Re: [PATCH v6 04/17] media: rkisp1: add Rockchip MIPI Synopsys DPHY driver

Laurent Pinchart
2019-03-10T17:49:49Z

Hi Jacob,

A few more comments on the code this time.

First of all, this has bit-rotten a bit and doesn't compile. The
following patch fixes it. Feel free to squash it into this patch (no
need to credit me or add my SoB line).

commit 297399bb5e3ac8d50f27f1c911fe7e5f26983e56
Author: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Date: Sat Mar 2 02:18:19 2019 +0200

media: rkisp1: Fix compilation errors

The code has bit-rotten since March 2018, fix compilation errors.

The new V4L2 async notifier API requires notifiers to be initialized by
a call to v4l2_async_notifier_init() before being used, do so.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

diff --git a/drivers/media/platform/rockchip/isp1/mipi_dphy_sy.c b/drivers/media/platform/rockchip/isp1/mipi_dphy_sy.c
index 32140960557a..8a7d070314c9 100644
--- a/drivers/media/platform/rockchip/isp1/mipi_dphy_sy.c
+++ b/drivers/media/platform/rockchip/isp1/mipi_dphy_sy.c
@@ -697,7 +697,7 @@ static int rockchip_mipidphy_fwnode_parse(struct device *dev,
container_of(asd, struct sensor_async_subdev, asd);
struct v4l2_mbus_config *config = &s_asd->mbus;

- if (vep->bus_type != V4L2_MBUS_CSI2) {
+ if (vep->bus_type != V4L2_MBUS_CSI2_DPHY) {
dev_err(dev, "Only CSI2 bus type is currently supported\n");
return -EINVAL;
}
@@ -707,7 +707,7 @@ static int rockchip_mipidphy_fwnode_parse(struct device *dev,
return -EINVAL;
}

- config->type = V4L2_MBUS_CSI2;
+ config->type = V4L2_MBUS_CSI2_DPHY;
config->flags = vep->bus.mipi_csi2.flags;
s_asd->lanes = vep->bus.mipi_csi2.num_data_lanes;

@@ -745,6 +745,8 @@ static int rockchip_mipidphy_media_init(struct mipidphy_priv *priv)
if (ret < 0)
return ret;

+ v4l2_async_notifier_init(&priv->notifier);
+
ret = v4l2_async_notifier_parse_fwnode_endpoints_by_port(
priv->dev, &priv->notifier,
sizeof(struct sensor_async_subdev), 0,
@@ -752,7 +754,7 @@ static int rockchip_mipidphy_media_init(struct mipidphy_priv *priv)
if (ret < 0)
return ret;

- if (!priv->notifier.num_subdevs)
+ if (list_empty(&priv->notifier.asd_list))
return -ENODEV; /* no endpoint */

priv->sd.subdev_notifier = &priv->notifier;

Then, please see below for additional comments.

