Message-ID: <1c68b62c-2f75-0f45-4d65-4c91ba75ad56@starfivetech.com>
Date:   Mon, 15 May 2023 13:38:40 +0800
From:   Jack Zhu <jack.zhu@...rfivetech.com>
To:     Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Robert Foss <rfoss@...nel.org>,
        Todor Tomov <todor.too@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Eugen Hristev <eugen.hristev@...labora.com>,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
CC:     <linux-media@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <changhuang.liang@...rfivetech.com>
Subject: Re: [PATCH v5 3/6] media: starfive: Add basic driver



On 2023/5/12 20:50, Bryan O'Donoghue wrote:
> On 12/05/2023 11:28, Jack Zhu wrote:
>> Add basic platform driver for StarFive Camera Subsystem.
>>
>> Signed-off-by: Jack Zhu <jack.zhu@...rfivetech.com>
> 
> A couple of nits below
> 
> Other than those
> 
> Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> 
>> ---
>>   MAINTAINERS                                  |   1 +
>>   drivers/media/platform/Kconfig               |   1 +
>>   drivers/media/platform/Makefile              |   1 +
>>   drivers/media/platform/starfive/Kconfig      |  19 +
>>   drivers/media/platform/starfive/Makefile     |   9 +
>>   drivers/media/platform/starfive/stf_camss.c  | 372 +++++++++++++++++++
>>   drivers/media/platform/starfive/stf_camss.h  | 153 ++++++++
>>   drivers/media/platform/starfive/stf_common.h |  18 +
>>   8 files changed, 574 insertions(+)
>>   create mode 100644 drivers/media/platform/starfive/Kconfig
>>   create mode 100644 drivers/media/platform/starfive/Makefile
>>   create mode 100644 drivers/media/platform/starfive/stf_camss.c
>>   create mode 100644 drivers/media/platform/starfive/stf_camss.h
>>   create mode 100644 drivers/media/platform/starfive/stf_common.h
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 71291dc58671..33a752569942 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -20077,6 +20077,7 @@ L:    linux-media@...r.kernel.org
>>   S:    Maintained
>>   F:    Documentation/admin-guide/media/starfive_camss.rst
>>   F:    Documentation/devicetree/bindings/media/starfive,jh7110-camss.yaml
>> +F:    drivers/media/platform/starfive/
>>     STARFIVE DEVICETREES
>>   M:    Emil Renner Berthing <kernel@...il.dk>
>> diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
>> index ee579916f874..627eaa0ab3ee 100644
>> --- a/drivers/media/platform/Kconfig
>> +++ b/drivers/media/platform/Kconfig
>> @@ -80,6 +80,7 @@ source "drivers/media/platform/renesas/Kconfig"
>>   source "drivers/media/platform/rockchip/Kconfig"
>>   source "drivers/media/platform/samsung/Kconfig"
>>   source "drivers/media/platform/st/Kconfig"
>> +source "drivers/media/platform/starfive/Kconfig"
>>   source "drivers/media/platform/sunxi/Kconfig"
>>   source "drivers/media/platform/ti/Kconfig"
>>   source "drivers/media/platform/verisilicon/Kconfig"
>> diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
>> index 5453bb868e67..5a038498a370 100644
>> --- a/drivers/media/platform/Makefile
>> +++ b/drivers/media/platform/Makefile
>> @@ -23,6 +23,7 @@ obj-y += renesas/
>>   obj-y += rockchip/
>>   obj-y += samsung/
>>   obj-y += st/
>> +obj-y += starfive/
>>   obj-y += sunxi/
>>   obj-y += ti/
>>   obj-y += verisilicon/
>> diff --git a/drivers/media/platform/starfive/Kconfig b/drivers/media/platform/starfive/Kconfig
>> new file mode 100644
>> index 000000000000..1a2293475bd2
>> --- /dev/null
>> +++ b/drivers/media/platform/starfive/Kconfig
>> @@ -0,0 +1,19 @@
>> +# SPDX-License-Identifier: GPL-2.0-only
>> +
>> +comment "Starfive media platform drivers"
>> +
>> +config VIDEO_STARFIVE_CAMSS
>> +    tristate "Starfive Camera Subsystem driver"
>> +    depends on V4L_PLATFORM_DRIVERS
>> +    depends on VIDEO_DEV && OF
>> +    depends on DMA_CMA
>> +    select MEDIA_CONTROLLER
>> +    select VIDEO_V4L2_SUBDEV_API
>> +    select VIDEOBUF2_DMA_CONTIG
>> +    select V4L2_FWNODE
>> +    help
>> +       Enable this to support for the Starfive Camera subsystem
>> +       found on Starfive JH7110 SoC.
