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References: <20171124023706.5702-1-jacob-chen@iotwrt.com> <20171124023706.5702-5-jacob-chen@iotwrt.com>
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From:   Jacob Chen <jacob-chen@iotwrt.com>
Date:   Wed, 29 Nov 2017 16:38:44 +0800
Message-ID: <CAFLEztTLB8UJUnCOKU_y9wj=rAC34ZuGa=3-Ph-1D-n4S6mUkw@mail.gmail.com>
Subject: Re: [PATCH v2 04/11] media: rkisp1: add Rockchip MIPI Synopsys DPHY driver
To:     Jose Abreu <Jose.Abreu@synopsys.com>
Cc:     Hans Verkuil <hverkuil@xs4all.nl>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@lists.infradead.org>,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Linux Media Mailing List <linux-media@vger.kernel.org>,
        Sakari Ailus <sakari.ailus@linux.intel.com>,
        Hans Verkuil <hans.verkuil@cisco.com>,
        Tomasz Figa <tfiga@chromium.org>,
        Shunqian Zheng <zhengsq@rock-chips.com>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        =?UTF-8?B?6ZKf5Lul5bSH?= <zyc@rock-chips.com>,
        Eddie Cai <eddie.cai.linux@gmail.com>,
        Jeffy Chen <jeffy.chen@rock-chips.com>,
        Allon Huang <allon.huang@rock-chips.com>,
        devicetree@vger.kernel.org, Heiko Stuebner <heiko@sntech.de>,
        robh+dt@kernel.org, Joao Pinto <Joao.Pinto@synopsys.com>,
        Luis de Oliveira <Luis.Oliveira@synopsys.com>
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Hi Hans,

2017-11-27 22:15 GMT+08:00 Jose Abreu <Jose.Abreu@synopsys.com>:
> ++ Joao, ++ Luis
>
> Hi Hans,
>
> We will take a look into this. Thanks for pointing this out!
>
> Best Regards,
> Jose Miguel Abreu
>
> On 27-11-2017 12:01, Hans Verkuil wrote:
>> I'm CC-ing Jose Abreu from Synopsys to this. Jose, can you or a colleague take
>> a look at this as well?
>>
>> Jacob, I have some high-level questions first:
>>
>> 1) to what extend is this code rockchip-specific as opposed to be more synopsys-generic?

See below.

>>
>> 2) I don't quite see how this works when there are two sensors. Is only one active at a
>>    time? Or are they multiplexed somehow?
>>

For one mipi-rx-phy and one isp, only one sensor is active at a
time(selected by enabled media-link).
For example, a tablet with a front sensor and a rear sensor.