On Thu, Mar 08, 2018 at 05:47:54PM +0800, Jacob Chen wrote:
> From: Jacob Chen <jacob2.chen@rock-chips.com>
>
> This commit adds a subdev driver for Rockchip MIPI Synopsys DPHY driver
>
> Signed-off-by: Jacob Chen <jacob2.chen@rock-chips.com>
> Signed-off-by: Shunqian Zheng <zhengsq@rock-chips.com>
> Signed-off-by: Tomasz Figa <tfiga@chromium.org>
> ---
> .../media/platform/rockchip/isp1/mipi_dphy_sy.c | 868 +++++++++++++++++++++
> .../media/platform/rockchip/isp1/mipi_dphy_sy.h | 15 +
> 2 files changed, 883 insertions(+)
> create mode 100644 drivers/media/platform/rockchip/isp1/mipi_dphy_sy.c
> create mode 100644 drivers/media/platform/rockchip/isp1/mipi_dphy_sy.h
>
> diff --git a/drivers/media/platform/rockchip/isp1/mipi_dphy_sy.c b/drivers/media/platform/rockchip/isp1/mipi_dphy_sy.c
> new file mode 100644
> index 000000000000..32140960557a
> --- /dev/null
> +++ b/drivers/media/platform/rockchip/isp1/mipi_dphy_sy.c
> @@ -0,0 +1,868 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Rockchip MIPI Synopsys DPHY driver
> + *
> + * Copyright (C) 2017 Fuzhou Rockchip Electronics Co., Ltd.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/syscon.h>
> +#include <media/media-entity.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-fwnode.h>
> +#include <media/v4l2-subdev.h>
> +
> +#define RK3288_GRF_SOC_CON6 0x025c
> +#define RK3288_GRF_SOC_CON8 0x0264
> +#define RK3288_GRF_SOC_CON9 0x0268
> +#define RK3288_GRF_SOC_CON10 0x026c
> +#define RK3288_GRF_SOC_CON14 0x027c
> +#define RK3288_GRF_SOC_STATUS21 0x02d4
> +#define RK3288_GRF_IO_VSEL 0x0380
> +#define RK3288_GRF_SOC_CON15 0x03a4
> +
> +#define RK3399_GRF_SOC_CON9 0x6224
> +#define RK3399_GRF_SOC_CON21 0x6254
> +#define RK3399_GRF_SOC_CON22 0x6258
> +#define RK3399_GRF_SOC_CON23 0x625c
> +#define RK3399_GRF_SOC_CON24 0x6260
> +#define RK3399_GRF_SOC_CON25 0x6264
> +#define RK3399_GRF_SOC_STATUS1 0xe2a4
> +
> +#define CLOCK_LANE_HS_RX_CONTROL 0x34
> +#define LANE0_HS_RX_CONTROL 0x44
> +#define LANE1_HS_RX_CONTROL 0x54
> +#define LANE2_HS_RX_CONTROL 0x84
> +#define LANE3_HS_RX_CONTROL 0x94
> +#define HS_RX_DATA_LANES_THS_SETTLE_CONTROL 0x75
> +
> +/*
> + * CSI HOST
> + */
> +#define CSIHOST_PHY_TEST_CTRL0 0x30
> +#define CSIHOST_PHY_TEST_CTRL1 0x34
> +#define CSIHOST_PHY_SHUTDOWNZ 0x08
> +#define CSIHOST_DPHY_RSTZ 0x0c
> +
> +#define PHY_TESTEN_ADDR (0x1 << 16)
> +#define PHY_TESTEN_DATA (0x0 << 16)
> +#define PHY_TESTCLK (0x1 << 1)
> +#define PHY_TESTCLR (0x1 << 0)
> +#define THS_SETTLE_COUNTER_THRESHOLD 0x04
> +
> +#define HIWORD_UPDATE(val, mask, shift) \
> + ((val) << (shift) | (mask) << ((shift) + 16))
> +
> +enum mipi_dphy_sy_pads {
> + MIPI_DPHY_SY_PAD_SINK = 0,
> + MIPI_DPHY_SY_PAD_SOURCE,
> + MIPI_DPHY_SY_PADS_NUM,
> +};
> +
> +enum dphy_reg_id {
> + GRF_DPHY_RX0_TURNDISABLE = 0,
> + GRF_DPHY_RX0_FORCERXMODE,
> + GRF_DPHY_RX0_FORCETXSTOPMODE,
> + GRF_DPHY_RX0_ENABLE,
> + GRF_DPHY_RX0_TESTCLR,
> + GRF_DPHY_RX0_TESTCLK,
> + GRF_DPHY_RX0_TESTEN,
> + GRF_DPHY_RX0_TESTDIN,
> + GRF_DPHY_RX0_TURNREQUEST,
> + GRF_DPHY_RX0_TESTDOUT,
> + GRF_DPHY_TX0_TURNDISABLE,
> + GRF_DPHY_TX0_FORCERXMODE,
> + GRF_DPHY_TX0_FORCETXSTOPMODE,
> + GRF_DPHY_TX0_TURNREQUEST,
> + GRF_DPHY_TX1RX1_TURNDISABLE,
> + GRF_DPHY_TX1RX1_FORCERXMODE,
> + GRF_DPHY_TX1RX1_FORCETXSTOPMODE,
> + GRF_DPHY_TX1RX1_ENABLE,
> + GRF_DPHY_TX1RX1_MASTERSLAVEZ,
> + GRF_DPHY_TX1RX1_BASEDIR,
> + GRF_DPHY_TX1RX1_ENABLECLK,
> + GRF_DPHY_TX1RX1_TURNREQUEST,
> + GRF_DPHY_RX1_SRC_SEL,
> + /* rk3288 only */
> + GRF_CON_DISABLE_ISP,
> + GRF_CON_ISP_DPHY_SEL,
> + GRF_DSI_CSI_TESTBUS_SEL,
> + GRF_DVP_V18SEL,
> + /* below is for rk3399 only */
> + GRF_DPHY_RX0_CLK_INV_SEL,
> + GRF_DPHY_RX1_CLK_INV_SEL,
> +};
> +
> +struct dphy_reg {
> + u32 offset;
> + u32 mask;
> + u32 shift;
> +};
> +
> +#define PHY_REG(_offset, _width, _shift) \
> + { .offset = _offset, .mask = BIT(_width) - 1, .shift = _shift, }
> +
> +static const struct dphy_reg rk3399_grf_dphy_regs[] = {
> + [GRF_DPHY_RX0_TURNREQUEST] = PHY_REG(RK3399_GRF_SOC_CON9, 4, 0),
> + [GRF_DPHY_RX0_CLK_INV_SEL] = PHY_REG(RK3399_GRF_SOC_CON9, 1, 10),
> + [GRF_DPHY_RX1_CLK_INV_SEL] = PHY_REG(RK3399_GRF_SOC_CON9, 1, 11),
> + [GRF_DPHY_RX0_ENABLE] = PHY_REG(RK3399_GRF_SOC_CON21, 4, 0),
> + [GRF_DPHY_RX0_FORCERXMODE] = PHY_REG(RK3399_GRF_SOC_CON21, 4, 4),
