drm/bridge: tc358775: Convert to drm_of_get_data_lanes_count_ep

Convert driver to use this new helper to standardize
OF "data-lanes" parsing.

Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Andrzej Hajda <andrzej.hajda@intel.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Maxime Ripard <maxime@cerno.tech>
Cc: Robert Foss <robert.foss@linaro.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
To: dri-devel@lists.freedesktop.org
Link: https://patchwork.freedesktop.org/patch/msgid/20220524010522.528569-7-marex@denx.de

diff --git a/drivers/gpu/drm/bridge/tc358775.c b/drivers/gpu/drm/bridge/tc358775.c
index 62a7ef3..5b1fb8e 100644 (file)
--- a/drivers/gpu/drm/bridge/tc358775.c
+++ b/drivers/gpu/drm/bridge/tc358775.c
@@ -529,8 +529,7 @@ static int tc358775_parse_dt(struct device_node *np, struct tc_data *tc)
        struct device_node *endpoint;
        struct device_node *parent;
        struct device_node *remote;
-       struct property *prop;
-       int len = 0;
+       int dsi_lanes;
 
        /*
         * To get the data-lanes of dsi, we need to access the dsi0_out of port1
@@ -544,25 +543,15 @@ static int tc358775_parse_dt(struct device_node *np, struct tc_data *tc)
                of_node_put(endpoint);
                if (parent) {
                        /* dsi0 port 1 */
-                       endpoint = of_graph_get_endpoint_by_regs(parent, 1, -1);
+                       dsi_lanes = drm_of_get_data_lanes_count_ep(parent, 1, -1, 1, 4);
                        of_node_put(parent);
-                       if (endpoint) {
-                               prop = of_find_property(endpoint, "data-lanes",
-                                                       &len);
-                               of_node_put(endpoint);
-                               if (!prop) {
-                                       dev_err(tc->dev,
-                                               "failed to find data lane\n");
-                                       return -EPROBE_DEFER;
-                               }
-                       }
                }
        }
 
-       tc->num_dsi_lanes = len / sizeof(u32);
+       if (dsi_lanes < 0)
+               return dsi_lanes;
 
-       if (tc->num_dsi_lanes < 1 || tc->num_dsi_lanes > 4)
-               return -EINVAL;
+       tc->num_dsi_lanes = dsi_lanes;
 
        tc->host_node = of_graph_get_remote_node(np, 0, 0);
        if (!tc->host_node)