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242 lines
6.3 KiB
242 lines
6.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Renesas RZ/G2L TSU Thermal Sensor Driver |
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* |
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* Copyright (C) 2021 Renesas Electronics Corporation |
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*/ |
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#include <linux/delay.h> |
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#include <linux/err.h> |
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#include <linux/io.h> |
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#include <linux/iopoll.h> |
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#include <linux/math.h> |
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#include <linux/module.h> |
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#include <linux/of_device.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/reset.h> |
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#include <linux/thermal.h> |
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#include <linux/units.h> |
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#include "thermal_hwmon.h" |
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#define CTEMP_MASK 0xFFF |
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/* default calibration values, if FUSE values are missing */ |
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#define SW_CALIB0_VAL 3148 |
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#define SW_CALIB1_VAL 503 |
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/* Register offsets */ |
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#define TSU_SM 0x00 |
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#define TSU_ST 0x04 |
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#define TSU_SAD 0x0C |
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#define TSU_SS 0x10 |
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#define OTPTSUTRIM_REG(n) (0x18 + ((n) * 0x4)) |
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/* Sensor Mode Register(TSU_SM) */ |
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#define TSU_SM_EN_TS BIT(0) |
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#define TSU_SM_ADC_EN_TS BIT(1) |
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#define TSU_SM_NORMAL_MODE (TSU_SM_EN_TS | TSU_SM_ADC_EN_TS) |
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/* TSU_ST bits */ |
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#define TSU_ST_START BIT(0) |
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#define TSU_SS_CONV_RUNNING BIT(0) |
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#define TS_CODE_AVE_SCALE(x) ((x) * 1000000) |
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#define MCELSIUS(temp) ((temp) * MILLIDEGREE_PER_DEGREE) |
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#define TS_CODE_CAP_TIMES 8 /* Capture times */ |
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#define RZG2L_THERMAL_GRAN 500 /* milli Celsius */ |
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#define RZG2L_TSU_SS_TIMEOUT_US 1000 |
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#define CURVATURE_CORRECTION_CONST 13 |
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struct rzg2l_thermal_priv { |
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struct device *dev; |
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void __iomem *base; |
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struct thermal_zone_device *zone; |
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struct reset_control *rstc; |
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u32 calib0, calib1; |
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}; |
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static inline u32 rzg2l_thermal_read(struct rzg2l_thermal_priv *priv, u32 reg) |
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{ |
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return ioread32(priv->base + reg); |
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} |
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static inline void rzg2l_thermal_write(struct rzg2l_thermal_priv *priv, u32 reg, |
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u32 data) |
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{ |
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iowrite32(data, priv->base + reg); |
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} |
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static int rzg2l_thermal_get_temp(void *devdata, int *temp) |
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{ |
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struct rzg2l_thermal_priv *priv = devdata; |
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u32 result = 0, dsensor, ts_code_ave; |
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int val, i; |
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for (i = 0; i < TS_CODE_CAP_TIMES ; i++) { |
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/* TSU repeats measurement at 20 microseconds intervals and |
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* automatically updates the results of measurement. As per |
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* the HW manual for measuring temperature we need to read 8 |
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* values consecutively and then take the average. |
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* ts_code_ave = (ts_code[0] + ⋯ + ts_code[7]) / 8 |
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*/ |
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result += rzg2l_thermal_read(priv, TSU_SAD) & CTEMP_MASK; |
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usleep_range(20, 30); |
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} |
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ts_code_ave = result / TS_CODE_CAP_TIMES; |
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/* Calculate actual sensor value by applying curvature correction formula |
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* dsensor = ts_code_ave / (1 + ts_code_ave * 0.000013). Here we are doing |
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* integer calculation by scaling all the values by 1000000. |
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*/ |
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dsensor = TS_CODE_AVE_SCALE(ts_code_ave) / |
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(TS_CODE_AVE_SCALE(1) + (ts_code_ave * CURVATURE_CORRECTION_CONST)); |
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/* The temperature Tj is calculated by the formula |
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* Tj = (dsensor − calib1) * 165/ (calib0 − calib1) − 40 |
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* where calib0 and calib1 are the caliberation values. |
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*/ |
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val = ((dsensor - priv->calib1) * (MCELSIUS(165) / |
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(priv->calib0 - priv->calib1))) - MCELSIUS(40); |
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*temp = roundup(val, RZG2L_THERMAL_GRAN); |
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return 0; |
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} |
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static const struct thermal_zone_of_device_ops rzg2l_tz_of_ops = { |
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.get_temp = rzg2l_thermal_get_temp, |
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}; |
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static int rzg2l_thermal_init(struct rzg2l_thermal_priv *priv) |
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{ |
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u32 reg_val; |