> + [GRF_DPHY_RX0_FORCETXSTOPMODE] = PHY_REG(RK3399_GRF_SOC_CON21, 4, 8),
> + [GRF_DPHY_RX0_TURNDISABLE] = PHY_REG(RK3399_GRF_SOC_CON21, 4, 12),
> + [GRF_DPHY_TX0_FORCERXMODE] = PHY_REG(RK3399_GRF_SOC_CON22, 4, 0),
> + [GRF_DPHY_TX0_FORCETXSTOPMODE] = PHY_REG(RK3399_GRF_SOC_CON22, 4, 4),
> + [GRF_DPHY_TX0_TURNDISABLE] = PHY_REG(RK3399_GRF_SOC_CON22, 4, 8),
> + [GRF_DPHY_TX0_TURNREQUEST] = PHY_REG(RK3399_GRF_SOC_CON22, 4, 12),
> + [GRF_DPHY_TX1RX1_ENABLE] = PHY_REG(RK3399_GRF_SOC_CON23, 4, 0),
> + [GRF_DPHY_TX1RX1_FORCERXMODE] = PHY_REG(RK3399_GRF_SOC_CON23, 4, 4),
> + [GRF_DPHY_TX1RX1_FORCETXSTOPMODE] = PHY_REG(RK3399_GRF_SOC_CON23, 4, 8),
> + [GRF_DPHY_TX1RX1_TURNDISABLE] = PHY_REG(RK3399_GRF_SOC_CON23, 4, 12),
> + [GRF_DPHY_TX1RX1_TURNREQUEST] = PHY_REG(RK3399_GRF_SOC_CON24, 4, 0),
> + [GRF_DPHY_RX1_SRC_SEL] = PHY_REG(RK3399_GRF_SOC_CON24, 1, 4),
> + [GRF_DPHY_TX1RX1_BASEDIR] = PHY_REG(RK3399_GRF_SOC_CON24, 1, 5),
> + [GRF_DPHY_TX1RX1_ENABLECLK] = PHY_REG(RK3399_GRF_SOC_CON24, 1, 6),
> + [GRF_DPHY_TX1RX1_MASTERSLAVEZ] = PHY_REG(RK3399_GRF_SOC_CON24, 1, 7),
> + [GRF_DPHY_RX0_TESTDIN] = PHY_REG(RK3399_GRF_SOC_CON25, 8, 0),
> + [GRF_DPHY_RX0_TESTEN] = PHY_REG(RK3399_GRF_SOC_CON25, 1, 8),
> + [GRF_DPHY_RX0_TESTCLK] = PHY_REG(RK3399_GRF_SOC_CON25, 1, 9),
> + [GRF_DPHY_RX0_TESTCLR] = PHY_REG(RK3399_GRF_SOC_CON25, 1, 10),
> + [GRF_DPHY_RX0_TESTDOUT] = PHY_REG(RK3399_GRF_SOC_STATUS1, 8, 0),
> +};
> +
> +static const struct dphy_reg rk3288_grf_dphy_regs[] = {
> + [GRF_CON_DISABLE_ISP] = PHY_REG(RK3288_GRF_SOC_CON6, 1, 0),
> + [GRF_CON_ISP_DPHY_SEL] = PHY_REG(RK3288_GRF_SOC_CON6, 1, 1),
> + [GRF_DSI_CSI_TESTBUS_SEL] = PHY_REG(RK3288_GRF_SOC_CON6, 1, 14),
> + [GRF_DPHY_TX0_TURNDISABLE] = PHY_REG(RK3288_GRF_SOC_CON8, 4, 0),
> + [GRF_DPHY_TX0_FORCERXMODE] = PHY_REG(RK3288_GRF_SOC_CON8, 4, 4),
> + [GRF_DPHY_TX0_FORCETXSTOPMODE] = PHY_REG(RK3288_GRF_SOC_CON8, 4, 8),
> + [GRF_DPHY_TX1RX1_TURNDISABLE] = PHY_REG(RK3288_GRF_SOC_CON9, 4, 0),
> + [GRF_DPHY_TX1RX1_FORCERXMODE] = PHY_REG(RK3288_GRF_SOC_CON9, 4, 4),
> + [GRF_DPHY_TX1RX1_FORCETXSTOPMODE] = PHY_REG(RK3288_GRF_SOC_CON9, 4, 8),
> + [GRF_DPHY_TX1RX1_ENABLE] = PHY_REG(RK3288_GRF_SOC_CON9, 4, 12),
> + [GRF_DPHY_RX0_TURNDISABLE] = PHY_REG(RK3288_GRF_SOC_CON10, 4, 0),
> + [GRF_DPHY_RX0_FORCERXMODE] = PHY_REG(RK3288_GRF_SOC_CON10, 4, 4),
> + [GRF_DPHY_RX0_FORCETXSTOPMODE] = PHY_REG(RK3288_GRF_SOC_CON10, 4, 8),
> + [GRF_DPHY_RX0_ENABLE] = PHY_REG(RK3288_GRF_SOC_CON10, 4, 12),
> + [GRF_DPHY_RX0_TESTCLR] = PHY_REG(RK3288_GRF_SOC_CON14, 1, 0),
> + [GRF_DPHY_RX0_TESTCLK] = PHY_REG(RK3288_GRF_SOC_CON14, 1, 1),
> + [GRF_DPHY_RX0_TESTEN] = PHY_REG(RK3288_GRF_SOC_CON14, 1, 2),
> + [GRF_DPHY_RX0_TESTDIN] = PHY_REG(RK3288_GRF_SOC_CON14, 8, 3),
> + [GRF_DPHY_TX1RX1_ENABLECLK] = PHY_REG(RK3288_GRF_SOC_CON14, 1, 12),
> + [GRF_DPHY_RX1_SRC_SEL] = PHY_REG(RK3288_GRF_SOC_CON14, 1, 13),
> + [GRF_DPHY_TX1RX1_MASTERSLAVEZ] = PHY_REG(RK3288_GRF_SOC_CON14, 1, 14),
> + [GRF_DPHY_TX1RX1_BASEDIR] = PHY_REG(RK3288_GRF_SOC_CON14, 1, 15),
> + [GRF_DPHY_RX0_TURNREQUEST] = PHY_REG(RK3288_GRF_SOC_CON15, 4, 0),
> + [GRF_DPHY_TX1RX1_TURNREQUEST] = PHY_REG(RK3288_GRF_SOC_CON15, 4, 4),
> + [GRF_DPHY_TX0_TURNREQUEST] = PHY_REG(RK3288_GRF_SOC_CON15, 3, 8),
> + [GRF_DVP_V18SEL] = PHY_REG(RK3288_GRF_IO_VSEL, 1, 1),
> + [GRF_DPHY_RX0_TESTDOUT] = PHY_REG(RK3288_GRF_SOC_STATUS21, 8, 0),
> +};
> +
> +struct hsfreq_range {
> + u32 range_h;
> + u8 cfg_bit;
> +};
> +
> +struct mipidphy_priv;
> +
> +struct dphy_drv_data {
> + const char * const *clks;
> + int num_clks;
> + const struct hsfreq_range *hsfreq_ranges;
> + int num_hsfreq_ranges;
> + const struct dphy_reg *regs;
> +};
> +
> +struct sensor_async_subdev {
> + struct v4l2_async_subdev asd;
> + struct v4l2_mbus_config mbus;
> + int lanes;
> +};
> +
> +#define MAX_DPHY_CLK 8
> +#define MAX_DPHY_SENSORS 2
> +
> +struct mipidphy_sensor {
> + struct v4l2_subdev *sd;
> + struct v4l2_mbus_config mbus;
> + int lanes;
> +};
> +
> +struct mipidphy_priv {
> + struct device *dev;
> + struct regmap *regmap_grf;
> + const struct dphy_reg *grf_regs;
> + struct clk *clks[MAX_DPHY_CLK];
> + const struct dphy_drv_data *drv_data;
> + u64 data_rate_mbps;
> + struct v4l2_async_notifier notifier;
> + struct v4l2_subdev sd;
> + struct media_pad pads[MIPI_DPHY_SY_PADS_NUM];
> + struct mipidphy_sensor sensors[MAX_DPHY_SENSORS];

