drm: sun4i: de2/de3: add generic blender register reference function

The DE2 and DE3 engines have a blender register range within the
mixer engine register map, whereas the DE33 separates this out into
a separate display group.

Prepare for this by adding a function to look the blender reference up,
with a subsequent patch to add a conditional based on the DE type.

Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Ryan Walklin <ryan@testtoast.com>
Acked-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Link: https://lore.kernel.org/r/20250528092431.28825-4-ryan@testtoast.com
Signed-off-by: Maxime Ripard <mripard@kernel.org>

diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.h b/drivers/gpu/drm/sun4i/sun8i_mixer.h
index d34e7fb3143a37777a829dadb4e17e59a25ed050..b75008d05fc98081497751fe5c56d7b72c3ca1ac 100644 (file)
--- a/drivers/gpu/drm/sun4i/sun8i_mixer.h
+++ b/drivers/gpu/drm/sun4i/sun8i_mixer.h
@@ -222,6 +222,12 @@ sun8i_blender_base(struct sun8i_mixer *mixer)
        return mixer->cfg->de_type == SUN8I_MIXER_DE3 ? DE3_BLD_BASE : DE2_BLD_BASE;
 }
 
+static inline struct regmap *
+sun8i_blender_regmap(struct sun8i_mixer *mixer)
+{
+       return mixer->engine.regs;
+}
+
 static inline u32
 sun8i_channel_base(struct sun8i_mixer *mixer, int channel)
 {