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// SPDX-License-Identifier: LGPL-2.1-or-later
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Support ePAPR compliant phandle properties
Currently, the Linux kernel, libfdt and dtc, when using flattened
device trees encode a node's phandle into a property named
"linux,phandle". The ePAPR specification, however - aiming as it is
to not be a Linux specific spec - requires that phandles be encoded in
a property named simply "phandle".
This patch adds support for this newer approach to dtc and libfdt.
Specifically:
- fdt_get_phandle() will now return the correct phandle if it
is supplied in either of these properties
- fdt_node_offset_by_phandle() will correctly find a node with
the given phandle encoded in either property.
- By default, when auto-generating phandles, dtc will encode
it into both properties for maximum compatibility. A new -H
option allows either only old-style or only new-style
properties to be generated.
- If phandle properties are explicitly supplied in the dts
file, dtc will not auto-generate ones in the alternate format.
- If both properties are supplied, dtc will check that they
have the same value.
- Some existing testcases are updated to use a mix of old and
new-style phandles, partially testing the changes.
- A new phandle_format test further tests the libfdt support,
and the -H option.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
15 years ago
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/*
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* libfdt - Flat Device Tree manipulation
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* Testcase for phandle format options
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* Copyright (C) 2009 David Gibson, IBM Corporation.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdint.h>
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#include <libfdt.h>
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#include "tests.h"
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#include "testdata.h"
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#define PHANDLE_LEGACY 0x1
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#define PHANDLE_EPAPR 0x2
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#define PHANDLE_BOTH 0x3
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int main(int argc, char *argv[])
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{
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void *fdt;
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int phandle_format;
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int n4;
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uint32_t h4;
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if (argc != 3)
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CONFIG("Usage: %s <dtb file> <legacy|epapr|both>\n", argv[0]);
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test_init(argc, argv);
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fdt = load_blob(argv[1]);
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if (streq(argv[2], "legacy"))
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phandle_format = PHANDLE_LEGACY;
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else if (streq(argv[2], "epapr"))
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phandle_format = PHANDLE_EPAPR;
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else if (streq(argv[2], "both"))
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phandle_format = PHANDLE_BOTH;
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else
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CONFIG("Usage: %s <dtb file> <legacy|epapr|both>\n", argv[0]);
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n4 = fdt_path_offset(fdt, "/node4");
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if (n4 < 0)
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FAIL("fdt_path_offset(/node4): %s", fdt_strerror(n4));
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h4 = fdt_get_phandle(fdt, n4);
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if ((h4 == 0) || (h4 == -1))
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FAIL("/node4 has bad phandle 0x%x\n", h4);
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if (phandle_format & PHANDLE_LEGACY)
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check_getprop_cell(fdt, n4, "linux,phandle", h4);
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else
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if (fdt_getprop(fdt, n4, "linux,phandle", NULL))
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FAIL("linux,phandle property present in non-legacy mode");
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if (phandle_format & PHANDLE_EPAPR)
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check_getprop_cell(fdt, n4, "phandle", h4);
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else
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if (fdt_getprop(fdt, n4, "phandle", NULL))
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FAIL("phandle property present in legacy-only mode");
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PASS();
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}
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