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rzg2l_thermal_write(priv, TSU_SM, TSU_SM_NORMAL_MODE); |
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rzg2l_thermal_write(priv, TSU_ST, 0); |
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/* Before setting the START bit, TSU should be in normal operating |
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* mode. As per the HW manual, it will take 60 µs to place the TSU |
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* into normal operating mode. |
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*/ |
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usleep_range(60, 80); |
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reg_val = rzg2l_thermal_read(priv, TSU_ST); |
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reg_val |= TSU_ST_START; |
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rzg2l_thermal_write(priv, TSU_ST, reg_val); |
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return readl_poll_timeout(priv->base + TSU_SS, reg_val, |
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reg_val == TSU_SS_CONV_RUNNING, 50, |
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RZG2L_TSU_SS_TIMEOUT_US); |
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} |
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static void rzg2l_thermal_reset_assert_pm_disable_put(struct platform_device *pdev) |
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{ |
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struct rzg2l_thermal_priv *priv = dev_get_drvdata(&pdev->dev); |
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pm_runtime_put(&pdev->dev); |
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pm_runtime_disable(&pdev->dev); |
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reset_control_assert(priv->rstc); |
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} |
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static int rzg2l_thermal_remove(struct platform_device *pdev) |
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{ |
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struct rzg2l_thermal_priv *priv = dev_get_drvdata(&pdev->dev); |
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thermal_remove_hwmon_sysfs(priv->zone); |
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rzg2l_thermal_reset_assert_pm_disable_put(pdev); |
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return 0; |
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} |
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static int rzg2l_thermal_probe(struct platform_device *pdev) |
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{ |
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struct thermal_zone_device *zone; |
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struct rzg2l_thermal_priv *priv; |
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struct device *dev = &pdev->dev; |
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int ret; |
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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priv->base = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(priv->base)) |
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return PTR_ERR(priv->base); |
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priv->dev = dev; |
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priv->rstc = devm_reset_control_get_exclusive(dev, NULL); |
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if (IS_ERR(priv->rstc)) |
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return dev_err_probe(dev, PTR_ERR(priv->rstc), |
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"failed to get cpg reset"); |
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ret = reset_control_deassert(priv->rstc); |
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if (ret) |
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return dev_err_probe(dev, ret, "failed to deassert"); |
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pm_runtime_enable(dev); |
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pm_runtime_get_sync(dev); |
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priv->calib0 = rzg2l_thermal_read(priv, OTPTSUTRIM_REG(0)); |
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if (!priv->calib0) |
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priv->calib0 = SW_CALIB0_VAL; |
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priv->calib1 = rzg2l_thermal_read(priv, OTPTSUTRIM_REG(1)); |
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if (!priv->calib1) |
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priv->calib1 = SW_CALIB1_VAL; |
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platform_set_drvdata(pdev, priv); |
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ret = rzg2l_thermal_init(priv); |
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if (ret) { |
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dev_err(dev, "Failed to start TSU"); |
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goto err; |
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} |
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zone = devm_thermal_zone_of_sensor_register(dev, 0, priv, |
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&rzg2l_tz_of_ops); |
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if (IS_ERR(zone)) { |
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dev_err(dev, "Can't register thermal zone"); |
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ret = PTR_ERR(zone); |
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goto err; |
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} |
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priv->zone = zone; |
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priv->zone->tzp->no_hwmon = false; |
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ret = thermal_add_hwmon_sysfs(priv->zone); |
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if (ret) |
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goto err; |
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dev_dbg(dev, "TSU probed with %s caliberation values", |
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rzg2l_thermal_read(priv, OTPTSUTRIM_REG(0)) ? "hw" : "sw"); |
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return 0; |
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err: |
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rzg2l_thermal_reset_assert_pm_disable_put(pdev); |
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return ret; |
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} |
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static const struct of_device_id rzg2l_thermal_dt_ids[] = { |
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{ .compatible = "renesas,rzg2l-tsu", }, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(of, rzg2l_thermal_dt_ids); |
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static struct platform_driver rzg2l_thermal_driver = { |
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.driver = { |
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.name = "rzg2l_thermal", |
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.of_match_table = rzg2l_thermal_dt_ids, |
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}, |
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.probe = rzg2l_thermal_probe, |
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.remove = rzg2l_thermal_remove, |
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}; |
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module_platform_driver(rzg2l_thermal_driver); |
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MODULE_DESCRIPTION("Renesas RZ/G2L TSU Thermal Sensor Driver"); |
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MODULE_AUTHOR("Biju Das <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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