drm/vc4: hdmi: Deal with multiple debugfs files

The HDMI driver was registering a single debugfs file so far with the name
hdmi_regs.

Obviously, this is not going to work anymore when will have multiple HDMI
controllers since we will end up trying to register two files with the same
name.

Let's use the variant to avoid that name conflict.
Signed-off-by: NMaxime Ripard <maxime@cerno.tech>
Tested-by: NChanwoo Choi <cw00.choi@samsung.com>
Tested-by: NHoegeun Kwon <hoegeun.kwon@samsung.com>
Tested-by: NStefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: NDave Stevenson <dave.stevenson@raspberrypi.com>
Link: https://patchwork.freedesktop.org/patch/msgid/9505c1eb40b3ef3709277bf9e8af77917b249c32.1599120059.git-series.maxime@cerno.tech

drivers/gpu/drm/vc4/vc4_hdmi.c

@@ -1369,7 +1369,9 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
 	if (ret)
 		goto err_destroy_encoder;
 
-	vc4_debugfs_add_file(drm, "hdmi_regs", vc4_hdmi_debugfs_regs, vc4_hdmi);
+	vc4_debugfs_add_file(drm, variant->debugfs_name,
+			     vc4_hdmi_debugfs_regs,
+			     vc4_hdmi);
 
 	return 0;
 
@@ -1447,6 +1449,7 @@ static int vc4_hdmi_dev_remove(struct platform_device *pdev)
 
 static const struct vc4_hdmi_variant bcm2835_variant = {
 	.encoder_type		= VC4_ENCODER_TYPE_HDMI0,
+	.debugfs_name		= "hdmi_regs",
 	.registers		= vc4_hdmi_fields,
 	.num_registers		= ARRAY_SIZE(vc4_hdmi_fields),
 

drivers/gpu/drm/vc4/vc4_hdmi.h

@@ -30,6 +30,9 @@ struct vc4_hdmi_variant {
 	/* Encoder Type for that controller */
 	enum vc4_encoder_type encoder_type;
 
+	/* Filename to expose the registers in debugfs */
+	const char *debugfs_name;
+
 	/* List of the registers available on that variant */
 	const struct vc4_hdmi_register *registers;