Should we really hardcode the maximum number of sensors ? Wouldn't it be
better to allocate this dynamically ?

> + int num_sensors;
> + bool is_streaming;
> + void __iomem *txrx_base_addr;
> + int (*stream_on)(struct mipidphy_priv *priv, struct v4l2_subdev *sd);
> +};
> +
> +static inline struct mipidphy_priv *to_dphy_priv(struct v4l2_subdev *subdev)
> +{
> + return container_of(subdev, struct mipidphy_priv, sd);
> +}
> +
> +static inline void write_grf_reg(struct mipidphy_priv *priv,
> + int index, u8 value)
> +{
> + const struct dphy_reg *reg = &priv->grf_regs[index];
> + unsigned int val = HIWORD_UPDATE(value, reg->mask, reg->shift);
> +
> + WARN_ON(!reg->offset);
> + regmap_write(priv->regmap_grf, reg->offset, val);
> +}
> +
> +static void mipidphy0_wr_reg(struct mipidphy_priv *priv,
> + u8 test_code, u8 test_data)
> +{
> + /*
> + * With the falling edge on TESTCLK, the TESTDIN[7:0] signal content
> + * is latched internally as the current test code. Test data is
> + * programmed internally by rising edge on TESTCLK.
> + */
> + write_grf_reg(priv, GRF_DPHY_RX0_TESTCLK, 1);
> + write_grf_reg(priv, GRF_DPHY_RX0_TESTDIN, test_code);
> + write_grf_reg(priv, GRF_DPHY_RX0_TESTEN, 1);
> + write_grf_reg(priv, GRF_DPHY_RX0_TESTCLK, 0);
> + write_grf_reg(priv, GRF_DPHY_RX0_TESTEN, 0);
> + write_grf_reg(priv, GRF_DPHY_RX0_TESTDIN, test_data);
> + write_grf_reg(priv, GRF_DPHY_RX0_TESTCLK, 1);
> +}
> +
> +static void mipidphy1_wr_reg(struct mipidphy_priv *priv, unsigned char addr,
> + unsigned char data)
> +{
> + /*
> + * TESTEN =1,TESTDIN=addr
> + * TESTCLK=0
> + * TESTEN =0,TESTDIN=data
> + * TESTCLK=1
> + */
> + writel((PHY_TESTEN_ADDR | addr),
> + priv->txrx_base_addr + CSIHOST_PHY_TEST_CTRL1);
> + writel(0x00, priv->txrx_base_addr + CSIHOST_PHY_TEST_CTRL0);
> + writel((PHY_TESTEN_DATA | data),
> + priv->txrx_base_addr + CSIHOST_PHY_TEST_CTRL1);
> + writel(PHY_TESTCLK, priv->txrx_base_addr + CSIHOST_PHY_TEST_CTRL0);
> +}
> +
> +static struct v4l2_subdev *get_remote_sensor(struct v4l2_subdev *sd)
> +{
> + struct media_pad *local, *remote;
> + struct media_entity *sensor_me;
> +
> + local = &sd->entity.pads[MIPI_DPHY_SY_PAD_SINK];
> + remote = media_entity_remote_pad(local);
> + if (!remote) {
> + v4l2_warn(sd, "No link between dphy and sensor\n");
> + return NULL;
> + }
> +
> + sensor_me = media_entity_remote_pad(local)->entity;
> + return media_entity_to_v4l2_subdev(sensor_me);

You could call this at the beginning of mipidphy_s_stream_start() and
pass the sensor pointer to mipidphy_get_sensor_data_rate() and the
.stream_on() operations to avoid multiple costly lookups, or possibly
cache it in the mipidphy_priv structure (in that case I'd reset it to
NULL at stream off time).

> +}
> +
> +static struct mipidphy_sensor *sd_to_sensor(struct mipidphy_priv *priv,
> + struct v4l2_subdev *sd)
> +{
> + int i;
> +
> + for (i = 0; i < priv->num_sensors; ++i)
> + if (priv->sensors[i].sd == sd)
> + return &priv->sensors[i];
> +
> + return NULL;
> +}
> +
> +static int mipidphy_get_sensor_data_rate(struct v4l2_subdev *sd)
> +{
> + struct mipidphy_priv *priv = to_dphy_priv(sd);
> + struct v4l2_subdev *sensor_sd = get_remote_sensor(sd);
> + struct v4l2_ctrl *link_freq;
> + struct v4l2_querymenu qm = { .id = V4L2_CID_LINK_FREQ, };
> + int ret;
> +
> + link_freq = v4l2_ctrl_find(sensor_sd->ctrl_handler, V4L2_CID_LINK_FREQ);

The correct control for this is V4L2_CID_PIXEL_RATE. You will have to
divide it by the number of lanes to get the data rate per lane, but
there will be no need to multiply it by 2 as below.

> + if (!link_freq) {
> + v4l2_warn(sd, "No pixel rate control in subdev\n");
> + return -EPIPE;
> + }
> +
> + qm.index = v4l2_ctrl_g_ctrl(link_freq);
> + ret = v4l2_querymenu(sensor_sd->ctrl_handler, &qm);
> + if (ret < 0) {
> + v4l2_err(sd, "Failed to get menu item\n");
> + return ret;
> + }
> +
> + if (!qm.value) {
> + v4l2_err(sd, "Invalid link_freq\n");
> + return -EINVAL;
> + }
> + priv->data_rate_mbps = qm.value * 2;
> + do_div(priv->data_rate_mbps, 1000 * 1000);
> +
> + return 0;
> +}
> +
> +static int mipidphy_s_stream_start(struct v4l2_subdev *sd)
> +{
> + struct mipidphy_priv *priv = to_dphy_priv(sd);
> + int ret = 0;
> +
> + if (priv->is_streaming)
> + return 0;
> +
> + ret = mipidphy_get_sensor_data_rate(sd);
> + if (ret < 0)
> + return ret;
> +
> + priv->stream_on(priv, sd);
> +
> + priv->is_streaming = true;
> +
> + return 0;
> +}
> +
> +static int mipidphy_s_stream_stop(struct v4l2_subdev *sd)
> +{
> + struct mipidphy_priv *priv = to_dphy_priv(sd);
> +
> + priv->is_streaming = false;
> +
> + return 0;
> +}
> +
> +static int mipidphy_s_stream(struct v4l2_subdev *sd, int on)
> +{
> + if (on)
> + return mipidphy_s_stream_start(sd);
> + else
> + return mipidphy_s_stream_stop(sd);
> +}
> +
> +static int mipidphy_g_mbus_config(struct v4l2_subdev *sd,
> + struct v4l2_mbus_config *config)
> +{
> + struct mipidphy_priv *priv = to_dphy_priv(sd);
> + struct v4l2_subdev *sensor_sd = get_remote_sensor(sd);
> + struct mipidphy_sensor *sensor = sd_to_sensor(priv, sensor_sd);
> +
> + *config = sensor->mbus;
> +
> + return 0;
> +}

