From 52157f13ef3d45984ab17fd79bf0d9c69b57ae66 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Tue, 12 Sep 2023 12:27:13 -0600 Subject: pylibfdt: Support boolean properties Boolean properties are unusual in that their presense or absence indicates the value of the property. This makes them a little painful to support using the existing getprop() support. Add new methods to deal with booleans specifically. Signed-off-by: Simon Glass Message-ID: <20230912182716.248253-1-sjg@chromium.org> Signed-off-by: David Gibson --- pylibfdt/libfdt.i | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) (limited to 'pylibfdt') diff --git a/pylibfdt/libfdt.i b/pylibfdt/libfdt.i index 2361e22..0b50983 100644 --- a/pylibfdt/libfdt.i +++ b/pylibfdt/libfdt.i @@ -419,6 +419,35 @@ class FdtRo(object): return pdata return Property(prop_name, bytearray(pdata[0])) + def hasprop(self, nodeoffset, prop_name, quiet=()): + """Check if a node has a property + + This can be used to check boolean properties + + Args: + nodeoffset: Node offset containing property to check + prop_name: Name of property to check + quiet: Errors to ignore (empty to raise on all errors). Note that + NOTFOUND is added internally by this function so need not be + provided + + Returns: + True if the property exists in the node, else False. If an error + other than -NOTFOUND is returned by fdt_getprop() then the error + is return (-ve integer) + + Raises: + FdtError if any error occurs other than NOTFOUND (e.g. the + nodeoffset is invalid) + """ + pdata = check_err_null(fdt_getprop(self._fdt, nodeoffset, prop_name), + quiet + (NOTFOUND,)) + if isinstance(pdata, (int)): + if pdata == -NOTFOUND: + return False + return pdata + return True + def get_phandle(self, nodeoffset): """Get the phandle of a node @@ -605,6 +634,32 @@ class Fdt(FdtRo): return check_err(fdt_setprop(self._fdt, nodeoffset, prop_name, val, len(val)), quiet) + def setprop_bool(self, nodeoffset, prop_name, val, quiet=()): + """Set the boolean value of a property + + Either: + adds the property if not already present; or + deletes the property if present + + Args: + nodeoffset: Node offset containing the property to create/delete + prop_name: Name of property + val: Boolean value to write (i.e. True or False) + quiet: Errors to ignore (empty to raise on all errors) + + Returns: + Error code, or 0 if OK + + Raises: + FdtException if no parent found or other error occurs + """ + exists = self.hasprop(nodeoffset, prop_name, quiet) + if val != exists: + if val: + return self.setprop(nodeoffset, prop_name, b'', quiet=quiet) + else: + return self.delprop(nodeoffset, prop_name, quiet=quiet) + def setprop_u32(self, nodeoffset, prop_name, val, quiet=()): """Set the value of a property -- cgit v1.1