drm/mipi-dbi: Add driver_private member to struct mipi_dbi_dev

devm_drm_dev_alloc() can't allocate structures that embed a structure
which then again embeds drm_device. Workaround this by adding a
driver_private pointer to struct mipi_dbi_dev which the driver can use for
its additional state.

v3:
- Add documentation

Acked-by: Maxime Ripard <maxime@cerno.tech>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20220227124713.39766-5-noralf@tronnes.org

diff --git a/include/drm/drm_mipi_dbi.h b/include/drm/drm_mipi_dbi.h
index 6fe13cce2670b23ad171064dd241c7e3199c0435..dad2f187b64b1c0ad6aec6e72fb5baa6292d7188 100644 (file)
--- a/include/drm/drm_mipi_dbi.h
+++ b/include/drm/drm_mipi_dbi.h
@@ -130,6 +130,14 @@ struct mipi_dbi_dev {
         * @dbi: MIPI DBI interface
         */
        struct mipi_dbi dbi;
+
+       /**
+        * @driver_private: Driver private data.
+        *                  Necessary for drivers with private data since devm_drm_dev_alloc()
+        *                  can't allocate structures that embed a structure which then again
+        *                  embeds drm_device.
+        */
+       void *driver_private;
 };
 
 static inline struct mipi_dbi_dev *drm_to_mipi_dbi_dev(struct drm_device *drm)