[PATCH v4 5/7] drm/bridge: anx7625: Register number of Type C switches

[Prashant Malani]

Parse the "switches" node, if available, and count and store the number
of Type-C switches within it. Since we currently don't do anything with
this info, no functional changes are expected from this change.

This patch sets a foundation for the actual registering of Type-C
switches with the Type-C connector class framework.

Reviewed-by: Nícolas F. R. A. Prado <nfraprado at collabora.com>
Tested-by: Nícolas F. R. A. Prado <nfraprado at collabora.com>
Signed-off-by: Prashant Malani <pmalani at chromium.org>
---

Changes since v3:
- No changes.

Changes since v2:
- Move ret variable to Patch v3 6/7.
- Make error print a dev_dbg, since it is noisy.
- Added Reviewed-by and Tested-by tags.

Changes since v1:
- No changes.

 drivers/gpu/drm/bridge/analogix/anx7625.c | 18 ++++++++++++++++++
 drivers/gpu/drm/bridge/analogix/anx7625.h |  1 +
 2 files changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index 53a5da6c49dd..e3d4c2738b8c 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -2581,6 +2581,20 @@ static void anx7625_runtime_disable(void *data)
 	pm_runtime_disable(data);
 }
 
+static int anx7625_register_typec_switches(struct device *device, struct anx7625_data *ctx)
+{
+	struct device_node *of = of_get_child_by_name(device->of_node, "switches");
+
+	if (!of)
+		return -ENODEV;
+
+	ctx->num_typec_switches = of_get_child_count(of);
+	if (ctx->num_typec_switches <= 0)
+		return -ENODEV;
+
+	return 0;
+}
+
 static int anx7625_i2c_probe(struct i2c_client *client,
 			     const struct i2c_device_id *id)
 {
@@ -2686,6 +2700,10 @@ static int anx7625_i2c_probe(struct i2c_client *client,
 	if (platform->pdata.intp_irq)
 		queue_work(platform->workqueue, &platform->work);
 
+	ret = anx7625_register_typec_switches(dev, platform);
+	if (ret)
+		dev_dbg(dev, "Didn't register Type C switches, err: %d\n", ret);
+
 	platform->bridge.funcs = &anx7625_bridge_funcs;
 	platform->bridge.of_node = client->dev.of_node;
 	if (!anx7625_of_panel_on_aux_bus(&client->dev))
diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.h b/drivers/gpu/drm/bridge/analogix/anx7625.h
index e257a84db962..d5cbca708842 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.h
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.h
@@ -473,6 +473,7 @@ struct anx7625_data {
 	struct drm_connector *connector;
 	struct mipi_dsi_device *dsi;
 	struct drm_dp_aux aux;
+	int num_typec_switches;
 };
 
 #endif  /* __ANX7625_H__ */
-- 
2.36.1.476.g0c4daa206d-goog