devfreq/event/rockchip-dfi.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd
 * Author: Lin Huang <hl@rock-chips.com>
 */

#include <linux/clk.h>
#include <linux/devfreq-event.h>
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/of.h>

#include <soc/rockchip/rk3399_grf.h>

#define PX30_PMUGRF_OS_REG2 0x208
#define PX30_PMUGRF_OS_REG3 0x20c

#define RK3128_GRF_SOC_CON0 0x140
#define RK3128_GRF_OS_REG1 0x1cc
#define RK3128_GRF_DFI_WRNUM 0x220
#define RK3128_GRF_DFI_RDNUM 0x224
#define RK3128_GRF_DFI_TIMERVAL 0x22c
#define RK3128_DDR_MONITOR_EN ((1 << (16 + 6)) + (1 << 6))
#define RK3128_DDR_MONITOR_DISB ((1 << (16 + 6)) + (0 << 6))

#define RK3288_PMU_SYS_REG2 0x9c
#define RK3288_GRF_SOC_CON4 0x254
#define RK3288_GRF_SOC_STATUS(n) (0x280 + (n)*4)
#define RK3288_DFI_EN (0x30003 << 14)
#define RK3288_DFI_DIS (0x30000 << 14)
#define RK3288_LPDDR_SEL (0x10001 << 13)
#define RK3288_DDR3_SEL (0x10000 << 13)

#define RK3328_GRF_OS_REG2 0x5d0

#define RK3368_GRF_DDRC0_CON0 0x600
#define RK3368_GRF_SOC_STATUS5 0x494
#define RK3368_GRF_SOC_STATUS6 0x498
#define RK3368_GRF_SOC_STATUS8 0x4a0
#define RK3368_GRF_SOC_STATUS9 0x4a4
#define RK3368_GRF_SOC_STATUS10 0x4a8
#define RK3368_DFI_EN (0x30003 << 5)
#define RK3368_DFI_DIS (0x30000 << 5)

#define MAX_DMC_NUM_CH 2
#define READ_DRAMTYPE_INFO(n) (((n) >> 13) & 0x7)
#define READ_CH_INFO(n) (((n) >> 28) & 0x3)
#define READ_DRAMTYPE_INFO_V3(n, m) ((((n) >> 13) & 0x7) | ((((m) >> 12) & 0x3) << 3))
#define READ_SYSREG_VERSION(m) (((m) >> 28) & 0xf)
/* DDRMON_CTRL */
#define DDRMON_CTRL 0x04
#define CLR_DDRMON_CTRL (0x3f0000 << 0)
#define DDR4_EN (0x10001 << 5)
#define LPDDR4_EN (0x10001 << 4)
#define HARDWARE_EN (0x10001 << 3)
#define LPDDR2_3_EN (0x10001 << 2)
#define SOFTWARE_EN (0x10001 << 1)
#define SOFTWARE_DIS (0x10000 << 1)
#define TIME_CNT_EN (0x10001 << 0)

#define DDRMON_CH0_COUNT_NUM 0x28
#define DDRMON_CH0_DFI_ACCESS_NUM 0x2c
#define DDRMON_CH1_COUNT_NUM 0x3c
#define DDRMON_CH1_DFI_ACCESS_NUM 0x40

/* pmu grf */
#define PMUGRF_OS_REG2 0x308

enum { DDR4 = 0, DDR3 = 3, LPDDR2 = 5, LPDDR3 = 6, LPDDR4 = 7, LPDDR4X = 8, UNUSED = 0xFF };

struct dmc_usage {
    u32 access;
    u32 total;
};

