[PATCH v2 10/12] pwm: register dependency parser for firmware nodes

[Tomeu Vizoso]

So others can find out what depends on pwm controllers, as specified
in bindings/pwm/pwm.txt.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso at collabora.com>
---

Changes in v2: None

 drivers/pwm/core.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 3a7769f..81b4fc0 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -917,11 +917,39 @@ static const struct file_operations pwm_debugfs_ops = {
        .release = seq_release,
 };

+static void pwm_get_dependencies(struct fwnode_handle *fwnode,
+                                struct list_head *deps)
+{
+       struct device_node *np;
+       struct of_phandle_args pspec;
+       int count, i, ret;
+
+       np = to_of_node(fwnode);
+       if (!np)
+               return;
+
+       count = of_count_phandle_with_args(np, "pwms",
+                                          "#pwm-cells");
+       for (i = 0; i < count; i++) {
+               ret = of_parse_phandle_with_args(np, "pwms",
+                                                "#pwm-cells", i,
+                                                &pspec);
+               if (ret || !pspec.np)
+                       continue;
+
+               fwnode_add_dependency(&pspec.np->fwnode, deps);
+
+               of_node_put(pspec.np);
+       }
+}
+
 static int __init pwm_debugfs_init(void)
 {
        debugfs_create_file("pwm", S_IFREG | S_IRUGO, NULL, NULL,
                            &pwm_debugfs_ops);

+       fwnode_add_dependency_parser(pwm_get_dependencies);
+
        return 0;
 }

-- 
2.4.1