[PATCH v4 2/3] drm/mipi-dbi: Add driver_private member to struct mipi_dbi_dev

["Noralf Trønnes" <noralf@tronnes.org>]

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>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
---
 include/drm/drm_mipi_dbi.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/drm/drm_mipi_dbi.h b/include/drm/drm_mipi_dbi.h
index 6fe13cce2670..dad2f187b64b 100644
--- 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)
-- 
2.33.0