/*
 * The dfi controller can monitor DDR load. It has an upper and lower threshold
 * for the operating points. Whenever the usage leaves these bounds an event is
 * generated to indicate the DDR frequency should be changed.
 */
struct rockchip_dfi {
    struct devfreq_event_dev *edev;
    struct devfreq_event_desc *desc;
    struct dmc_usage ch_usage[MAX_DMC_NUM_CH];
    struct device *dev;
    void __iomem *regs;
    struct regmap *regmap_pmu;
    struct regmap *regmap_grf;
    struct regmap *regmap_pmugrf;
    struct clk *clk;
    u32 dram_type;
    /*
     * available mask, 1: available, 0: not available
     * each bit represent a channel
     */
    u32 ch_msk;
};

static void rk3128_dfi_start_hardware_counter(struct devfreq_event_dev *edev)
{
    struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);

    regmap_write(info->regmap_grf, RK3128_GRF_SOC_CON0, RK3128_DDR_MONITOR_EN);
}

static void rk3128_dfi_stop_hardware_counter(struct devfreq_event_dev *edev)
{
    struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);

    regmap_write(info->regmap_grf, RK3128_GRF_SOC_CON0, RK3128_DDR_MONITOR_DISB);
}

static int rk3128_dfi_disable(struct devfreq_event_dev *edev)
{
    rk3128_dfi_stop_hardware_counter(edev);

    return 0;
}

static int rk3128_dfi_enable(struct devfreq_event_dev *edev)
{
    rk3128_dfi_start_hardware_counter(edev);

    return 0;
}

static int rk3128_dfi_set_event(struct devfreq_event_dev *edev)
{
    return 0;
}

static int rk3128_dfi_get_event(struct devfreq_event_dev *edev, struct devfreq_event_data *edata)
{
    struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
    unsigned long flags;
    u32 dfi_wr, dfi_rd, dfi_timer;

    local_irq_save(flags);

    rk3128_dfi_stop_hardware_counter(edev);

    regmap_read(info->regmap_grf, RK3128_GRF_DFI_WRNUM, &dfi_wr);
    regmap_read(info->regmap_grf, RK3128_GRF_DFI_RDNUM, &dfi_rd);
    regmap_read(info->regmap_grf, RK3128_GRF_DFI_TIMERVAL, &dfi_timer);

    edata->load_count = (dfi_wr + dfi_rd) * 0x4;
    edata->total_count = dfi_timer;

    rk3128_dfi_start_hardware_counter(edev);

    local_irq_restore(flags);

    return 0;
}

static const struct devfreq_event_ops rk3128_dfi_ops = {
    .disable = rk3128_dfi_disable,
    .enable = rk3128_dfi_enable,
    .get_event = rk3128_dfi_get_event,
    .set_event = rk3128_dfi_set_event,
};

static void rk3288_dfi_start_hardware_counter(struct devfreq_event_dev *edev)
{
    struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);

    regmap_write(info->regmap_grf, RK3288_GRF_SOC_CON4, RK3288_DFI_EN);
}

static void rk3288_dfi_stop_hardware_counter(struct devfreq_event_dev *edev)
{
    struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);

    regmap_write(info->regmap_grf, RK3288_GRF_SOC_CON4, RK3288_DFI_DIS);
}

static int rk3288_dfi_disable(struct devfreq_event_dev *edev)
{
    rk3288_dfi_stop_hardware_counter(edev);

    return 0;
}

static int rk3288_dfi_enable(struct devfreq_event_dev *edev)
{
    rk3288_dfi_start_hardware_counter(edev);

    return 0;
}

static int rk3288_dfi_set_event(struct devfreq_event_dev *edev)
{
    return 0;
}

static int rk3288_dfi_get_busier_ch(struct devfreq_event_dev *edev)
{
    struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
    u32 tmp, max = 0;
    u32 i, busier_ch = 0;
    u32 rd_count, wr_count, total_count;

    rk3288_dfi_stop_hardware_counter(edev);