>> +
>> +       To compile this driver as a module, choose M here: the
>> +       module will be called stf-camss.
>> diff --git a/drivers/media/platform/starfive/Makefile b/drivers/media/platform/starfive/Makefile
>> new file mode 100644
>> index 000000000000..796775fa52f4
>> --- /dev/null
>> +++ b/drivers/media/platform/starfive/Makefile
>> @@ -0,0 +1,9 @@
>> +# SPDX-License-Identifier: GPL-2.0
>> +#
>> +# Makefile for StarFive camera subsystem driver.
>> +#
>> +
>> +starfive-camss-objs += \
>> +        stf_camss.o
>> +
>> +obj-$(CONFIG_VIDEO_STARFIVE_CAMSS) += starfive-camss.o \
>> diff --git a/drivers/media/platform/starfive/stf_camss.c b/drivers/media/platform/starfive/stf_camss.c
>> new file mode 100644
>> index 000000000000..ba3a2bc8a8ab
>> --- /dev/null
>> +++ b/drivers/media/platform/starfive/stf_camss.c
>> @@ -0,0 +1,372 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * stf_camss.c
>> + *
>> + * Starfive Camera Subsystem driver
>> + *
>> + * Copyright (C) 2021-2023 StarFive Technology Co., Ltd.
>> + */
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/of_graph.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/pm_runtime.h>
>> +#include <linux/videodev2.h>
>> +#include <media/media-device.h>
>> +#include <media/v4l2-async.h>
>> +#include <media/v4l2-fwnode.h>
>> +#include <media/v4l2-mc.h>
>> +
>> +#include "stf_camss.h"
>> +
>> +static const char * const stfcamss_clocks[] = {
>> +    "clk_apb_func",
>> +    "clk_wrapper_clk_c",
>> +    "clk_dvp_inv",
>> +    "clk_axiwr",
>> +    "clk_mipi_rx0_pxl",
>> +    "clk_ispcore_2x",
>> +    "clk_isp_axi",
>> +};
>> +
>> +static const char * const stfcamss_resets[] = {
>> +    "rst_wrapper_p",
>> +    "rst_wrapper_c",
>> +    "rst_axird",
>> +    "rst_axiwr",
>> +    "rst_isp_top_n",
>> +    "rst_isp_top_axi",
>> +};
>> +
>> +static int stfcamss_get_mem_res(struct platform_device *pdev,
>> +                struct stfcamss *stfcamss)
>> +{
>> +    stfcamss->syscon_base =
>> +        devm_platform_ioremap_resource_byname(pdev, "syscon");
>> +    if (IS_ERR(stfcamss->syscon_base))
>> +        return PTR_ERR(stfcamss->syscon_base);
>> +
>> +    stfcamss->isp_base =
>> +        devm_platform_ioremap_resource_byname(pdev, "isp");
>> +    if (IS_ERR(stfcamss->isp_base))
>> +        return PTR_ERR(stfcamss->isp_base);
>> +
>> +    return 0;
>> +}
>> +
>> +/*
>> + * stfcamss_of_parse_endpoint_node - Parse port endpoint node
>> + * @dev: Device
>> + * @node: Device node to be parsed
>> + * @csd: Parsed data from port endpoint node
>> + *
>> + * Return 0 on success or a negative error code on failure
>> + */
>> +static int stfcamss_of_parse_endpoint_node(struct device *dev,
>> +                       struct device_node *node,
>> +                       struct stfcamss_async_subdev *csd)
>> +{
>> +    struct v4l2_fwnode_endpoint vep = { { 0 } };
