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SubjectRe: [PATCH v2 02/15] [media] mtk-mipicsi: add mediatek mipicsi driver for mt2712
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Hi, Stu:

On Tue, 2019-04-16 at 17:30 +0800, Stu Hsieh wrote:
> This patch add mediatek mipicsi driver for mt2712,
> including probe function to get the value from device tree,
> and register to v4l2 the host device.
>
> Signed-off-by: Stu Hsieh <stu.hsieh@mediatek.com>
> ---
> drivers/media/platform/mtk-mipicsi/Makefile | 4 +
> .../media/platform/mtk-mipicsi/mtk_mipicsi.c | 767 ++++++++++++++++++
> 2 files changed, 771 insertions(+)
> create mode 100644 drivers/media/platform/mtk-mipicsi/Makefile
> create mode 100644 drivers/media/platform/mtk-mipicsi/mtk_mipicsi.c
>
> diff --git a/drivers/media/platform/mtk-mipicsi/Makefile b/drivers/media/platform/mtk-mipicsi/Makefile
> new file mode 100644
> index 000000000000..326a5e3808fa
> --- /dev/null
> +++ b/drivers/media/platform/mtk-mipicsi/Makefile
> @@ -0,0 +1,4 @@
> +mtk-mipicsi-y += mtk_mipicsi.o
> +
> +obj-$(CONFIG_VIDEO_MEDIATEK_MIPICSI) += mtk-mipicsi.o
> +
> diff --git a/drivers/media/platform/mtk-mipicsi/mtk_mipicsi.c b/drivers/media/platform/mtk-mipicsi/mtk_mipicsi.c
> new file mode 100644
> index 000000000000..e26bebe17fe5
> --- /dev/null
> +++ b/drivers/media/platform/mtk-mipicsi/mtk_mipicsi.c
> @@ -0,0 +1,767 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2017 MediaTek Inc.
> + * Author: Ricky Zhang <ricky.zhang@mediatek.com>
> + * Baoyin Zhang <baoyin.zhang@mediatek.com>
> + * Alan Yue <alan.yue@mediatek.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * http://www.gnu.org/licenses/gpl-2.0.html for more details.
> + */
> +
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/io.h>
> +#include <linux/delay.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/err.h>
> +#include <linux/errno.h>
> +#include <linux/fs.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/mm.h>
> +#include <linux/moduleparam.h>
> +#include <linux/device.h>
> +#include <linux/platform_device.h>
> +#include <linux/clk.h>
> +#include <linux/sched.h>
> +#include <linux/slab.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/iommu.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +#include <media/v4l2-common.h>
> +#include <media/v4l2-dev.h>
> +#include <media/videobuf2-dma-contig.h>
> +#include <media/soc_camera.h>
> +#include <media/drv-intf/soc_mediabus.h>
> +#include <media/videobuf2-core.h>
> +#include <linux/videodev2.h>
> +#include <soc/mediatek/smi.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/syscon.h>
> +
> +#ifdef CONFIG_VB2_MEDIATEK_DMA_SG
> +#include "mtkbuf-dma-cache-sg.h"
> +#endif
> +
> +#define MTK_MIPICSI_DRV_NAME "mtk-mipicsi"
> +#define MTK_PLATFORM_STR "platform:mt2712"
> +#define MIPICSI_COMMON_CLK 2
> +#define MTK_CAMDMA_MAX_NUM 4U
> +#define MIPICSI_CLK (MIPICSI_COMMON_CLK + MTK_CAMDMA_MAX_NUM)
> +#define MTK_DATAWIDTH_8 (0x01U << 7U)
> +#define MAX_SUPPORT_WIDTH 4096U
> +#define MAX_SUPPORT_HEIGHT 4096U
> +#define MAX_BUFFER_NUM 32U
> +#define VID_LIMIT_BYTES (100U * 1024U * 1024U)
> +
> +/* buffer for one video frame */
> +struct mtk_mipicsi_buf {
> + struct list_head queue;
> + struct vb2_buffer *vb;
> + dma_addr_t vb_dma_addr_phy;
> + int prepare_flag;
> +};
> +
> +struct mtk_mipicsi_dev {
> + struct soc_camera_host soc_host;
> + struct platform_device *pdev;
> + unsigned int camsv_num;
> + struct v4l2_device v4l2_dev;
> + struct device *larb_pdev;
> + void __iomem *ana;
> + void __iomem *seninf_ctrl;

Separating register control to another patch looks strange to me.
Register control is the bottom part and this patch is the top part. You
send a top part first then the bottom part. 'seninf_ctrl' is useless in
this patch, you may move this to the patch that use this variable or
merge that patch into this patch.

Regards,
CK

> + void __iomem *seninf;
> + struct regmap *seninf_top;
> + void __iomem *seninf_mux[MTK_CAMDMA_MAX_NUM];
> + void __iomem *camsv[MTK_CAMDMA_MAX_NUM];
> + const struct soc_camera_format_xlate *current_fmt;
> + u16 width_flags; /* max 12 bits */
> + struct list_head capture_list[MTK_CAMDMA_MAX_NUM];
> + struct list_head fb_list;
> + spinlock_t lock;
> + spinlock_t queue_lock;
> + struct mtk_mipicsi_buf cam_buf[MAX_BUFFER_NUM];
> + bool streamon;
> + unsigned long frame_cnt[MTK_CAMDMA_MAX_NUM];
> + unsigned int link;
> + unsigned long enqueue_cnt;
> + unsigned long dequeue_cnt;
> + struct v4l2_ctrl_handler ctrl_hdl;
> + char drv_name[16];
> + u32 id;
> + int clk_num;
> + struct clk *clk[MIPICSI_CLK];
> +};
> +

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