    /* Find out which channel is busier */
    for (i = 0; i < MAX_DMC_NUM_CH; i++) {
        if (!(info->ch_msk & BIT(i))) {
            continue;
        }
        regmap_read(info->regmap_grf, RK3288_GRF_SOC_STATUS(0xb + i * 0x4), &wr_count);
        regmap_read(info->regmap_grf, RK3288_GRF_SOC_STATUS(0xc + i * 0x4), &rd_count);
        regmap_read(info->regmap_grf, RK3288_GRF_SOC_STATUS(0xe + i * 0x4), &total_count);
        info->ch_usage[i].access = (wr_count + rd_count) * 0x4;
        info->ch_usage[i].total = total_count;
        tmp = info->ch_usage[i].access;
        if (tmp > max) {
            busier_ch = i;
            max = tmp;
        }
    }
    rk3288_dfi_start_hardware_counter(edev);

    return busier_ch;
}

static int rk3288_dfi_get_event(struct devfreq_event_dev *edev, struct devfreq_event_data *edata)
{
    struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
    int busier_ch;
    unsigned long flags;

    local_irq_save(flags);
    busier_ch = rk3288_dfi_get_busier_ch(edev);
    local_irq_restore(flags);

    edata->load_count = info->ch_usage[busier_ch].access;
    edata->total_count = info->ch_usage[busier_ch].total;

    return 0;
}

static const struct devfreq_event_ops rk3288_dfi_ops = {
    .disable = rk3288_dfi_disable,
    .enable = rk3288_dfi_enable,
    .get_event = rk3288_dfi_get_event,
    .set_event = rk3288_dfi_set_event,
};

static void rk3368_dfi_start_hardware_counter(struct devfreq_event_dev *edev)
{
    struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);

    regmap_write(info->regmap_grf, RK3368_GRF_DDRC0_CON0, RK3368_DFI_EN);
}

static void rk3368_dfi_stop_hardware_counter(struct devfreq_event_dev *edev)
{
    struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);

    regmap_write(info->regmap_grf, RK3368_GRF_DDRC0_CON0, RK3368_DFI_DIS);
}

static int rk3368_dfi_disable(struct devfreq_event_dev *edev)
{
    rk3368_dfi_stop_hardware_counter(edev);

    return 0;
}

static int rk3368_dfi_enable(struct devfreq_event_dev *edev)
{
    rk3368_dfi_start_hardware_counter(edev);

    return 0;
}

static int rk3368_dfi_set_event(struct devfreq_event_dev *edev)
{
    return 0;
}

static int rk3368_dfi_get_event(struct devfreq_event_dev *edev, struct devfreq_event_data *edata)
{
    struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
    unsigned long flags;
    u32 dfi0_wr, dfi0_rd, dfi1_wr, dfi1_rd, dfi_timer;

    local_irq_save(flags);

    rk3368_dfi_stop_hardware_counter(edev);

    regmap_read(info->regmap_grf, RK3368_GRF_SOC_STATUS5, &dfi0_wr);
    regmap_read(info->regmap_grf, RK3368_GRF_SOC_STATUS6, &dfi0_rd);
    regmap_read(info->regmap_grf, RK3368_GRF_SOC_STATUS9, &dfi1_wr);
    regmap_read(info->regmap_grf, RK3368_GRF_SOC_STATUS10, &dfi1_rd);
    regmap_read(info->regmap_grf, RK3368_GRF_SOC_STATUS8, &dfi_timer);

    edata->load_count = (dfi0_wr + dfi0_rd + dfi1_wr + dfi1_rd) * 0x2;
    edata->total_count = dfi_timer;

    rk3368_dfi_start_hardware_counter(edev);

    local_irq_restore(flags);

    return 0;
}

static const struct devfreq_event_ops rk3368_dfi_ops = {
    .disable = rk3368_dfi_disable,
    .enable = rk3368_dfi_enable,
    .get_event = rk3368_dfi_get_event,
    .set_event = rk3368_dfi_set_event,
};

static void rockchip_dfi_start_hardware_counter(struct devfreq_event_dev *edev)
{
    struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
    void __iomem *dfi_regs = info->regs;

    /* clear DDRMON_CTRL setting */
    writel_relaxed(CLR_DDRMON_CTRL, dfi_regs + DDRMON_CTRL);

