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authorThierry Reding <treding@nvidia.com>2014-08-06 08:53:39 +0200
committerThierry Reding <treding@nvidia.com>2014-11-13 13:56:14 +0100
commit3ef0592426da2e21bd3a265e9376cddffff931c1 (patch)
tree9ae8b9f708422585dfbf76db110f08beffa29e9a /drivers/gpu/drm/drm_mipi_dsi.c
parentdrm/dsi: Implement DCS set_{column,page}_address commands (diff)
downloadlinux-3ef0592426da2e21bd3a265e9376cddffff931c1.tar.xz
linux-3ef0592426da2e21bd3a265e9376cddffff931c1.zip
drm/dsi: Resolve MIPI DSI device from phandle
Add a function, of_find_mipi_dsi_device_by_node(), that can be used to resolve a phandle to a MIPI DSI device. Acked-by: Andrzej Hajda <a.hajda@samsung.com> Reviewed-by: Sean Paul <seanpaul@chromium.org> Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'drivers/gpu/drm/drm_mipi_dsi.c')
-rw-r--r--drivers/gpu/drm/drm_mipi_dsi.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index 2f39372e58b6..3850b3529601 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -67,6 +67,29 @@ static struct bus_type mipi_dsi_bus_type = {
.pm = &mipi_dsi_device_pm_ops,
};
+static int of_device_match(struct device *dev, void *data)
+{
+ return dev->of_node == data;
+}
+
+/**
+ * of_find_mipi_dsi_device_by_node() - find the MIPI DSI device matching a
+ * device tree node
+ * @np: device tree node
+ *
+ * Return: A pointer to the MIPI DSI device corresponding to @np or NULL if no
+ * such device exists (or has not been registered yet).
+ */
+struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np)
+{
+ struct device *dev;
+
+ dev = bus_find_device(&mipi_dsi_bus_type, NULL, np, of_device_match);
+
+ return dev ? to_mipi_dsi_device(dev) : NULL;
+}
+EXPORT_SYMBOL(of_find_mipi_dsi_device_by_node);
+
static void mipi_dsi_dev_release(struct device *dev)
{
struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);