summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/drm_of.c
diff options
context:
space:
mode:
authorJagan Teki <jagan@amarulasolutions.com>2022-02-02 21:34:14 +0530
committerMaxime Ripard <maxime@cerno.tech>2022-02-25 17:08:37 +0100
commit80253168dbfd256bca97cf7f13312863c5a7f2e5 (patch)
treed7860e0752777c82c1e1afcf88b262ffd39176da /drivers/gpu/drm/drm_of.c
parent79b44684a14e363d24c299b772f037344ad8c8dc (diff)
drm: of: Lookup if child node has panel or bridge
Devices can also be child nodes when we also control that device through the upstream device (ie, MIPI-DCS for a MIPI-DSI device). drm_of_find_panel_or_bridge can lookup panel or bridge for a given device has port and endpoint and it fails to lookup if the device has a child nodes. This patch add support to lookup for a child node of the given parent that isn't either port or ports. Example OF graph representation of DSI host, which has port but not has ports and has child panel node. dsi { compatible = "allwinner,sun6i-a31-mipi-dsi"; #address-cells = <1>; #size-cells = <0>; port { dsi_in_tcon0: endpoint { remote-endpoint = <tcon0_out_dsi>; }; panel@0 { reg = <0>; }; }; Example OF graph representation of DSI host, which has ports but not has port and has child panel node. dsi { compatible = "samsung,exynos5433-mipi-dsi"; #address-cells = <1>; #size-cells = <0>; ports { #address-cells = <1>; #size-cells = <0>; port@0 { reg = <0>; dsi_to_mic: endpoint { remote-endpoint = <&mic_to_dsi>; }; }; }; panel@0 { reg = <0>; }; }; Example OF graph representation of DSI host, which has neither a port nor a ports but has child panel node. dsi0 { compatible = "ste,mcde-dsi"; #address-cells = <1>; #size-cells = <0>; panel@0 { reg = <0>; }; }; Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> Signed-off-by: Maxime Ripard <maxime@cerno.tech> Link: https://patchwork.freedesktop.org/patch/msgid/20220202160414.16493-1-jagan@amarulasolutions.com
Diffstat (limited to 'drivers/gpu/drm/drm_of.c')
-rw-r--r--drivers/gpu/drm/drm_of.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
index 59d368ea006b..9d90cd75c457 100644
--- a/drivers/gpu/drm/drm_of.c
+++ b/drivers/gpu/drm/drm_of.c
@@ -249,6 +249,21 @@ int drm_of_find_panel_or_bridge(const struct device_node *np,
if (panel)
*panel = NULL;
+ /**
+ * Devices can also be child nodes when we also control that device
+ * through the upstream device (ie, MIPI-DCS for a MIPI-DSI device).
+ *
+ * Lookup for a child node of the given parent that isn't either port
+ * or ports.
+ */
+ for_each_available_child_of_node(np, remote) {
+ if (of_node_name_eq(remote, "port") ||
+ of_node_name_eq(remote, "ports"))
+ continue;
+
+ goto of_find_panel_or_bridge;
+ }
+
/*
* of_graph_get_remote_node() produces a noisy error message if port
* node isn't found and the absence of the port is a legit case here,
@@ -259,6 +274,8 @@ int drm_of_find_panel_or_bridge(const struct device_node *np,
return -ENODEV;
remote = of_graph_get_remote_node(np, port, endpoint);
+
+of_find_panel_or_bridge:
if (!remote)
return -ENODEV;