59 lines
2.4 KiB
Diff
59 lines
2.4 KiB
Diff
From c5d264d4b527c96ae8903376a4b195df47b05203 Mon Sep 17 00:00:00 2001
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From: Michael Walle <michael@walle.cc>
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Date: Mon, 6 Feb 2023 13:43:43 +0000
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Subject: [PATCH] of: base: add of_parse_phandle_with_optional_args()
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Add a new variant of the of_parse_phandle_with_args() which treats the
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cells name as optional. If it's missing, it is assumed that the phandle
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has no arguments.
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Up until now, a nvmem node didn't have any arguments, so all the device
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trees haven't any '#*-cells' property. But there is a need for an
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additional argument for the phandle, for which we need a '#*-cells'
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property. Therefore, we need to support nvmem nodes with and without
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this property.
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Signed-off-by: Michael Walle <michael@walle.cc>
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Reviewed-by: Rob Herring <robh@kernel.org>
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Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
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Link: https://lore.kernel.org/r/20230206134356.839737-10-srinivas.kandagatla@linaro.org
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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include/linux/of.h | 25 +++++++++++++++++++++++++
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1 file changed, 25 insertions(+)
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--- a/include/linux/of.h
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+++ b/include/linux/of.h
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@@ -1019,6 +1019,31 @@ static inline int of_parse_phandle_with_
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}
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/**
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+ * of_parse_phandle_with_optional_args() - Find a node pointed by phandle in a list
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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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+ *
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+ * Same as of_parse_phandle_with_args() except that if the cells_name property
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+ * is not found, cell_count of 0 is assumed.
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+ *
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+ * This is used to useful, if you have a phandle which didn't have arguments
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+ * before and thus doesn't have a '#*-cells' property but is now migrated to
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+ * having arguments while retaining backwards compatibility.
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+ */
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+static inline int of_parse_phandle_with_optional_args(const struct device_node *np,
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+ const char *list_name,
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+ const char *cells_name,
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+ int index,
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+ struct of_phandle_args *out_args)
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+{
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+ return __of_parse_phandle_with_args(np, list_name, cells_name,
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+ 0, index, out_args);
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+}
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+
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+/**
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* of_property_count_u8_elems - Count the number of u8 elements in a property
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*
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* @np: device node from which the property value is to be read.
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