media: aspeed: add AST2600 support

Video engine in AST2600 has the exactly same register set with
AST2500 except VR084 register which provides more precise JPEG
size read back. This commit adds support for the difference and
adds 'aspeed,ast2600-video-engine' compatible OF string.

Signed-off-by: Jae Hyun Yoo <[e-mail]>
Reviewed-by: Joel Stanley <[e-mail]>
Reviewed-by: Eddie James <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/platform/aspeed-video.c

···
 // SPDX-License-Identifier: GPL-2.0-or-later
 // Copyright 2020 IBM Corp.
-// Copyright (c) 2019 Intel Corporation
+// Copyright (c) 2019-2020 Intel Corporation
 
 #include <linux/atomic.h>
 #include <linux/bitfield.h>
···
 #define  VE_COMP_CTRL_HQ_DCT_CHR	GENMASK(26, 22)
 #define  VE_COMP_CTRL_HQ_DCT_LUM	GENMASK(31, 27)
 
-#define VE_OFFSET_COMP_STREAM		0x078
+#define AST2400_VE_COMP_SIZE_READ_BACK	0x078
+#define AST2600_VE_COMP_SIZE_READ_BACK	0x084
 
 #define VE_SRC_LR_EDGE_DET		0x090
 #define  VE_SRC_LR_EDGE_DET_LEFT	GENMASK(11, 0)
···
 
 static const struct aspeed_video_config ast2400_config = {
 	.jpeg_mode = AST2400_VE_SEQ_CTRL_JPEG_MODE,
-	.comp_size_read = VE_OFFSET_COMP_STREAM,
+	.comp_size_read = AST2400_VE_COMP_SIZE_READ_BACK,
 };
 
 static const struct aspeed_video_config ast2500_config = {
 	.jpeg_mode = AST2500_VE_SEQ_CTRL_JPEG_MODE,
-	.comp_size_read = VE_OFFSET_COMP_STREAM,
+	.comp_size_read = AST2400_VE_COMP_SIZE_READ_BACK,
+};
+
+static const struct aspeed_video_config ast2600_config = {
+	.jpeg_mode = AST2500_VE_SEQ_CTRL_JPEG_MODE,
+	.comp_size_read = AST2600_VE_COMP_SIZE_READ_BACK,
 };
 
 static const u32 aspeed_video_jpeg_header[ASPEED_VIDEO_JPEG_HEADER_SIZE] = {
···
 static const struct of_device_id aspeed_video_of_match[] = {
 	{ .compatible = "aspeed,ast2400-video-engine", .data = &ast2400_config },
 	{ .compatible = "aspeed,ast2500-video-engine", .data = &ast2500_config },
+	{ .compatible = "aspeed,ast2600-video-engine", .data = &ast2600_config },
 	{}
 };
 MODULE_DEVICE_TABLE(of, aspeed_video_of_match);