>> 3) Same as for the previous patch: some more comments would be welcome.
>>
>> On 11/24/2017 03:36 AM, Jacob Chen wrote:
>>> From: Jacob Chen <jacob2.chen@rock-chips.com>
>>>
>>> This commit adds a subdev driver for Rockchip MIPI Synopsys DPHY driver.
>>>
>>> The phy driver is kind of independent compare to the other parts, but i'd like
>>> to keep it in rkisp1 driver, unless people want to generalize it
>>>
>>> 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>
>>> ---
>>>  drivers/media/platform/rockchip/isp1/Makefile      |   1 +
>>>  .../media/platform/rockchip/isp1/mipi_dphy_sy.c    | 805 +++++++++++++++++++++
>>>  2 files changed, 806 insertions(+)
>>>  create mode 100644 drivers/media/platform/rockchip/isp1/mipi_dphy_sy.c
>>>
>>> diff --git a/drivers/media/platform/rockchip/isp1/Makefile b/drivers/media/platform/rockchip/isp1/Makefile
>>> index 8f52f959398e..18af64853734 100644
>>> --- a/drivers/media/platform/rockchip/isp1/Makefile
>>> +++ b/drivers/media/platform/rockchip/isp1/Makefile
>>> @@ -4,4 +4,5 @@ video_rkisp1-objs       +=   rkisp1.o \
>>>                              regs.o \
>>>                              isp_stats.o \
>>>                              isp_params.o \
>>> +                            mipi_dphy_sy.o \
>>>                              capture.o
>>> 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..56deff2be6fd
>>> --- /dev/null
>>> +++ b/drivers/media/platform/rockchip/isp1/mipi_dphy_sy.c
>>> @@ -0,0 +1,805 @@
>>> +/*
>>> + * Rockchip MIPI Synopsys DPHY driver
>>> + *
>>> + * Copyright (C) 2017 Fuzhou Rockchip Electronics Co., Ltd.
>>> + *
>>> + * This software is available to you under a choice of one of two
>>> + * licenses.  You may choose to be licensed under the terms of the GNU
>>> + * General Public License (GPL) Version 2, available from the file
>>> + * COPYING in the main directory of this source tree, or the
>>> + * OpenIB.org BSD license below:
>>> + *
>>> + *     Redistribution and use in source and binary forms, with or
>>> + *     without modification, are permitted provided that the following
>>> + *     conditions are met:
>>> + *
>>> + *      - Redistributions of source code must retain the above
>>> + *        copyright notice, this list of conditions and the following
>>> + *        disclaimer.
>>> + *
>>> + *      - Redistributions in binary form must reproduce the above
>>> + *        copyright notice, this list of conditions and the following
>>> + *        disclaimer in the documentation and/or other materials
>>> + *        provided with the distribution.
>>> + *
>>> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
>>> + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
>>> + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
>>> + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
>>> + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
>>> + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
>>> + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
>>> + * SOFTWARE.
>>> + */
>>> +
>>> +#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
>>> +
>>> +#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 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];
>>> +    int num_sensors;
>>> +    bool is_streaming;
>>> +};
>>> +
>>> +static inline struct mipidphy_priv *to_dphy_priv(struct v4l2_subdev *subdev)
>>> +{
>>> +    return container_of(subdev, struct mipidphy_priv, sd);
>>> +}
>>> +
>>> +static inline void write_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 mipidphy_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_reg(priv, GRF_DPHY_RX0_TESTCLK, 1);
>>> +    write_reg(priv, GRF_DPHY_RX0_TESTDIN, test_code);
>>> +    write_reg(priv, GRF_DPHY_RX0_TESTEN, 1);
>>> +    write_reg(priv, GRF_DPHY_RX0_TESTCLK, 0);
>>> +    write_reg(priv, GRF_DPHY_RX0_TESTEN, 0);
>>> +    write_reg(priv, GRF_DPHY_RX0_TESTDIN, test_data);
>>> +    write_reg(priv, GRF_DPHY_RX0_TESTCLK, 1);
>>> +}
>>> +

It's rockchip spefic, since MIPI-DPHY-RX0 in rockchip SOC write phy
reg through grf.

The other phy, like MIPI-DPHY-TXRX0 in rockchip SOC, write phy reg like this:
https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/rockchip/dw-mipi-dsi.c#L388

