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![Patrice Chotard](/assets/img/avatar_default.png)
This function is usefull to get phandle number contained in a property list. For example, this allows to allocate the right amount of memory to keep clock's reference contained into the "clocks" property. To implement it, either of_count_phandle_with_args() or fdtdec_parse_phandle_with_args() are used respectively for live tree and flat tree. By passing index = -1, these 2 functions returns the number of phandle contained into the property list. Add also the dev_count_phandle_with_args() based on ofnode_count_phandle_with_args() Signed-off-by: Patrice Chotard <patrice.chotard@st.com> Reviewed-by: Simon Glass <sjg@chromium.org>
404 lines
14 KiB
C
404 lines
14 KiB
C
/*
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* Originally from Linux v4.9
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* Copyright (C) 1996-2005 Paul Mackerras.
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*
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* Updates for PPC64 by Peter Bergner & David Engebretsen, IBM Corp.
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* Updates for SPARC64 by David S. Miller
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* Derived from PowerPC and Sparc prom.h files by Stephen Rothwell, IBM Corp.
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*
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* Copyright (c) 2017 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*
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* Modified for U-Boot
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* Copyright (c) 2017 Google, Inc
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef _DM_OF_ACCESS_H
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#define _DM_OF_ACCESS_H
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#include <dm/of.h>
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/**
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* of_find_all_nodes - Get next node in global list
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* @prev: Previous node or NULL to start iteration
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* of_node_put() will be called on it
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*
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* Returns a node pointer with refcount incremented, use
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* of_node_put() on it when done.
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*/
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struct device_node *of_find_all_nodes(struct device_node *prev);
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#define for_each_of_allnodes_from(from, dn) \
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for (dn = of_find_all_nodes(from); dn; dn = of_find_all_nodes(dn))
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#define for_each_of_allnodes(dn) for_each_of_allnodes_from(NULL, dn)
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/* Dummy functions to mirror Linux. These are not used in U-Boot */
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#define of_node_get(x) (x)
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static inline void of_node_put(const struct device_node *np) { }
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/**
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* of_n_addr_cells() - Get the number of address cells for a node
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*
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* This walks back up the tree to find the closest #address-cells property
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* which controls the given node.
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*
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* @np: Node pointer to check
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* @return number of address cells this node uses
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*/
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int of_n_addr_cells(const struct device_node *np);
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/**
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* of_n_size_cells() - Get the number of size cells for a node
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*
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* This walks back up the tree to find the closest #size-cells property
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* which controls the given node.
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*
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* @np: Node pointer to check
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* @return number of size cells this node uses
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*/
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int of_n_size_cells(const struct device_node *np);
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/**
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* of_simple_addr_cells() - Get the address cells property in a node
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*
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* This function matches fdt_address_cells().
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*
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* @np: Node pointer to check
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* @return value of #address-cells property in this node, or 2 if none
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*/
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int of_simple_addr_cells(const struct device_node *np);
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/**
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* of_simple_size_cells() - Get the size cells property in a node
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*
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* This function matches fdt_size_cells().
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*
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* @np: Node pointer to check
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* @return value of #size-cells property in this node, or 2 if none
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*/
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int of_simple_size_cells(const struct device_node *np);
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/**
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* of_find_property() - find a property in a node
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*
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* @np: Pointer to device node holding property
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* @name: Name of property
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* @lenp: If non-NULL, returns length of property
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* @return pointer to property, or NULL if not found
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*/
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struct property *of_find_property(const struct device_node *np,
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const char *name, int *lenp);
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/**
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* of_get_property() - get a property value
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*
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* Find a property with a given name for a given node and return the value.
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*
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* @np: Pointer to device node holding property
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* @name: Name of property
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* @lenp: If non-NULL, returns length of property
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* @return pointer to property value, or NULL if not found
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*/
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const void *of_get_property(const struct device_node *np, const char *name,
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int *lenp);
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/**
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* of_device_is_compatible() - Check if the node matches given constraints
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* @device: pointer to node
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* @compat: required compatible string, NULL or "" for any match
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* @type: required device_type value, NULL or "" for any match
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* @name: required node name, NULL or "" for any match
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*
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* Checks if the given @compat, @type and @name strings match the
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* properties of the given @device. A constraints can be skipped by
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* passing NULL or an empty string as the constraint.
