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>

diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index d476279..4dcf474 100644 (file)
--- 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)