media: imx: imx-mipi-csis: Add version register

Register at offset 0x00 isn't documented, but the NXP BSP
imx8-mipi-csi2-sam driver defines it as a version register. Tests on
i.MX7D and i.MX8MP have confirmed this, with values matching the version
of the IP core specified in the respective reference manuals.

This commit doesn't make use of the version register at runtime as the
compatible strings are enough to identify the IP core version.
Nonetheless, capturing the information in register definitions that
don't affect the code negatively is useful for future development.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Rui Miguel Silva <rmfrfs@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

diff --git a/drivers/media/platform/nxp/imx-mipi-csis.c b/drivers/media/platform/nxp/imx-mipi-csis.c
index 09a220c1bfe8ed7834bf1216ca6f3bc9a6aeca04..8674aaad5fa0569de981513e8f9e679e44450626 100644 (file)
--- a/drivers/media/platform/nxp/imx-mipi-csis.c
+++ b/drivers/media/platform/nxp/imx-mipi-csis.c
@@ -46,6 +46,11 @@
 
 /* Register map definition */
 
+/* CSIS version */
+#define MIPI_CSIS_VERSION                      0x00
+#define MIPI_CSIS_VERSION_IMX7D                        0x03030505
+#define MIPI_CSIS_VERSION_IMX8MP               0x03060301
+
 /* CSIS common control */
 #define MIPI_CSIS_CMN_CTRL                     0x04
 #define MIPI_CSIS_CMN_CTRL_UPDATE_SHADOW       BIT(16)