This seems like a hack :-(

> +
> +static int mipidphy_s_power(struct v4l2_subdev *sd, int on)
> +{
> + struct mipidphy_priv *priv = to_dphy_priv(sd);
> +
> + if (on)
> + return pm_runtime_get_sync(priv->dev);
> + else
> + return pm_runtime_put(priv->dev);
> +}
> +
> +static int mipidphy_runtime_suspend(struct device *dev)
> +{
> + struct media_entity *me = dev_get_drvdata(dev);
> + struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(me);
> + struct mipidphy_priv *priv = to_dphy_priv(sd);
> + int i, num_clks;
> +
> + num_clks = priv->drv_data->num_clks;
> + for (i = num_clks - 1; i >= 0; i--)
> + clk_disable_unprepare(priv->clks[i]);
> +
> + return 0;
> +}
> +
> +static int mipidphy_runtime_resume(struct device *dev)
> +{
> + struct media_entity *me = dev_get_drvdata(dev);
> + struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(me);
> + struct mipidphy_priv *priv = to_dphy_priv(sd);
> + int i, num_clks, ret;
> +
> + num_clks = priv->drv_data->num_clks;
> + for (i = 0; i < num_clks; i++) {
> + ret = clk_prepare_enable(priv->clks[i]);
> + if (ret < 0)
> + goto err;
> + }
> +
> + return 0;
> +err:
> + while (--i >= 0)
> + clk_disable_unprepare(priv->clks[i]);
> + return ret;
> +}
> +
> +/* dphy accepts all fmt/size from sensor */
> +static int mipidphy_get_set_fmt(struct v4l2_subdev *sd,
> + struct v4l2_subdev_pad_config *cfg,
> + struct v4l2_subdev_format *fmt)
> +{
> + struct v4l2_subdev *sensor = get_remote_sensor(sd);
> +
> + /*
> + * Do not allow format changes and just relay whatever
> + * set currently in the sensor.
> + */
> + return v4l2_subdev_call(sensor, pad, get_fmt, NULL, fmt);

It's userspace responsibility to propagate formats through the pipeline
when using the MC API, you shouldn't access the format of the source
subdev in this driver.