>> +
>> +    v4l2_fwnode_endpoint_parse(of_fwnode_handle(node), &vep);
>> +    dev_dbg(dev, "vep.base.port = 0x%x, id = 0x%x\n",
>> +        vep.base.port, vep.base.id);
>> +
>> +    csd->port = vep.base.port;
>> +
>> +    return 0;
>> +}
>> +
>> +/*
>> + * stfcamss_of_parse_ports - Parse ports node
>> + * @stfcamss: STFCAMSS device
>> + *
>> + * Return number of "port" nodes found in "ports" node
>> + */
>> +static int stfcamss_of_parse_ports(struct stfcamss *stfcamss)
>> +{
>> +    struct device *dev = stfcamss->dev;
>> +    struct device_node *node = NULL;
>> +    struct device_node *remote = NULL;
>> +    int ret, num_subdevs = 0;
>> +
>> +    for_each_endpoint_of_node(dev->of_node, node) {
>> +        struct stfcamss_async_subdev *csd;
>> +
>> +        if (!of_device_is_available(node))
>> +            continue;
>> +
>> +        remote = of_graph_get_remote_port_parent(node);
>> +        if (!remote) {
>> +            dev_err(dev, "Cannot get remote parent\n");
>> +            ret = -EINVAL;
>> +            goto err_cleanup;
>> +        }
>> +
>> +        csd = v4l2_async_nf_add_fwnode(&stfcamss->notifier,
>> +                           of_fwnode_handle(remote),
>> +                           struct stfcamss_async_subdev);
>> +        of_node_put(remote);
>> +        if (IS_ERR(csd)) {
>> +            ret = PTR_ERR(csd);
>> +            goto err_cleanup;
>> +        }
>> +
>> +        ret = stfcamss_of_parse_endpoint_node(dev, node, csd);
>> +        if (ret < 0)
>> +            goto err_cleanup;
>> +
>> +        num_subdevs++;
>> +    }
>> +
>> +    return num_subdevs;
>> +
>> +err_cleanup:
>> +    of_node_put(node);
>> +    return ret;
>> +}
>> +
>> +static int stfcamss_subdev_notifier_bound(struct v4l2_async_notifier *async,
>> +                      struct v4l2_subdev *subdev,
>> +                      struct v4l2_async_subdev *asd)
>> +{
>> +    struct stfcamss *stfcamss =
>> +        container_of(async, struct stfcamss, notifier);
>> +    struct host_data *host_data = &stfcamss->host_data;
>> +    struct media_entity *source;
>> +    int i, j;
>> +
>> +    source = &subdev->entity;
>> +
>> +    for (i = 0; i < source->num_pads; i++) {
>> +        if (source->pads[i].flags & MEDIA_PAD_FL_SOURCE)
>> +            break;
>> +    }
>> +
>> +    if (i == source->num_pads) {
>> +        dev_err(stfcamss->dev, "No source pad in external entity\n");
>> +        return -EINVAL;
>> +    }
>> +
>> +    for (j = 0; host_data->host_entity[j] && (j < HOST_ENTITY_MAX); j++) {
>> +        struct media_entity *input;
>> +        int ret;
>> +
>> +        input = host_data->host_entity[j];
>> +
>> +        ret = media_create_pad_link(
>> +            source,
>> +            i,
>> +            input,
>> +            STF_PAD_SINK,
>> +            source->function == MEDIA_ENT_F_CAM_SENSOR ?