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*
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* @return 0 for no match, and a positive integer on match. The return
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* value is a relative score with larger values indicating better
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* matches. The score is weighted for the most specific compatible value
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* to get the highest score. Matching type is next, followed by matching
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* name. Practically speaking, this results in the following priority
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* order for matches:
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*
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* 1. specific compatible && type && name
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* 2. specific compatible && type
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* 3. specific compatible && name
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* 4. specific compatible
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* 5. general compatible && type && name
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* 6. general compatible && type
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* 7. general compatible && name
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* 8. general compatible
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* 9. type && name
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* 10. type
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* 11. name
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*/
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int of_device_is_compatible(const struct device_node *np, const char *compat,
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const char *type, const char *name);
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/**
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* of_device_is_available() - check if a device is available for use
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*
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* @device: Node to check for availability
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*
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* @return true if the status property is absent or set to "okay", false
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* otherwise
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*/
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bool of_device_is_available(const struct device_node *np);
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/**
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* of_get_parent() - Get a node's parent, if any
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*
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* @node: Node to check
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* @eturns a node pointer, or NULL if none
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*/
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struct device_node *of_get_parent(const struct device_node *np);
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/**
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* of_find_node_opts_by_path() - Find a node matching a full OF path
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*
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* @path: Either the full path to match, or if the path does not start with
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* '/', the name of a property of the /aliases node (an alias). In the
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* case of an alias, the node matching the alias' value will be returned.
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* @opts: Address of a pointer into which to store the start of an options
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* string appended to the end of the path with a ':' separator. Can be NULL
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*
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* Valid paths:
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* /foo/bar Full path
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* foo Valid alias
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* foo/bar Valid alias + relative path
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*
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* @return a node pointer or NULL if not found
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*/
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struct device_node *of_find_node_opts_by_path(const char *path,
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const char **opts);
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static inline struct device_node *of_find_node_by_path(const char *path)
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{
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return of_find_node_opts_by_path(path, NULL);
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}
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/**
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* of_find_compatible_node() - find a node based on its compatible string
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*
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* Find a node based on type and one of the tokens in its "compatible" property
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* @from: Node to start searching from or NULL. the node you pass will not be
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* searched, only the next one will; typically, you pass what the previous
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* call returned.
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* @type: The type string to match "device_type" or NULL to ignore
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* @compatible: The string to match to one of the tokens in the device
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* "compatible" list.
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* @return node pointer or NULL if not found
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*/
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struct device_node *of_find_compatible_node(struct device_node *from,
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const char *type, const char *compatible);
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/**
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* of_find_node_by_phandle() - Find a node given a phandle
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*
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* @handle: phandle of the node to find
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*
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* @return node pointer, or NULL if not found
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*/
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struct device_node *of_find_node_by_phandle(phandle handle);
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/**
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* of_read_u32() - Find and read a 32-bit integer from a property
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*
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* Search for a property in a device node and read a 32-bit value from
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* it.
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*
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* @np: device node from which the property value is to be read.
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* @propname: name of the property to be searched.
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* @outp: pointer to return value, modified only if return value is 0.
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*
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* @return 0 on success, -EINVAL if the property does not exist,
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* -ENODATA if property does not have a value, and -EOVERFLOW if the
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* property data isn't large enough.
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*/
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int of_read_u32(const struct device_node *np, const char *propname, u32 *outp);
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/**
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* of_read_u32_array() - Find and read an array of 32 bit integers
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*
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* Search for a property in a device node and read 32-bit value(s) from
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* it.
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*
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* @np: device node from which the property value is to be read.
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* @propname: name of the property to be searched.
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* @out_values: pointer to return value, modified only if return value is 0.
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* @sz: number of array elements to read
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* @return 0 on success, -EINVAL if the property does not exist, -ENODATA
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* if property does not have a value, and -EOVERFLOW is longer than sz.
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*/
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int of_read_u32_array(const struct device_node *np, const char *propname,
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u32 *out_values, size_t sz);
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/**
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* of_property_match_string() - Find string in a list and return index
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*
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* This function searches a string list property and returns the index
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* of a specific string value.
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*
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* @np: pointer to node containing string list property
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* @propname: string list property name
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* @string: pointer to string to search for in string list
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* @return 0 on success, -EINVAL if the property does not exist, -ENODATA
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* if property does not have a value, and -EOVERFLOW is longer than sz.
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*/
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int of_property_match_string(const struct device_node *np, const char *propname,
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const char *string);
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int of_property_read_string_helper(const struct device_node *np,
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const char *propname, const char **out_strs,
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size_t sz, int index);
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/**
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* of_property_read_string_index() - Find and read a string from a multiple
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* strings property.
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* @np: device node from which the property value is to be read.
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* @propname: name of the property to be searched.
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* @index: index of the string in the list of strings
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* @out_string: pointer to null terminated return string, modified only if
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* return value is 0.
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*
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* Search for a property in a device tree node and retrieve a null
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* terminated string value (pointer to data, not a copy) in the list of strings
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* contained in that property.