> +}
> +
> +static const struct v4l2_subdev_pad_ops mipidphy_subdev_pad_ops = {
> + .set_fmt = mipidphy_get_set_fmt,
> + .get_fmt = mipidphy_get_set_fmt,
> +};
> +
> +static const struct v4l2_subdev_core_ops mipidphy_core_ops = {
> + .s_power = mipidphy_s_power,
> +};
> +
> +static const struct v4l2_subdev_video_ops mipidphy_video_ops = {
> + .g_mbus_config = mipidphy_g_mbus_config,
> + .s_stream = mipidphy_s_stream,
> +};
> +
> +static const struct v4l2_subdev_ops mipidphy_subdev_ops = {
> + .core = &mipidphy_core_ops,
> + .video = &mipidphy_video_ops,
> + .pad = &mipidphy_subdev_pad_ops,
> +};
> +
> +/* These tables must be sorted by .range_h ascending. */
> +static const struct hsfreq_range rk3288_mipidphy_hsfreq_ranges[] = {
> + { 89, 0x00}, { 99, 0x10}, { 109, 0x20}, { 129, 0x01},
> + { 139, 0x11}, { 149, 0x21}, { 169, 0x02}, { 179, 0x12},
> + { 199, 0x22}, { 219, 0x03}, { 239, 0x13}, { 249, 0x23},
> + { 269, 0x04}, { 299, 0x14}, { 329, 0x05}, { 359, 0x15},
> + { 399, 0x25}, { 449, 0x06}, { 499, 0x16}, { 549, 0x07},
> + { 599, 0x17}, { 649, 0x08}, { 699, 0x18}, { 749, 0x09},
> + { 799, 0x19}, { 849, 0x29}, { 899, 0x39}, { 949, 0x0a},
> + { 999, 0x1a}
> +};
> +
> +static const struct hsfreq_range rk3399_mipidphy_hsfreq_ranges[] = {
> + { 89, 0x00}, { 99, 0x10}, { 109, 0x20}, { 129, 0x01},
> + { 139, 0x11}, { 149, 0x21}, { 169, 0x02}, { 179, 0x12},
> + { 199, 0x22}, { 219, 0x03}, { 239, 0x13}, { 249, 0x23},
> + { 269, 0x04}, { 299, 0x14}, { 329, 0x05}, { 359, 0x15},
> + { 399, 0x25}, { 449, 0x06}, { 499, 0x16}, { 549, 0x07},
> + { 599, 0x17}, { 649, 0x08}, { 699, 0x18}, { 749, 0x09},
> + { 799, 0x19}, { 849, 0x29}, { 899, 0x39}, { 949, 0x0a},
> + { 999, 0x1a}, {1049, 0x2a}, {1099, 0x3a}, {1149, 0x0b},
> + {1199, 0x1b}, {1249, 0x2b}, {1299, 0x3b}, {1349, 0x0c},
> + {1399, 0x1c}, {1449, 0x2c}, {1500, 0x3c}
> +};
> +
> +static const char * const rk3399_mipidphy_clks[] = {
> + "dphy-ref",
> + "dphy-cfg",
> + "grf",
> +};
> +
> +static const char * const rk3288_mipidphy_clks[] = {
> + "dphy-ref",
> + "pclk",
> +};
> +
> +static int mipidphy_rx_stream_on(struct mipidphy_priv *priv,
> + struct v4l2_subdev *sd)
> +{
> + struct v4l2_subdev *sensor_sd = get_remote_sensor(sd);
> + struct mipidphy_sensor *sensor = sd_to_sensor(priv, sensor_sd);
> + const struct dphy_drv_data *drv_data = priv->drv_data;
> + const struct hsfreq_range *hsfreq_ranges = drv_data->hsfreq_ranges;
> + int num_hsfreq_ranges = drv_data->num_hsfreq_ranges;
> + int i, hsfreq = 0;
> +
> + for (i = 0; i < num_hsfreq_ranges; i++) {
> + if (hsfreq_ranges[i].range_h >= priv->data_rate_mbps) {
> + hsfreq = hsfreq_ranges[i].cfg_bit;
> + break;
> + }
> + }
> + write_grf_reg(priv, GRF_CON_ISP_DPHY_SEL, 0);
> + write_grf_reg(priv, GRF_DPHY_RX0_FORCERXMODE, 0);
> + write_grf_reg(priv, GRF_DPHY_RX0_FORCETXSTOPMODE, 0);
> + /* Disable lan turn around, which is ignored in receive mode */
> + write_grf_reg(priv, GRF_DPHY_RX0_TURNREQUEST, 0);
> + write_grf_reg(priv, GRF_DPHY_RX0_TURNDISABLE, 0xf);
> +
> + write_grf_reg(priv, GRF_DPHY_RX0_ENABLE, GENMASK(sensor->lanes - 1, 0));
> +
> + /* dphy start */
> + write_grf_reg(priv, GRF_DPHY_RX0_TESTCLK, 1);
> + write_grf_reg(priv, GRF_DPHY_RX0_TESTCLR, 1);
> + usleep_range(100, 150);
> + write_grf_reg(priv, GRF_DPHY_RX0_TESTCLR, 0);
> + usleep_range(100, 150);
> +
> + /* set clock lane */
> + /* HS hsfreq_range & lane 0 settle bypass */
> + mipidphy0_wr_reg(priv, CLOCK_LANE_HS_RX_CONTROL, 0);
> + /* HS RX Control of lane0 */
> + mipidphy0_wr_reg(priv, LANE0_HS_RX_CONTROL, hsfreq << 1);
> + /* HS RX Control of lane1 */
> + mipidphy0_wr_reg(priv, LANE1_HS_RX_CONTROL, 0);
> + /* HS RX Control of lane2 */
> + mipidphy0_wr_reg(priv, LANE2_HS_RX_CONTROL, 0);
> + /* HS RX Control of lane3 */
> + mipidphy0_wr_reg(priv, LANE3_HS_RX_CONTROL, 0);
> + /* HS RX Data Lanes Settle State Time Control */
> + mipidphy0_wr_reg(priv, HS_RX_DATA_LANES_THS_SETTLE_CONTROL,
> + THS_SETTLE_COUNTER_THRESHOLD);
> +
> + /* Normal operation */
> + mipidphy0_wr_reg(priv, 0x0, 0);
> +
> + return 0;
> +}
> +
> +static int mipidphy_txrx_stream_on(struct mipidphy_priv *priv,
> + struct v4l2_subdev *sd)
> +{
> + struct v4l2_subdev *sensor_sd = get_remote_sensor(sd);
> + struct mipidphy_sensor *sensor = sd_to_sensor(priv, sensor_sd);
> + const struct dphy_drv_data *drv_data = priv->drv_data;
> + const struct hsfreq_range *hsfreq_ranges = drv_data->hsfreq_ranges;
> + int num_hsfreq_ranges = drv_data->num_hsfreq_ranges;
> + int i, hsfreq = 0;
> +
> + for (i = 0; i < num_hsfreq_ranges; i++) {
> + if (hsfreq_ranges[i].range_h >= priv->data_rate_mbps) {
> + hsfreq = hsfreq_ranges[i].cfg_bit;
> + break;
> + }
> + }
> + write_grf_reg(priv, GRF_CON_ISP_DPHY_SEL, 1);
> + write_grf_reg(priv, GRF_DSI_CSI_TESTBUS_SEL, 1);
> + write_grf_reg(priv, GRF_DPHY_RX1_SRC_SEL, 1);
> + write_grf_reg(priv, GRF_DPHY_TX1RX1_MASTERSLAVEZ, 0);
> + write_grf_reg(priv, GRF_DPHY_TX1RX1_BASEDIR, 1);
> + /* Disable lan turn around, which is ignored in receive mode */
> + write_grf_reg(priv, GRF_DPHY_TX1RX1_FORCERXMODE, 0);
> + write_grf_reg(priv, GRF_DPHY_TX1RX1_FORCETXSTOPMODE, 0);
> + write_grf_reg(priv, GRF_DPHY_TX1RX1_TURNREQUEST, 0);
> + write_grf_reg(priv, GRF_DPHY_TX1RX1_TURNDISABLE, 0xf);
> + write_grf_reg(priv, GRF_DPHY_TX1RX1_ENABLE,
> + GENMASK(sensor->lanes - 1, 0));
> + /* dphy start */
> + writel(0, priv->txrx_base_addr + CSIHOST_PHY_SHUTDOWNZ);
> + writel(0, priv->txrx_base_addr + CSIHOST_DPHY_RSTZ);
> + writel(PHY_TESTCLK, priv->txrx_base_addr + CSIHOST_PHY_TEST_CTRL0);
> + writel(PHY_TESTCLR, priv->txrx_base_addr + CSIHOST_PHY_TEST_CTRL0);
> + usleep_range(100, 150);
> + writel(PHY_TESTCLK, priv->txrx_base_addr + CSIHOST_PHY_TEST_CTRL0);
> + usleep_range(100, 150);
> +
> + /* set clock lane */
> + mipidphy1_wr_reg(priv, CLOCK_LANE_HS_RX_CONTROL, 0);
> + mipidphy1_wr_reg(priv, LANE0_HS_RX_CONTROL, hsfreq << 1);
> + mipidphy1_wr_reg(priv, LANE1_HS_RX_CONTROL, 0);
> + mipidphy1_wr_reg(priv, LANE2_HS_RX_CONTROL, 0);
> + mipidphy1_wr_reg(priv, LANE3_HS_RX_CONTROL, 0);
> + /* HS RX Data Lanes Settle State Time Control */
> + mipidphy1_wr_reg(priv, HS_RX_DATA_LANES_THS_SETTLE_CONTROL,
> + THS_SETTLE_COUNTER_THRESHOLD);
> +
> + /* Normal operation */
> + mipidphy1_wr_reg(priv, 0x0, 0);
> +
> + return 0;
> +}
> +
> +static const struct dphy_drv_data rk3288_mipidphy_drv_data = {
> + .clks = rk3288_mipidphy_clks,
> + .num_clks = ARRAY_SIZE(rk3288_mipidphy_clks),
> + .hsfreq_ranges = rk3288_mipidphy_hsfreq_ranges,
> + .num_hsfreq_ranges = ARRAY_SIZE(rk3288_mipidphy_hsfreq_ranges),
> + .regs = rk3288_grf_dphy_regs,
> +};
> +
> +static const struct dphy_drv_data rk3399_mipidphy_drv_data = {
> + .clks = rk3399_mipidphy_clks,
> + .num_clks = ARRAY_SIZE(rk3399_mipidphy_clks),
> + .hsfreq_ranges = rk3399_mipidphy_hsfreq_ranges,
> + .num_hsfreq_ranges = ARRAY_SIZE(rk3399_mipidphy_hsfreq_ranges),
> + .regs = rk3399_grf_dphy_regs,
> +};
> +
> +static const struct of_device_id rockchip_mipidphy_match_id[] = {
> + {
> + .compatible = "rockchip,rk3399-mipi-dphy",
> + .data = &rk3399_mipidphy_drv_data,
> + },
> + {
> + .compatible = "rockchip,rk3288-mipi-dphy",
> + .data = &rk3288_mipidphy_drv_data,
> + },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, rockchip_mipidphy_match_id);