>> +            MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED :
>> +            0);
>> +        if (ret < 0) {
>> +            dev_err(stfcamss->dev,
>> +                "Failed to link %s->%s entities: %d\n",
>> +                source->name, input->name, ret);
>> +            return ret;
>> +        }
>> +    }
>> +
>> +    return 0;
>> +}
>> +
>> +static int stfcamss_subdev_notifier_complete(struct v4l2_async_notifier *ntf)
>> +{
>> +    struct stfcamss *stfcamss =
>> +        container_of(ntf, struct stfcamss, notifier);
>> +
>> +    return v4l2_device_register_subdev_nodes(&stfcamss->v4l2_dev);
>> +}
>> +
>> +static const struct v4l2_async_notifier_operations
>> +stfcamss_subdev_notifier_ops = {
>> +    .bound = stfcamss_subdev_notifier_bound,
>> +    .complete = stfcamss_subdev_notifier_complete,
>> +};
>> +
>> +static const struct media_device_ops stfcamss_media_ops = {
>> +    .link_notify = v4l2_pipeline_link_notify,
>> +};
>> +
>> +static void stfcamss_mc_init(struct platform_device *pdev,
>> +                 struct stfcamss *stfcamss)
>> +{
>> +    stfcamss->media_dev.dev = stfcamss->dev;
>> +    strscpy(stfcamss->media_dev.model, "Starfive Camera Subsystem",
>> +        sizeof(stfcamss->media_dev.model));
>> +    snprintf(stfcamss->media_dev.bus_info,
>> +         sizeof(stfcamss->media_dev.bus_info),
>> +         "%s:%s", dev_bus_name(&pdev->dev), pdev->name);
>> +    stfcamss->media_dev.hw_revision = 0x01;
>> +    stfcamss->media_dev.ops = &stfcamss_media_ops;
>> +    media_device_init(&stfcamss->media_dev);
>> +
>> +    stfcamss->v4l2_dev.mdev = &stfcamss->media_dev;
>> +}
>> +
>> +/*
>> + * stfcamss_probe - Probe STFCAMSS platform device
>> + * @pdev: Pointer to STFCAMSS platform device
>> + *
>> + * Return 0 on success or a negative error code on failure
>> + */
>> +static int stfcamss_probe(struct platform_device *pdev)
>> +{
>> +    struct stfcamss *stfcamss;
>> +    struct device *dev = &pdev->dev;
>> +    int ret = 0, i, num_subdevs;
>> +
>> +    stfcamss = devm_kzalloc(dev, sizeof(*stfcamss), GFP_KERNEL);
>> +    if (!stfcamss)
>> +        return -ENOMEM;
>> +
>> +    for (i = 0; i < ARRAY_SIZE(stfcamss->irq); ++i) {
>> +        stfcamss->irq[i] = platform_get_irq(pdev, i);
>> +        if (stfcamss->irq[i] < 0)
>> +            return dev_err_probe(&pdev->dev, stfcamss->irq[i],
>> +                         "Failed to get clock%d", i);
>> +    }
>> +
>> +    stfcamss->nclks = ARRAY_SIZE(stfcamss->sys_clk);
>> +    for (i = 0; i < ARRAY_SIZE(stfcamss->sys_clk); ++i)
> 
> Why use ARRAY_SIZE twice - you just derived stfcamss->nclks

OK, will use stfcamss->nclks. Thank you for your review.

> 
>> +        stfcamss->sys_clk[i].id = stfcamss_clocks[i];
>> +    ret = devm_clk_bulk_get(dev, stfcamss->nclks, stfcamss->sys_clk);
>> +    if (ret) {
>> +        dev_err(dev, "Failed to get clk controls\n");
>> +        return ret;
>> +    }
>> +
>> +    stfcamss->nrsts = ARRAY_SIZE(stfcamss->sys_rst);
>> +    for (i = 0; i < ARRAY_SIZE(stfcamss->sys_rst); ++i)
> 
> i < stfcamss->nrsts

OK, will fix it. Thanks!

