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239 lines
6.1 KiB
239 lines
6.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd |
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* Author: Lin Huang <[email protected]> |
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*/ |
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#include <linux/clk.h> |
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#include <linux/devfreq-event.h> |
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#include <linux/kernel.h> |
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#include <linux/err.h> |
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#include <linux/init.h> |
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#include <linux/io.h> |
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#include <linux/mfd/syscon.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/regmap.h> |
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#include <linux/slab.h> |
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#include <linux/list.h> |
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#include <linux/of.h> |
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#include <soc/rockchip/rk3399_grf.h> |
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#define RK3399_DMC_NUM_CH 2 |
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/* DDRMON_CTRL */ |
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#define DDRMON_CTRL 0x04 |
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#define CLR_DDRMON_CTRL (0x1f0000 << 0) |
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#define LPDDR4_EN (0x10001 << 4) |
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#define HARDWARE_EN (0x10001 << 3) |
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#define LPDDR3_EN (0x10001 << 2) |
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#define SOFTWARE_EN (0x10001 << 1) |
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#define SOFTWARE_DIS (0x10000 << 1) |
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#define TIME_CNT_EN (0x10001 << 0) |
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#define DDRMON_CH0_COUNT_NUM 0x28 |
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#define DDRMON_CH0_DFI_ACCESS_NUM 0x2c |
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#define DDRMON_CH1_COUNT_NUM 0x3c |
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#define DDRMON_CH1_DFI_ACCESS_NUM 0x40 |
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struct dmc_usage { |
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u32 access; |
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u32 total; |
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}; |
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/* |
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* The dfi controller can monitor DDR load. It has an upper and lower threshold |
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* for the operating points. Whenever the usage leaves these bounds an event is |
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* generated to indicate the DDR frequency should be changed. |
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*/ |
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struct rockchip_dfi { |
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struct devfreq_event_dev *edev; |
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struct devfreq_event_desc *desc; |
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struct dmc_usage ch_usage[RK3399_DMC_NUM_CH]; |
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struct device *dev; |
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void __iomem *regs; |
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struct regmap *regmap_pmu; |
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struct clk *clk; |
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}; |
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static void rockchip_dfi_start_hardware_counter(struct devfreq_event_dev *edev) |
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{ |
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struct rockchip_dfi *info = devfreq_event_get_drvdata(edev); |
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void __iomem *dfi_regs = info->regs; |
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u32 val; |
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u32 ddr_type; |
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/* get ddr type */ |
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regmap_read(info->regmap_pmu, RK3399_PMUGRF_OS_REG2, &val); |
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ddr_type = (val >> RK3399_PMUGRF_DDRTYPE_SHIFT) & |
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RK3399_PMUGRF_DDRTYPE_MASK; |
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/* clear DDRMON_CTRL setting */ |
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writel_relaxed(CLR_DDRMON_CTRL, dfi_regs + DDRMON_CTRL); |
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/* set ddr type to dfi */ |
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if (ddr_type == RK3399_PMUGRF_DDRTYPE_LPDDR3) |
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writel_relaxed(LPDDR3_EN, dfi_regs + DDRMON_CTRL); |
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else if (ddr_type == RK3399_PMUGRF_DDRTYPE_LPDDR4) |
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writel_relaxed(LPDDR4_EN, dfi_regs + DDRMON_CTRL); |
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/* enable count, use software mode */ |
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writel_relaxed(SOFTWARE_EN, dfi_regs + DDRMON_CTRL); |
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} |
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static void rockchip_dfi_stop_hardware_counter(struct devfreq_event_dev *edev) |
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{ |
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struct rockchip_dfi *info = devfreq_event_get_drvdata(edev); |
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void __iomem *dfi_regs = info->regs; |
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writel_relaxed(SOFTWARE_DIS, dfi_regs + DDRMON_CTRL); |
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} |
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static int rockchip_dfi_get_busier_ch(struct devfreq_event_dev *edev) |
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{ |
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struct rockchip_dfi *info = devfreq_event_get_drvdata(edev); |
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u32 tmp, max = 0; |
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u32 i, busier_ch = 0; |
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void __iomem *dfi_regs = info->regs; |
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rockchip_dfi_stop_hardware_counter(edev); |
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/* Find out which channel is busier */ |
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for (i = 0; i < RK3399_DMC_NUM_CH; i++) { |
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info->ch_usage[i].access = readl_relaxed(dfi_regs + |
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DDRMON_CH0_DFI_ACCESS_NUM + i * 20) * 4; |
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info->ch_usage[i].total = readl_relaxed(dfi_regs + |
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DDRMON_CH0_COUNT_NUM + i * 20); |
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tmp = info->ch_usage[i].access; |
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if (tmp > max) { |
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busier_ch = i; |
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max = tmp; |
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} |