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* Returns 0 on success, -EINVAL if the property does not exist, -ENODATA if
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* property does not have a value, and -EILSEQ if the string is not
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* null-terminated within the length of the property data.
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*
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* The out_string pointer is modified only if a valid string can be decoded.
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*/
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static inline int of_property_read_string_index(const struct device_node *np,
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const char *propname,
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int index, const char **output)
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{
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int rc = of_property_read_string_helper(np, propname, output, 1, index);
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return rc < 0 ? rc : 0;
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}
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/**
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* of_property_count_strings() - Find and return the number of strings from a
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* multiple strings property.
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* @np: device node from which the property value is to be read.
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* @propname: name of the property to be searched.
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*
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* Search for a property in a device tree node and retrieve the number of null
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* terminated string contain in it. Returns the number of strings on
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* success, -EINVAL if the property does not exist, -ENODATA if property
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* does not have a value, and -EILSEQ if the string is not null-terminated
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* within the length of the property data.
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*/
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static inline int of_property_count_strings(const struct device_node *np,
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const char *propname)
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{
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return of_property_read_string_helper(np, propname, NULL, 0, 0);
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}
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/**
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* of_parse_phandle - Resolve a phandle property to a device_node pointer
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* @np: Pointer to device node holding phandle property
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* @phandle_name: Name of property holding a phandle value
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* @index: For properties holding a table of phandles, this is the index into
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* the table
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*
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* Returns the device_node pointer with refcount incremented. Use
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* of_node_put() on it when done.
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*/
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struct device_node *of_parse_phandle(const struct device_node *np,
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const char *phandle_name, int index);
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/**
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* of_parse_phandle_with_args() - Find a node pointed by phandle in a list
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*
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* @np: pointer to a device tree node containing a list
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* @list_name: property name that contains a list
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* @cells_name: property name that specifies phandles' arguments count
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* @index: index of a phandle to parse out
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* @out_args: optional pointer to output arguments structure (will be filled)
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* @return 0 on success (with @out_args filled out if not NULL), -ENOENT if
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* @list_name does not exist, -EINVAL if a phandle was not found,
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* @cells_name could not be found, the arguments were truncated or there
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* were too many arguments.
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*
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* This function is useful to parse lists of phandles and their arguments.
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* Returns 0 on success and fills out_args, on error returns appropriate
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* errno value.
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*
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* Caller is responsible to call of_node_put() on the returned out_args->np
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* pointer.
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*
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* Example:
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*
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* phandle1: node1 {
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* #list-cells = <2>;
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* }
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*
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* phandle2: node2 {
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* #list-cells = <1>;
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* }
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*
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* node3 {
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* list = <&phandle1 1 2 &phandle2 3>;
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* }
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*
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* To get a device_node of the `node2' node you may call this:
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* of_parse_phandle_with_args(node3, "list", "#list-cells", 1, &args);
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*/
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int of_parse_phandle_with_args(const struct device_node *np,
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const char *list_name, const char *cells_name,
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int index, struct of_phandle_args *out_args);
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/**
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* of_count_phandle_with_args() - Count the number of phandle in a list
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*
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* @np: pointer to a device tree node containing a list
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* @list_name: property name that contains a list
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* @cells_name: property name that specifies phandles' arguments count
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* @return number of phandle found, -ENOENT if
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* @list_name does not exist, -EINVAL if a phandle was not found,
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* @cells_name could not be found, the arguments were truncated or there
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* were too many arguments.
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*
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* Returns number of phandle found on success, on error returns appropriate
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* errno value.
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*
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*/
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int of_count_phandle_with_args(const struct device_node *np,
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const char *list_name, const char *cells_name);
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/**
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* of_alias_scan() - Scan all properties of the 'aliases' node
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*
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* The function scans all the properties of the 'aliases' node and populates
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* the lookup table with the properties. It returns the number of alias
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* properties found, or an error code in case of failure.
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*
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* @return 9 if OK, -ENOMEM if not enough memory
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*/
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int of_alias_scan(void);
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/**
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* of_alias_get_id - Get alias id for the given device_node
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*
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* Travels the lookup table to get the alias id for the given device_node and
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* alias stem.
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*
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* @np: Pointer to the given device_node
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* @stem: Alias stem of the given device_node
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* @return alias ID, if found, else -ENODEV
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*/
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int of_alias_get_id(const struct device_node *np, const char *stem);
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/**
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* of_get_stdout() - Get node to use for stdout
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*
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* @return node referred to by stdout-path alias, or NULL if none
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*/
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struct device_node *of_get_stdout(void);
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#endif
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