of: Let of_for_each_phandle fallback to non-negative cell_count (e42ee610) · Commits · 戴 / test

Referencing device tree nodes from a property allows to pass arguments. This is for example used for referencing gpios. This looks as follows: gpio_ctrl: gpio-controller { #gpio-cells = <2> ... } someothernode { gpios = <&gpio_ctrl 5 0 &gpio_ctrl 3 0>; ... } To know the number of arguments this must be either fixed, or the referenced node is checked for a $cells_name (here: "#gpio-cells") property and with this information the start of the second reference can be determined. Currently regulators are referenced with no additional arguments. To allow some optional arguments without having to change all referenced nodes this change introduces a way to specify a default cell_count. So when a phandle is parsed we check for the $cells_name property and use it as before if present. If it is not present we fall back to cells_count if non-negative and only fail if cells_count is smaller than zero. Signed-off-by:

Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by:

Rob Herring <robh@kernel.org>

drivers/of/base.c

+17 −8

Original line number	Diff line number	Diff line
		@@ -1335,12 +1335,21 @@ int of_phandle_iterator_next(struct of_phandle_iterator *it)

		if (of_property_read_u32(it->node, it->cells_name,
		&count)) {
		/*
		* If both cell_count and cells_name is given,
		* fall back to cell_count in absence
		* of the cells_name property
		*/
		if (it->cell_count >= 0) {
		count = it->cell_count;
		} else {
		pr_err("%pOF: could not get %s for %pOF\n",
		it->parent,
		it->cells_name,
		it->node);
		goto err;
		}
		}
		} else {
		count = it->cell_count;
		}
		@@ -1505,7 +1514,7 @@ int of_parse_phandle_with_args(const struct device_node np, const char list_na
		{
		if (index < 0)
		return -EINVAL;
		return __of_parse_phandle_with_args(np, list_name, cells_name, 0,
		return __of_parse_phandle_with_args(np, list_name, cells_name, -1,
		index, out_args);
		}
		EXPORT_SYMBOL(of_parse_phandle_with_args);
		@@ -1588,7 +1597,7 @@ int of_parse_phandle_with_args_map(const struct device_node *np,
		if (!pass_name)
		goto free;

		ret = __of_parse_phandle_with_args(np, list_name, cells_name, 0, index,
		ret = __of_parse_phandle_with_args(np, list_name, cells_name, -1, index,
		out_args);
		if (ret)
		goto free;
		@@ -1756,7 +1765,7 @@ int of_count_phandle_with_args(const struct device_node np, const char list_na
		struct of_phandle_iterator it;
		int rc, cur_index = 0;

		rc = of_phandle_iterator_init(&it, np, list_name, cells_name, 0);
		rc = of_phandle_iterator_init(&it, np, list_name, cells_name, -1);
		if (rc)
		return rc;

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