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} |
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rockchip_dfi_start_hardware_counter(edev); |
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return busier_ch; |
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} |
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static int rockchip_dfi_disable(struct devfreq_event_dev *edev) |
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{ |
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struct rockchip_dfi *info = devfreq_event_get_drvdata(edev); |
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rockchip_dfi_stop_hardware_counter(edev); |
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clk_disable_unprepare(info->clk); |
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return 0; |
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} |
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static int rockchip_dfi_enable(struct devfreq_event_dev *edev) |
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{ |
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struct rockchip_dfi *info = devfreq_event_get_drvdata(edev); |
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int ret; |
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ret = clk_prepare_enable(info->clk); |
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if (ret) { |
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dev_err(&edev->dev, "failed to enable dfi clk: %d\n", ret); |
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return ret; |
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} |
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rockchip_dfi_start_hardware_counter(edev); |
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return 0; |
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} |
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static int rockchip_dfi_set_event(struct devfreq_event_dev *edev) |
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{ |
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return 0; |
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} |
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static int rockchip_dfi_get_event(struct devfreq_event_dev *edev, |
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struct devfreq_event_data *edata) |
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{ |
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struct rockchip_dfi *info = devfreq_event_get_drvdata(edev); |
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int busier_ch; |
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busier_ch = rockchip_dfi_get_busier_ch(edev); |
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edata->load_count = info->ch_usage[busier_ch].access; |
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edata->total_count = info->ch_usage[busier_ch].total; |
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return 0; |
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} |
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static const struct devfreq_event_ops rockchip_dfi_ops = { |
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.disable = rockchip_dfi_disable, |
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.enable = rockchip_dfi_enable, |
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.get_event = rockchip_dfi_get_event, |
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.set_event = rockchip_dfi_set_event, |
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}; |
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static const struct of_device_id rockchip_dfi_id_match[] = { |
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{ .compatible = "rockchip,rk3399-dfi" }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, rockchip_dfi_id_match); |
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static int rockchip_dfi_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct rockchip_dfi *data; |
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struct devfreq_event_desc *desc; |
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struct device_node *np = pdev->dev.of_node, *node; |
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data = devm_kzalloc(dev, sizeof(struct rockchip_dfi), GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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data->regs = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(data->regs)) |
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return PTR_ERR(data->regs); |
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data->clk = devm_clk_get(dev, "pclk_ddr_mon"); |
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if (IS_ERR(data->clk)) { |
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dev_err(dev, "Cannot get the clk dmc_clk\n"); |
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return PTR_ERR(data->clk); |
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} |
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/* try to find the optional reference to the pmu syscon */ |
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node = of_parse_phandle(np, "rockchip,pmu", 0); |
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if (node) { |
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data->regmap_pmu = syscon_node_to_regmap(node); |
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of_node_put(node); |
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if (IS_ERR(data->regmap_pmu)) |
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return PTR_ERR(data->regmap_pmu); |
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} |
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data->dev = dev; |
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desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL); |
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if (!desc) |
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return -ENOMEM; |
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desc->ops = &rockchip_dfi_ops; |
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desc->driver_data = data; |
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desc->name = np->name; |
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data->desc = desc; |
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data->edev = devm_devfreq_event_add_edev(&pdev->dev, desc); |
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if (IS_ERR(data->edev)) { |
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dev_err(&pdev->dev, |
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"failed to add devfreq-event device\n"); |
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return PTR_ERR(data->edev); |
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} |
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platform_set_drvdata(pdev, data); |
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return 0; |
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} |
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static struct platform_driver rockchip_dfi_driver = { |
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.probe = rockchip_dfi_probe, |
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.driver = { |
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.name = "rockchip-dfi", |
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.of_match_table = rockchip_dfi_id_match, |
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}, |
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}; |
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module_platform_driver(rockchip_dfi_driver); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_AUTHOR("Lin Huang <[email protected]>"); |
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MODULE_DESCRIPTION("Rockchip DFI driver");
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