drm/i2c: tda998x: add OF support for finding attached CRTCs

Add support to find the attached CRTCs via OF using the newly introduced
helper.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 12 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index d4762799351d..4dcf47417aee 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -25,6 +25,7 @@
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_encoder_slave.h>
 #include <drm/drm_edid.h>
+#include <drm/drm_of.h>
 #include <drm/i2c/tda998x.h>
 
 #define DBG(fmt, ...) DRM_DEBUG(fmt"\n", ##__VA_ARGS__)
@@ -1515,6 +1516,7 @@ static int tda998x_bind(struct device *dev, struct device *master, void *data)
         struct i2c_client *client = to_i2c_client(dev);
         struct drm_device *drm = data;
         struct tda998x_priv2 *priv;
+        uint32_t crtcs = 0;
         int ret;
 
         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
@@ -1523,9 +1525,18 @@ static int tda998x_bind(struct device *dev, struct device *master, void *data)
 
         dev_set_drvdata(dev, priv);
 
+        if (dev->of_node)
+                crtcs = drm_of_find_possible_crtcs(drm, dev->of_node);
+
+        /* If no CRTCs were found, fall back to our old behaviour */
+        if (crtcs == 0) {
+                dev_warn(dev, "Falling back to first CRTC\n");
+                crtcs = 1 << 0;
+        }
+
         priv->base.encoder = &priv->encoder;
         priv->connector.interlace_allowed = 1;
-        priv->encoder.possible_crtcs = 1 << 0;
+        priv->encoder.possible_crtcs = crtcs;
 
         ret = tda998x_create(client, &priv->base);
         if (ret)