    /* set ddr type to dfi */
    if (info->dram_type == LPDDR3 || info->dram_type == LPDDR2) {
        writel_relaxed(LPDDR2_3_EN, dfi_regs + DDRMON_CTRL);
    } else if (info->dram_type == LPDDR4 || info->dram_type == LPDDR4X) {
        writel_relaxed(LPDDR4_EN, dfi_regs + DDRMON_CTRL);
    } else if (info->dram_type == DDR4) {
        writel_relaxed(DDR4_EN, dfi_regs + DDRMON_CTRL);
    }

    /* enable count, use software mode */
    writel_relaxed(SOFTWARE_EN, dfi_regs + DDRMON_CTRL);
}

static void rockchip_dfi_stop_hardware_counter(struct devfreq_event_dev *edev)
{
    struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
    void __iomem *dfi_regs = info->regs;

    writel_relaxed(SOFTWARE_DIS, dfi_regs + DDRMON_CTRL);
}

static int rockchip_dfi_get_busier_ch(struct devfreq_event_dev *edev)
{
    struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
    u32 tmp, max = 0;
    u32 i, busier_ch = 0;
    void __iomem *dfi_regs = info->regs;

    rockchip_dfi_stop_hardware_counter(edev);

    /* Find out which channel is busier */
    for (i = 0; i < MAX_DMC_NUM_CH; i++) {
        if (!(info->ch_msk & BIT(i))) {
            continue;
        }

        info->ch_usage[i].total = readl_relaxed(dfi_regs + DDRMON_CH0_COUNT_NUM + i * 0x14);

        /* LPDDR4 and LPDDR4X BL = 16,other DDR type BL = 8 */
        tmp = readl_relaxed(dfi_regs + DDRMON_CH0_DFI_ACCESS_NUM + i * 0x14);
        if (info->dram_type == LPDDR4 || info->dram_type == LPDDR4X) {
            tmp *= 0x8;
        } else {
            tmp *= 0x4;
        }
        info->ch_usage[i].access = tmp;

        if (tmp > max) {
            busier_ch = i;
            max = tmp;
        }
    }
    rockchip_dfi_start_hardware_counter(edev);

    return busier_ch;
}

static int rockchip_dfi_disable(struct devfreq_event_dev *edev)
{
    struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);

    rockchip_dfi_stop_hardware_counter(edev);
    if (info->clk) {
        clk_disable_unprepare(info->clk);
    }

    return 0;
}

static int rockchip_dfi_enable(struct devfreq_event_dev *edev)
{
    struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
    int ret;

    if (info->clk) {
        ret = clk_prepare_enable(info->clk);
        if (ret) {
            dev_err(&edev->dev, "failed to enable dfi clk: %d\n", ret);
            return ret;
        }
    }

    rockchip_dfi_start_hardware_counter(edev);
    return 0;
}

static int rockchip_dfi_set_event(struct devfreq_event_dev *edev)
{
    return 0;
}

static int rockchip_dfi_get_event(struct devfreq_event_dev *edev, struct devfreq_event_data *edata)
{
    struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
    int busier_ch;
    unsigned long flags;

    local_irq_save(flags);
    busier_ch = rockchip_dfi_get_busier_ch(edev);
    local_irq_restore(flags);

    edata->load_count = info->ch_usage[busier_ch].access;
    edata->total_count = info->ch_usage[busier_ch].total;

    return 0;
}

static const struct devfreq_event_ops rockchip_dfi_ops = {
    .disable = rockchip_dfi_disable,
    .enable = rockchip_dfi_enable,
    .get_event = rockchip_dfi_get_event,
    .set_event = rockchip_dfi_set_event,
};

static __init int px30_dfi_init(struct platform_device *pdev, struct rockchip_dfi *data,
                                struct devfreq_event_desc *desc)
{
    struct device_node *np = pdev->dev.of_node, *node;
    struct resource *res;
    u32 val_2, val_3;

