drm/vc4: Use common helpers for debugfs setup by the driver components.

The global list of all debugfs entries for the driver was painful: the
list couldn't see into the components' structs, so each component had
its own debugs show function to find the component, then find the
regset and dump it.  The components also had to be careful to check
that they were actually registered in vc4 before dereferencing
themselves, in case they weren't probed on a particular platform.
They routinely failed at that.

Instead, we can have the components add their debugfs callbacks to a
little list in vc4 to be registered at drm_dev_register() time, which
gets vc4_debugfs.c out of the business of knowing the whole list of
components.

Thanks to this change, dsi0 (if it existed) would register its node.

v2: Rebase on hvs_underrun addition.
v3: whitespace fixup

Signed-off-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20190401183559.3823-1-eric@anholt.net
Reviewed-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>

drivers/gpu/drm/vc4/vc4_txp.c

@@ -169,24 +169,6 @@ static const struct debugfs_reg32 txp_regs[] = {
 	VC4_REG32(TXP_PROGRESS),
 };
 
-#ifdef CONFIG_DEBUG_FS
-int vc4_txp_debugfs_regs(struct seq_file *m, void *unused)
-{
-	struct drm_info_node *node = (struct drm_info_node *)m->private;
-	struct drm_device *dev = node->minor->dev;
-	struct vc4_dev *vc4 = to_vc4_dev(dev);
-	struct vc4_txp *txp = vc4->txp;
-	struct drm_printer p = drm_seq_file_printer(m);
-
-	if (!txp)
-		return 0;
-
-	drm_print_regset32(&p, &txp->regset);
-
-	return 0;
-}
-#endif
-
 static int vc4_txp_connector_get_modes(struct drm_connector *connector)
 {
 	struct drm_device *dev = connector->dev;
@@ -424,6 +406,8 @@ static int vc4_txp_bind(struct device *dev, struct device *master, void *data)
 	dev_set_drvdata(dev, txp);
 	vc4->txp = txp;
 
+	vc4_debugfs_add_regset32(drm, "txp_regs", &txp->regset);
+
 	return 0;
 }