject_string(char *buf, char *end, void *ptr,
-			    struct printf_spec spec, const char *fmt)
+static noinline_for_stack
+char *fwnode_string(char *buf, char *end, struct fwnode_handle *fwnode,
+		    struct printf_spec spec, const char *fmt)
 {
-	switch (fmt[1]) {
-	case 'F':
-		return device_node_string(buf, end, ptr, spec, fmt + 1);
+	struct printf_spec str_spec = spec;
+	char *buf_start = buf;
+
+	str_spec.field_width = -1;
+
+	if (*fmt != 'w')
+		return error_string(buf, end, "(%pf?)", spec);
+
+	if (check_pointer(&buf, end, fwnode, spec))
+		return buf;
+
+	fmt++;
+
+	switch (*fmt) {
+	case 'P':	/* name */
+		buf = string(buf, end, fwnode_get_name(fwnode), str_spec);
+		break;
+	case 'f':	/* full_name */
+	default:
+		buf = fwnode_full_name_string(fwnode, buf, end);
+		break;
 	}
 
-	return error_string(buf, end, "(%pO?)", spec);
+	return widen_string(buf, buf - buf_start, end, spec);
 }
 
 /*
@@ -2036,9 +2053,9 @@ static char *kobject_string(char *buf, char *end, void *ptr,
  *
  * - 'S' For symbolic direct pointers (or function descriptors) with offset
  * - 's' For symbolic direct pointers (or function descriptors) without offset
- * - 'F' Same as 'S'
- * - 'f' Same as 's'
- * - '[FfSs]R' as above with __builtin_extract_return_addr() translation
+ * - '[Ss]R' as above with __builtin_extract_return_addr() translation
+ * - '[Ff]' %pf and %pF were obsoleted and later removed in favor of
+ *	    %ps and %pS. Be careful when re-using these specifiers.
  * - 'B' For backtraced symbolic direct pointers with offset
  * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
  * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
@@ -2128,6 +2145,10 @@ static char *kobject_string(char *buf, char *end, void *ptr,
  *                  F device node flags
  *                  c major compatible string
  *                  C full compatible string
+ * - 'fw[fP]'	For a firmware node (struct fwnode_handle) pointer
+ *		Without an option prints the full name of the node
+ *		f full name
+ *		P node name, including a possible unit address
  * - 'x' For printing the address. Equivalent to "%lx".
  *
  * ** When making changes please also update:
@@ -2141,8 +2162,6 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 	      struct printf_spec spec)
 {
 	switch (*fmt) {
-	case 'F':
-	case 'f':
 	case 'S':
 	case 's':
 		ptr = dereference_symbol_descriptor(ptr);
@@ -2204,7 +2223,9 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 	case 'G':
 		return flags_string(buf, end, ptr, spec, fmt);
 	case 'O':
-		return kobject_string(buf, end, ptr, spec, fmt);
+		return device_node_string(buf, end, ptr, spec, fmt + 1);
+	case 'f':
+		return fwnode_string(buf, end, ptr, spec, fmt + 1);
 	case 'x':
 		return pointer_string(buf, end, ptr, spec);
 	case 'e':
@@ -2844,8 +2865,6 @@ int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
 			/* Dereference of functions is still OK */
 			case 'S':
 			case 's':
-			case 'F':
-			case 'f':
 			case 'x':
 			case 'K':
 			case 'e':