    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    data->regs = devm_ioremap_resource(&pdev->dev, res);
    if (IS_ERR(data->regs)) {
        return PTR_ERR(data->regs);
    }

    node = of_parse_phandle(np, "rockchip,pmugrf", 0);
    if (node) {
        data->regmap_pmugrf = syscon_node_to_regmap(node);
        if (IS_ERR(data->regmap_pmugrf)) {
            return PTR_ERR(data->regmap_pmugrf);
        }
    }

    regmap_read(data->regmap_pmugrf, PX30_PMUGRF_OS_REG2, &val_2);
    regmap_read(data->regmap_pmugrf, PX30_PMUGRF_OS_REG3, &val_3);
    if (READ_SYSREG_VERSION(val_3) >= 0x3) {
        data->dram_type = READ_DRAMTYPE_INFO_V3(val_2, val_3);
    } else {
        data->dram_type = READ_DRAMTYPE_INFO(val_2);
    }
    data->ch_msk = 1;
    data->clk = NULL;

    desc->ops = &rockchip_dfi_ops;

    return 0;
}

static __init int rk3128_dfi_init(struct platform_device *pdev, struct rockchip_dfi *data,
                                  struct devfreq_event_desc *desc)
{
    struct device_node *np = pdev->dev.of_node, *node;

    node = of_parse_phandle(np, "rockchip,grf", 0);
    if (node) {
        data->regmap_grf = syscon_node_to_regmap(node);
        if (IS_ERR(data->regmap_grf)) {
            return PTR_ERR(data->regmap_grf);
        }
    }

    desc->ops = &rk3128_dfi_ops;

    return 0;
}

static __init int rk3288_dfi_init(struct platform_device *pdev, struct rockchip_dfi *data,
                                  struct devfreq_event_desc *desc)
{
    struct device_node *np = pdev->dev.of_node, *node;
    u32 val;

    node = of_parse_phandle(np, "rockchip,pmu", 0);
    if (node) {
        data->regmap_pmu = syscon_node_to_regmap(node);
        if (IS_ERR(data->regmap_pmu)) {
            return PTR_ERR(data->regmap_pmu);
        }
    }

    node = of_parse_phandle(np, "rockchip,grf", 0);
    if (node) {
        data->regmap_grf = syscon_node_to_regmap(node);
        if (IS_ERR(data->regmap_grf)) {
            return PTR_ERR(data->regmap_grf);
        }
    }

    regmap_read(data->regmap_pmu, RK3288_PMU_SYS_REG2, &val);
    data->dram_type = READ_DRAMTYPE_INFO(val);
    data->ch_msk = READ_CH_INFO(val);

    if (data->dram_type == DDR3) {
        regmap_write(data->regmap_grf, RK3288_GRF_SOC_CON4, RK3288_DDR3_SEL);
    } else {
        regmap_write(data->regmap_grf, RK3288_GRF_SOC_CON4, RK3288_LPDDR_SEL);
    }

    desc->ops = &rk3288_dfi_ops;

    return 0;
}

static __init int rk3368_dfi_init(struct platform_device *pdev, struct rockchip_dfi *data,
                                  struct devfreq_event_desc *desc)
{
    struct device *dev = &pdev->dev;

    if (!dev->parent || !dev->parent->of_node) {
        return -EINVAL;
    }

    data->regmap_grf = syscon_node_to_regmap(dev->parent->of_node);
    if (IS_ERR(data->regmap_grf)) {
        return PTR_ERR(data->regmap_grf);
    }

    desc->ops = &rk3368_dfi_ops;

    return 0;
}

static __init int rockchip_dfi_init(struct platform_device *pdev, struct rockchip_dfi *data,
                                    struct devfreq_event_desc *desc)
{
    struct device *dev = &pdev->dev;
    struct device_node *np = pdev->dev.of_node, *node;
    u32 val;

    data->regs = devm_platform_ioremap_resource(pdev, 0);
    if (IS_ERR(data->regs)) {
        return PTR_ERR(data->regs);
    }

    data->clk = devm_clk_get(dev, "pclk_ddr_mon");
    if (IS_ERR(data->clk)) {
        dev_err(dev, "Cannot get the clk dmc_clk\n");
        return PTR_ERR(data->clk);
    }