> 
>> +        stfcamss->sys_rst[i].id = stfcamss_resets[i];
>> +    ret = devm_reset_control_bulk_get_shared(dev, stfcamss->nrsts,
>> +                         stfcamss->sys_rst);
>> +    if (ret) {
>> +        dev_err(dev, "Failed to get reset controls\n");
>> +        return ret;
>> +    }
>> +
>> +    ret = stfcamss_get_mem_res(pdev, stfcamss);
>> +    if (ret) {
>> +        dev_err(dev, "Could not map registers\n");
>> +        return ret;
>> +    }
>> +
>> +    stfcamss->dev = dev;
>> +    platform_set_drvdata(pdev, stfcamss);
>> +
>> +    v4l2_async_nf_init(&stfcamss->notifier);
>> +
>> +    num_subdevs = stfcamss_of_parse_ports(stfcamss);
>> +    if (num_subdevs < 0) {
>> +        dev_err(dev, "Failed to find subdevices\n");
>> +        return -ENODEV;
>> +    }
>> +
>> +    stfcamss_mc_init(pdev, stfcamss);
>> +
>> +    ret = v4l2_device_register(stfcamss->dev, &stfcamss->v4l2_dev);
>> +    if (ret < 0) {
>> +        dev_err(dev, "Failed to register V4L2 device: %d\n", ret);
>> +        goto err_cleanup_notifier;
>> +    }
>> +
>> +    ret = media_device_register(&stfcamss->media_dev);
>> +    if (ret) {
>> +        dev_err(dev, "Failed to register media device: %d\n", ret);
>> +        goto err_unregister_device;
>> +    }
>> +
>> +    stfcamss->notifier.ops = &stfcamss_subdev_notifier_ops;
>> +    ret = v4l2_async_nf_register(&stfcamss->v4l2_dev, &stfcamss->notifier);
>> +    if (ret) {
>> +        dev_err(dev, "Failed to register async subdev nodes: %d\n",
>> +            ret);
>> +        goto err_unregister_media_dev;
>> +    }
>> +
>> +    pm_runtime_enable(dev);
>> +
>> +    return 0;
>> +
>> +err_unregister_media_dev:
>> +    media_device_unregister(&stfcamss->media_dev);
>> +err_unregister_device:
>> +    v4l2_device_unregister(&stfcamss->v4l2_dev);
>> +err_cleanup_notifier:
>> +    v4l2_async_nf_cleanup(&stfcamss->notifier);
>> +    return ret;
>> +}
>> +
>> +/*
>> + * stfcamss_remove - Remove STFCAMSS platform device
>> + * @pdev: Pointer to STFCAMSS platform device
>> + *
>> + * Always returns 0.
>> + */
>> +static int stfcamss_remove(struct platform_device *pdev)
>> +{
>> +    struct stfcamss *stfcamss = platform_get_drvdata(pdev);
>> +
>> +    v4l2_device_unregister(&stfcamss->v4l2_dev);
>> +    media_device_cleanup(&stfcamss->media_dev);
>> +    pm_runtime_disable(&pdev->dev);
>> +
>> +    return 0;
>> +}
>> +
>> +static const struct of_device_id stfcamss_of_match[] = {
>> +    { .compatible = "starfive,jh7110-camss" },
>> +    { /* sentinel */ },
>> +};
>> +
>> +MODULE_DEVICE_TABLE(of, stfcamss_of_match);
>> +
>> +static int __maybe_unused stfcamss_runtime_suspend(struct device *dev)
>> +{
>> +    struct stfcamss *stfcamss = dev_get_drvdata(dev);
>> +
>> +    reset_control_assert(stfcamss->sys_rst[STF_RST_ISP_TOP_AXI].rstc);
>> +    reset_control_assert(stfcamss->sys_rst[STF_RST_ISP_TOP_N].rstc);
>> +    clk_disable_unprepare(stfcamss->sys_clk[STF_CLK_ISP_AXI].clk);
>> +    clk_disable_unprepare(stfcamss->sys_clk[STF_CLK_ISPCORE_2X].clk);
>> +
>> +    return 0;
>> +}
>> +
>> +static int __maybe_unused stfcamss_runtime_resume(struct device *dev)