>>> +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);
>>> +}
>>> +
>>> +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);
>>> +    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);
>>> +    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;
>>> +    struct v4l2_subdev *sensor_sd = get_remote_sensor(sd);
>>> +    struct mipidphy_sensor *sensor = sd_to_sensor(priv, sensor_sd);
>>> +    int i, ret, hsfreq = 0;
>>> +
>>> +    if (priv->is_streaming)
>>> +            return 0;
>>> +
>>> +    ret = mipidphy_get_sensor_data_rate(sd);
>>> +    if (ret < 0)
>>> +            return ret;
>>> +
>>> +    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_reg(priv, GRF_DPHY_RX0_FORCERXMODE, 0);
>>> +    write_reg(priv, GRF_DPHY_RX0_FORCETXSTOPMODE, 0);
>>> +    /* Disable lan turn around, which is ignored in receive mode */
>>> +    write_reg(priv, GRF_DPHY_RX0_TURNREQUEST, 0);
>>> +    write_reg(priv, GRF_DPHY_RX0_TURNDISABLE, 0xf);
>>> +
>>> +    write_reg(priv, GRF_DPHY_RX0_ENABLE, GENMASK(sensor->lanes - 1, 0));
>>> +
>>> +    /* dphy start */
>>> +    write_reg(priv, GRF_DPHY_RX0_TESTCLK, 1);
>>> +    write_reg(priv, GRF_DPHY_RX0_TESTCLR, 1);
>>> +    usleep_range(100, 150);
>>> +    write_reg(priv, GRF_DPHY_RX0_TESTCLR, 0);
>>> +    usleep_range(100, 150);
>>> +
>>> +    /* set clock lane */
>>> +    /* HS hsfreq_range & lane 0  settle bypass */
>>> +    mipidphy_wr_reg(priv, CLOCK_LANE_HS_RX_CONTROL, 0);
>>> +    /* HS RX Control of lane0 */
>>> +    mipidphy_wr_reg(priv, LANE0_HS_RX_CONTROL, hsfreq << 1);
>>> +    /* HS RX Control of lane1 */
>>> +    mipidphy_wr_reg(priv, LANE1_HS_RX_CONTROL, 0);
>>> +    /* HS RX Control of lane2 */
>>> +    mipidphy_wr_reg(priv, LANE2_HS_RX_CONTROL, 0);
>>> +    /* HS RX Control of lane3 */
>>> +    mipidphy_wr_reg(priv, LANE3_HS_RX_CONTROL, 0);
>>> +    /* HS RX Data Lanes Settle State Time Control */
>>> +    mipidphy_wr_reg(priv, HS_RX_DATA_LANES_THS_SETTLE__CONTROL, 0x04);
>>> +
>>> +    /* Normal operation */
>>> +    mipidphy_wr_reg(priv, 0x0, 0);
>>> +

Those phy reg operations might be synopsys-generic.

>>> +    priv->is_streaming = true;
>>> +
>>> +    return 0;
>>> +}
>>> +
>>> +static int mipidphy_s_stream_stop(struct v4l2_subdev *sd)
>>> +{
>>> +    struct mipidphy_priv *priv = to_dphy_priv(sd);
>>> +
>>> +    if (!priv->is_streaming)
>>> +            return 0;
>>> +
>>> +    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;
>>> +}
>>> +
>>> +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);
>>> +}
>>> +
>>> +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,
>> Why do you need this?
>>
>>> +    .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 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,
>>> +};
>>> +

clocks are rockchip-generic.

>>> +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);
>>> +
>>> +/* 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;
>>> +
>>> +    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;
>>> +
>>> +    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;
>>> +}
>>> +
>>> +/* .complete() is called after all subdevices have been located */
>>> +static int
>>> +rockchip_mipidphy_notifier_complete(struct v4l2_async_notifier *notifier)
>>> +{
>>> +    struct mipidphy_priv *priv = container_of(notifier,
>>> +                                              struct mipidphy_priv,
>>> +                                              notifier);
>>> +    unsigned int pad;
>>> +    int ret;
>>> +    int i;
>>> +
>>> +    for (i = 0; i < priv->num_sensors; ++i) {
>>> +            struct mipidphy_sensor *sensor = &priv->sensors[i];
>>> +
>>> +            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,
>>> +                            i ? 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;
>>> +}
>>> +
>>> +static const
>>> +struct v4l2_async_notifier_operationsrockchip_mipidphy_async_ops = {
>>> +    .bound = rockchip_mipidphy_notifier_bound,
>>> +    .unbind = rockchip_mipidphy_notifier_unbind,
>>> +    .complete = rockchip_mipidphy_notifier_complete,
>>> +};
>>> +
>>> +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);
>>> +}

Those code are used to pass sensor info from mipi-phy driver to isp driver.
I'm not sure if they will be helpful to the other platform.

>>> +
>>> +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;
>>> +    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)) {
>>> +            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;
>>> +
>>> +    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,
>>> +    },
>>> +};
>>> +
>>> +module_platform_driver(rockchip_isp_mipidphy_driver);
>>> +MODULE_AUTHOR("Rockchip Camera/ISP team");
>>> +MODULE_DESCRIPTION("Rockchip MIPI DPHY driver");
>>> +MODULE_LICENSE("Dual BSD/GPL");
>>>
>> Regards,
>>
>>       Hans
>


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