    /* try to find the optional reference to the pmu syscon */
    node = of_parse_phandle(np, "rockchip,pmu", 0);
    if (node) {
        data->regmap_pmu = syscon_node_to_regmap(node);
        of_node_put(node);
        if (IS_ERR(data->regmap_pmu)) {
            return PTR_ERR(data->regmap_pmu);
        }
    }

    regmap_read(data->regmap_pmu, PMUGRF_OS_REG2, &val);
    data->dram_type = READ_DRAMTYPE_INFO(val);
    data->ch_msk = READ_CH_INFO(val);

    desc->ops = &rockchip_dfi_ops;

    return 0;
}

static __init int rk3328_dfi_init(struct platform_device *pdev, struct rockchip_dfi *data,
                                  struct devfreq_event_desc *desc)
{
    struct device_node *np = pdev->dev.of_node, *node;
    struct resource *res;
    u32 val;

    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    data->regs = devm_ioremap_resource(&pdev->dev, res);
    if (IS_ERR(data->regs)) {
        return PTR_ERR(data->regs);
    }

    node = of_parse_phandle(np, "rockchip,grf", 0);
    if (node) {
        data->regmap_grf = syscon_node_to_regmap(node);
        if (IS_ERR(data->regmap_grf)) {
            return PTR_ERR(data->regmap_grf);
        }
    }

    regmap_read(data->regmap_grf, RK3328_GRF_OS_REG2, &val);
    data->dram_type = READ_DRAMTYPE_INFO(val);
    data->ch_msk = 1;
    data->clk = NULL;

    desc->ops = &rockchip_dfi_ops;

    return 0;
}

static const struct of_device_id rockchip_dfi_id_match[] = {
    {.compatible = "rockchip,px30-dfi", .data = px30_dfi_init},
    {.compatible = "rockchip,rk1808-dfi", .data = px30_dfi_init},
    {.compatible = "rockchip,rk3128-dfi", .data = rk3128_dfi_init},
    {.compatible = "rockchip,rk3288-dfi", .data = rk3288_dfi_init},
    {.compatible = "rockchip,rk3328-dfi", .data = rk3328_dfi_init},
    {.compatible = "rockchip,rk3368-dfi", .data = rk3368_dfi_init},
    {.compatible = "rockchip,rk3399-dfi", .data = rockchip_dfi_init},
    {.compatible = "rockchip,rk3568-dfi", .data = px30_dfi_init},
    {.compatible = "rockchip,rv1126-dfi", .data = px30_dfi_init},
    {},
};

static int rockchip_dfi_probe(struct platform_device *pdev)
{
    struct device *dev = &pdev->dev;
    struct rockchip_dfi *data;
    struct devfreq_event_desc *desc;
    struct device_node *np = pdev->dev.of_node;
    const struct of_device_id *match;
    int (*init)(struct platform_device * pdev, struct rockchip_dfi * data, struct devfreq_event_desc * desc);

    data = devm_kzalloc(dev, sizeof(struct rockchip_dfi), GFP_KERNEL);
    if (!data) {
        return -ENOMEM;
    }

    desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
    if (!desc) {
        return -ENOMEM;
    }

    match = of_match_node(rockchip_dfi_id_match, pdev->dev.of_node);
    if (match) {
        init = match->data;
        if (init) {
            if (init(pdev, data, desc)) {
                return -EINVAL;
            }
        } else {
            return 0;
        }
    } else {
        return 0;
    }

    desc->driver_data = data;
    desc->name = np->name;

    data->edev = devm_devfreq_event_add_edev(dev, desc);
    if (IS_ERR(data->edev)) {
        dev_err(dev, "failed to add devfreq-event device\n");
        return PTR_ERR(data->edev);
    }
    data->desc = desc;
    data->dev = &pdev->dev;

    platform_set_drvdata(pdev, data);

    return 0;
}

static struct platform_driver rockchip_dfi_driver = {
    .probe = rockchip_dfi_probe,
    .driver =
        {
            .name = "rockchip-dfi",
            .of_match_table = rockchip_dfi_id_match,
        },
};
module_platform_driver(rockchip_dfi_driver);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Lin Huang <hl@rock-chips.com>");
MODULE_DESCRIPTION("Rockchip DFI driver");