>> +{
>> +    struct stfcamss *stfcamss = dev_get_drvdata(dev);
>> +
>> +    clk_prepare_enable(stfcamss->sys_clk[STF_CLK_ISPCORE_2X].clk);
>> +    clk_prepare_enable(stfcamss->sys_clk[STF_CLK_ISP_AXI].clk);
>> +    reset_control_deassert(stfcamss->sys_rst[STF_RST_ISP_TOP_N].rstc);
>> +    reset_control_deassert(stfcamss->sys_rst[STF_RST_ISP_TOP_AXI].rstc);
>> +
>> +    return 0;
>> +}
>> +
>> +static const struct dev_pm_ops stfcamss_pm_ops = {
>> +    SET_RUNTIME_PM_OPS(stfcamss_runtime_suspend,
>> +               stfcamss_runtime_resume,
>> +               NULL)
>> +};
>> +
>> +static struct platform_driver stfcamss_driver = {
>> +    .probe = stfcamss_probe,
>> +    .remove = stfcamss_remove,
>> +    .driver = {
>> +        .name = DRV_NAME,
>> +        .pm = &stfcamss_pm_ops,
>> +        .of_match_table = of_match_ptr(stfcamss_of_match),
>> +    },
>> +};
>> +
>> +module_platform_driver(stfcamss_driver);
>> +
>> +MODULE_AUTHOR("StarFive Corporation");
>> +MODULE_DESCRIPTION("StarFive Camera Subsystem driver");
>> +MODULE_LICENSE("GPL");
>> diff --git a/drivers/media/platform/starfive/stf_camss.h b/drivers/media/platform/starfive/stf_camss.h
>> new file mode 100644
>> index 000000000000..8f39cd65950c
>> --- /dev/null
>> +++ b/drivers/media/platform/starfive/stf_camss.h
>> @@ -0,0 +1,153 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/*
>> + * stf_camss.h
>> + *
>> + * Starfive Camera Subsystem driver
>> + *
>> + * Copyright (C) 2021-2023 StarFive Technology Co., Ltd.
>> + */
>> +
>> +#ifndef STF_CAMSS_H
>> +#define STF_CAMSS_H
>> +
>> +#include <linux/clk.h>
>> +#include <linux/delay.h>
>> +#include <linux/reset.h>
>> +#include <media/v4l2-device.h>
>> +
>> +#include "stf_common.h"
>> +
>> +#define DRV_NAME     "starfive-camss"
>> +#define STF_DVP_NAME "stf_dvp"
>> +#define STF_CSI_NAME "cdns_csi2rx"
>> +#define STF_ISP_NAME "stf_isp"
>> +#define STF_VIN_NAME "stf_vin"
>> +
>> +#define STF_PAD_SINK   0
>> +#define STF_PAD_SRC    1
>> +#define STF_PADS_NUM   2
>> +
>> +enum port_num {
>> +    PORT_NUMBER_DVP_SENSOR = 0,
>> +    PORT_NUMBER_CSI2RX
>> +};
>> +
>> +enum stf_clk {
>> +    STF_CLK_APB_FUNC = 0,
>> +    STF_CLK_WRAPPER_CLK_C,
>> +    STF_CLK_DVP_INV,
>> +    STF_CLK_AXIWR,
>> +    STF_CLK_MIPI_RX0_PXL,
>> +    STF_CLK_ISPCORE_2X,
>> +    STF_CLK_ISP_AXI,
>> +    STF_CLK_NUM
>> +};
>> +
>> +enum stf_rst {
>> +    STF_RST_WRAPPER_P = 0,
>> +    STF_RST_WRAPPER_C,
>> +    STF_RST_AXIRD,
>> +    STF_RST_AXIWR,
>> +    STF_RST_ISP_TOP_N,
>> +    STF_RST_ISP_TOP_AXI,
>> +    STF_RST_NUM
>> +};
>> +
>> +enum stf_irq {
>> +    STF_IRQ_VINWR = 0,
>> +    STF_IRQ_ISP,
>> +    STF_IRQ_ISPCSIL,
>> +    STF_IRQ_NUM
>> +};
>> +
>> +#define HOST_ENTITY_MAX        2
>> +
>> +struct host_data {
>> +    struct media_entity *host_entity[HOST_ENTITY_MAX];
>> +};
>> +
>> +struct stfcamss {
>> +    struct v4l2_device v4l2_dev;
>> +    struct media_device media_dev;
>> +    struct media_pipeline pipe;
>> +    struct device *dev;
>> +    struct v4l2_async_notifier notifier;
>> +    struct host_data host_data;
>> +    void __iomem *syscon_base;