You can mode this just above the probe function to group it with the
code that uses it.

> +
> +/* The .bound() notifier callback when a match is found */
> +static int
> +rockchip_mipidphy_notifier_bound(struct v4l2_async_notifier *notifier,
> + struct v4l2_subdev *sd,
> + struct v4l2_async_subdev *asd)
> +{
> + struct mipidphy_priv *priv = container_of(notifier,
> + struct mipidphy_priv,
> + notifier);
> + struct sensor_async_subdev *s_asd = container_of(asd,
> + struct sensor_async_subdev, asd);
> + struct mipidphy_sensor *sensor;
> + unsigned int pad, ret;
> +
> + if (priv->num_sensors == ARRAY_SIZE(priv->sensors))
> + return -EBUSY;
> +
> + sensor = &priv->sensors[priv->num_sensors++];
> + sensor->lanes = s_asd->lanes;
> + sensor->mbus = s_asd->mbus;
> + sensor->sd = sd;
> +
> + for (pad = 0; pad < sensor->sd->entity.num_pads; pad++)
> + if (sensor->sd->entity.pads[pad].flags
> + & MEDIA_PAD_FL_SOURCE)
> + break;
> +
> + if (pad == sensor->sd->entity.num_pads) {
> + dev_err(priv->dev,
> + "failed to find src pad for %s\n",
> + sensor->sd->name);
> +
> + return -ENXIO;
> + }
> +
> + ret = media_create_pad_link(
> + &sensor->sd->entity, pad,
> + &priv->sd.entity, MIPI_DPHY_SY_PAD_SINK,
> + priv->num_sensors != 1 ? 0 : MEDIA_LNK_FL_ENABLED);
> + if (ret) {
> + dev_err(priv->dev,
> + "failed to create link for %s\n",
> + sensor->sd->name);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +/* The .unbind callback */
> +static void
> +rockchip_mipidphy_notifier_unbind(struct v4l2_async_notifier *notifier,
> + struct v4l2_subdev *sd,
> + struct v4l2_async_subdev *asd)
> +{
> + struct mipidphy_priv *priv = container_of(notifier,
> + struct mipidphy_priv,
> + notifier);
> + struct mipidphy_sensor *sensor = sd_to_sensor(priv, sd);
> +
> + sensor->sd = NULL;
> +}
> +
> +static const struct
> +v4l2_async_notifier_operations rockchip_mipidphy_async_ops = {
> + .bound = rockchip_mipidphy_notifier_bound,
> + .unbind = rockchip_mipidphy_notifier_unbind,
> +};
> +
> +static int rockchip_mipidphy_fwnode_parse(struct device *dev,
> + struct v4l2_fwnode_endpoint *vep,
> + struct v4l2_async_subdev *asd)
> +{
> + struct sensor_async_subdev *s_asd =
> + container_of(asd, struct sensor_async_subdev, asd);
> + struct v4l2_mbus_config *config = &s_asd->mbus;
> +
> + if (vep->bus_type != V4L2_MBUS_CSI2) {
> + dev_err(dev, "Only CSI2 bus type is currently supported\n");
> + return -EINVAL;
> + }
> +
> + if (vep->base.port != 0) {
> + dev_err(dev, "The PHY has only port 0\n");
> + return -EINVAL;
> + }
> +
> + config->type = V4L2_MBUS_CSI2;
> + config->flags = vep->bus.mipi_csi2.flags;
> + s_asd->lanes = vep->bus.mipi_csi2.num_data_lanes;
> +
> + switch (vep->bus.mipi_csi2.num_data_lanes) {
> + case 1:
> + config->flags |= V4L2_MBUS_CSI2_1_LANE;
> + break;
> + case 2:
> + config->flags |= V4L2_MBUS_CSI2_2_LANE;
> + break;
> + case 3:
> + config->flags |= V4L2_MBUS_CSI2_3_LANE;
> + break;
> + case 4:
> + config->flags |= V4L2_MBUS_CSI2_4_LANE;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static int rockchip_mipidphy_media_init(struct mipidphy_priv *priv)
> +{
> + int ret;
> +
> + priv->pads[MIPI_DPHY_SY_PAD_SOURCE].flags =
> + MEDIA_PAD_FL_SOURCE | MEDIA_PAD_FL_MUST_CONNECT;
> + priv->pads[MIPI_DPHY_SY_PAD_SINK].flags =
> + MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT;
> +
> + ret = media_entity_pads_init(&priv->sd.entity,
> + MIPI_DPHY_SY_PADS_NUM, priv->pads);
> + if (ret < 0)
> + return ret;
> +
> + ret = v4l2_async_notifier_parse_fwnode_endpoints_by_port(
> + priv->dev, &priv->notifier,
> + sizeof(struct sensor_async_subdev), 0,
> + rockchip_mipidphy_fwnode_parse);
> + if (ret < 0)
> + return ret;
> +
> + if (!priv->notifier.num_subdevs)
> + return -ENODEV; /* no endpoint */
> +
> + priv->sd.subdev_notifier = &priv->notifier;
> + priv->notifier.ops = &rockchip_mipidphy_async_ops;
> + ret = v4l2_async_subdev_notifier_register(&priv->sd, &priv->notifier);
> + if (ret) {
> + dev_err(priv->dev,
> + "failed to register async notifier : %d\n", ret);
> + v4l2_async_notifier_cleanup(&priv->notifier);
> + return ret;
> + }
> +
> + return v4l2_async_register_subdev(&priv->sd);
> +}
> +
> +static int rockchip_mipidphy_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct v4l2_subdev *sd;
> + struct mipidphy_priv *priv;
> + struct regmap *grf;
> + struct resource *res;
> + const struct of_device_id *of_id;
> + const struct dphy_drv_data *drv_data;
> + int i, ret;
> +
> + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> + priv->dev = dev;
> +
> + of_id = of_match_device(rockchip_mipidphy_match_id, dev);
> + if (!of_id)
> + return -EINVAL;
> +
> + grf = syscon_node_to_regmap(dev->parent->of_node);
> + if (IS_ERR(grf)) {
> + grf = syscon_regmap_lookup_by_phandle(dev->of_node,
> + "rockchip,grf");
> + if (IS_ERR(grf)) {
> + dev_err(dev, "Can't find GRF syscon\n");
> + return -ENODEV;
> + }
> + }
> + priv->regmap_grf = grf;
> +
> + drv_data = of_id->data;
> + for (i = 0; i < drv_data->num_clks; i++) {
> + priv->clks[i] = devm_clk_get(dev, drv_data->clks[i]);
> +
> + if (IS_ERR(priv->clks[i])) {
> + dev_err(dev, "Failed to get %s\n", drv_data->clks[i]);
> + return PTR_ERR(priv->clks[i]);
> + }
> + }
> +
> + priv->grf_regs = drv_data->regs;
> + priv->drv_data = drv_data;
> + priv->stream_on = mipidphy_txrx_stream_on;
> + priv->txrx_base_addr = NULL;
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + priv->txrx_base_addr = devm_ioremap_resource(dev, res);

