So the GPIO subsystem can be queried about the dependencies of nodes
that consume GPIOs, as specified in bindings/gpio/gpio.txt.
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx>
---
Changes in v2: None
drivers/gpio/gpiolib.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 54 insertions(+)
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index bf4bd1d..6a3e83f 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2388,4 +2388,58 @@ static int __init gpiolib_debugfs_init(void)
}
subsys_initcall(gpiolib_debugfs_init);
+static void gpio_get_dependencies(struct fwnode_handle *fwnode,
+ struct list_head *deps)
+{
+ struct device_node *np;
+ struct property *pp;
+ struct of_phandle_args pspec;
+ int count, i, ret;
+
+ np = to_of_node(fwnode);
+ if (!np)
+ return;
+
+ for_each_property_of_node(np, pp) {
+ if (strcmp(pp->name, "gpio") &&
+ strcmp(pp->name, "gpios") &&
+ !strends(pp->name, "-gpios") &&
+ !strends(pp->name, "-gpio"))
+ continue;
+
+ count = of_count_phandle_with_args(np, pp->name,
+ "#gpio-cells");
+ for (i = 0; i < count; i++) {
+ ret = of_parse_phandle_with_args(np, pp->name,
+ "#gpio-cells", i,
+ &pspec);
+ if (ret || !pspec.np)
+ continue;
+
+ fwnode_add_dependency(&pspec.np->fwnode, deps);
+
+ of_node_put(pspec.np);
+ }
+ }
+
+ for (i = 0;; i++) {
+ ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3,
+ i, &pspec);
+ if (ret)
+ break;
+
+ fwnode_add_dependency(&pspec.np->fwnode, deps);
+
+ of_node_put(pspec.np);
+ }
+}
+
+static int __init gpiolib_init(void)
+{
+ fwnode_add_dependency_parser(gpio_get_dependencies);
+
+ return 0;
+}
+device_initcall(gpiolib_init);
+
#endif /* DEBUG_FS */
--
2.4.1
--
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