>> +    void __iomem *isp_base;
>> +    int irq[STF_IRQ_NUM];
>> +    struct clk_bulk_data sys_clk[STF_CLK_NUM];
>> +    int nclks;
>> +    struct reset_control_bulk_data sys_rst[STF_RST_NUM];
>> +    int nrsts;
>> +};
>> +
>> +struct stfcamss_async_subdev {
>> +    struct v4l2_async_subdev asd;  /* must be first */
>> +    enum port_num port;
>> +};
>> +
>> +static inline u32 stf_isp_reg_read(struct stfcamss *stfcamss, u32 reg)
>> +{
>> +    return ioread32(stfcamss->isp_base + reg);
>> +}
>> +
>> +static inline void stf_isp_reg_write(struct stfcamss *stfcamss,
>> +                     u32 reg, u32 val)
>> +{
>> +    iowrite32(val, stfcamss->isp_base + reg);
>> +}
>> +
>> +static inline void stf_isp_reg_write_delay(struct stfcamss *stfcamss,
>> +                       u32 reg, u32 val, u32 delay)
>> +{
>> +    iowrite32(val, stfcamss->isp_base + reg);
>> +    usleep_range(1000 * delay, 1000 * delay + 100);
>> +}
>> +
>> +static inline void stf_isp_reg_set_bit(struct stfcamss *stfcamss,
>> +                       u32 reg, u32 mask, u32 val)
>> +{
>> +    u32 value;
>> +
>> +    value = ioread32(stfcamss->isp_base + reg) & ~mask;
>> +    val &= mask;
>> +    val |= value;
>> +    iowrite32(val, stfcamss->isp_base + reg);
>> +}
>> +
>> +static inline void stf_isp_reg_set(struct stfcamss *stfcamss, u32 reg, u32 mask)
>> +{
>> +    iowrite32(ioread32(stfcamss->isp_base + reg) | mask,
>> +          stfcamss->isp_base + reg);
>> +}
>> +
>> +static inline u32 stf_syscon_reg_read(struct stfcamss *stfcamss, u32 reg)
>> +{
>> +    return ioread32(stfcamss->syscon_base + reg);
>> +}
>> +
>> +static inline void stf_syscon_reg_write(struct stfcamss *stfcamss,
>> +                    u32 reg, u32 val)
>> +{
>> +    iowrite32(val, stfcamss->syscon_base + reg);
>> +}
>> +
>> +static inline void stf_syscon_reg_set_bit(struct stfcamss *stfcamss,
>> +                      u32 reg, u32 bit_mask)
>> +{
>> +    u32 value;
>> +
>> +    value = ioread32(stfcamss->syscon_base + reg);
>> +    iowrite32(value | bit_mask, stfcamss->syscon_base + reg);
>> +}
>> +
>> +static inline void stf_syscon_reg_clear_bit(struct stfcamss *stfcamss,
>> +                        u32 reg, u32 bit_mask)
>> +{
>> +    u32 value;
>> +
>> +    value = ioread32(stfcamss->syscon_base + reg);
>> +    iowrite32(value & ~bit_mask, stfcamss->syscon_base + reg);
>> +}
>> +#endif /* STF_CAMSS_H */
>> diff --git a/drivers/media/platform/starfive/stf_common.h b/drivers/media/platform/starfive/stf_common.h
>> new file mode 100644
>> index 000000000000..e04fca2d9cd4
>> --- /dev/null
>> +++ b/drivers/media/platform/starfive/stf_common.h
>> @@ -0,0 +1,18 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/*
>> + * stf_common.h
>> + *
>> + * StarFive Camera Subsystem - Common definitions
>> + *
>> + * Copyright (C) 2021-2023 StarFive Technology Co., Ltd.
>> + */
>> +
>> +#ifndef STF_COMMON_H
>> +#define STF_COMMON_H
>> +
>> +enum stf_subdev_type {
>> +    STF_SUBDEV_TYPE_VIN,
>> +    STF_SUBDEV_TYPE_ISP,
>> +};
>> +
>> +#endif /* STF_COMMON_H */
> 

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