This will result in an error being printed to the kernel log if res is
NULL. The following (untested) code should fix it.

res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res) {
priv->txrx_base_addr = devm_ioremap_resource(dev, res);
if (IS_ERR(priv->txrx_base_addr))
return PTR_ERR(priv->txrx_base_addr);

priv->stream_on = mipidphy_txrx_stream_on;
} else {
priv->txrx_base_addr = NULL;
priv->stream_on = mipidphy_rx_stream_on;
}

Furthermore, txrx_base_addr seems to be used to access the CSIHOST
registers, part of the CSI-2 receiver (CSI host in the system connection
description of the RK3288 datasheet, in the MIPI CSI PHY section), not
the PHY itself. I'm afraid you'll have to redesign this to split the
code between those two components. One option would be to have a CSI
host DT node with a reg resource for the CSIHOST registers, modeled as a
V4L2 subdev, and pointing to the DPHY using a phy-handle property. In
the rkisp1 driver, I would then extract the CSI-2 receiver code to a
separate subdev, and handle the PHY from that subdev, also with a
phy-handle property in the rkisp1 DT node.

> + if (IS_ERR(priv->txrx_base_addr))
> + priv->stream_on = mipidphy_rx_stream_on;
> +
> + sd = &priv->sd;
> + v4l2_subdev_init(sd, &mipidphy_subdev_ops);
> + sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> + snprintf(sd->name, sizeof(sd->name), "rockchip-sy-mipi-dphy");
> + sd->dev = dev;
> +
> + platform_set_drvdata(pdev, &sd->entity);
> +
> + ret = rockchip_mipidphy_media_init(priv);
> + if (ret < 0)
> + return ret;
> +
> + pm_runtime_enable(&pdev->dev);
> +
> + return 0;
> +}
> +
> +static int rockchip_mipidphy_remove(struct platform_device *pdev)
> +{
> + struct media_entity *me = platform_get_drvdata(pdev);
> + struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(me);
> +
> + media_entity_cleanup(&sd->entity);
> +
> + pm_runtime_disable(&pdev->dev);
> +
> + return 0;
> +}
> +
> +static const struct dev_pm_ops rockchip_mipidphy_pm_ops = {
> + SET_RUNTIME_PM_OPS(mipidphy_runtime_suspend,
> + mipidphy_runtime_resume, NULL)
> +};
> +
> +static struct platform_driver rockchip_isp_mipidphy_driver = {
> + .probe = rockchip_mipidphy_probe,
> + .remove = rockchip_mipidphy_remove,
> + .driver = {
> + .name = "rockchip-sy-mipi-dphy",
> + .pm = &rockchip_mipidphy_pm_ops,
> + .of_match_table = rockchip_mipidphy_match_id,

Too much indentation.

> + },
> +};
> +
> +module_platform_driver(rockchip_isp_mipidphy_driver);

dev.c also has a module_platform_driver(). As both are compiled in the
same module, this results in a link error when compiling the drivers as
a module. I would recommend separating it into two modules to fix this.

> +MODULE_AUTHOR("Rockchip Camera/ISP team");
> +MODULE_DESCRIPTION("Rockchip MIPI DPHY driver");
> +MODULE_LICENSE("Dual BSD/GPL");
> diff --git a/drivers/media/platform/rockchip/isp1/mipi_dphy_sy.h b/drivers/media/platform/rockchip/isp1/mipi_dphy_sy.h
> new file mode 100644
> index 000000000000..c558791064a2
> --- /dev/null
> +++ b/drivers/media/platform/rockchip/isp1/mipi_dphy_sy.h
> @@ -0,0 +1,15 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Rockchip MIPI Synopsys DPHY driver
> + *
> + * Copyright (C) 2017 Fuzhou Rockchip Electronics Co., Ltd.
> + */
> +
> +#ifndef __MIPI_DPHY_SY_H__
> +#define __MIPI_DPHY_SY_H__
> +
> +#include <media/v4l2-subdev.h>
> +
> +void rkisp1_set_mipi_dphy_sy_lanes(struct v4l2_subdev *dphy, int lanes);

This function doesn't seem to be used or defined anywhere, you can drop
this file.

> +
> +#endif /* __RKISP1_MIPI_DPHY_SY_H__ */

--
Regards,

Laurent Pinchart

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