diff options
Diffstat (limited to 'drivers/thermal/imx_thermal.c')
| -rw-r--r-- | drivers/thermal/imx_thermal.c | 104 |
1 files changed, 74 insertions, 30 deletions
diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c index 4798b4b1fd77..e7d4ffc3de7f 100644 --- a/drivers/thermal/imx_thermal.c +++ b/drivers/thermal/imx_thermal.c @@ -25,6 +25,7 @@ #include <linux/slab.h> #include <linux/thermal.h> #include <linux/types.h> +#include <linux/nvmem-consumer.h> #define REG_SET 0x4 #define REG_CLR 0x8 @@ -94,7 +95,7 @@ struct imx_thermal_data { struct thermal_cooling_device *cdev; enum thermal_device_mode mode; struct regmap *tempmon; - u32 c1, c2; /* See formula in imx_get_sensor_data() */ + u32 c1, c2; /* See formula in imx_init_calib() */ int temp_passive; int temp_critical; int temp_max; @@ -177,7 +178,7 @@ static int imx_get_temp(struct thermal_zone_device *tz, int *temp) n_meas = (val & TEMPSENSE0_TEMP_CNT_MASK) >> TEMPSENSE0_TEMP_CNT_SHIFT; - /* See imx_get_sensor_data() for formula derivation */ + /* See imx_init_calib() for formula derivation */ *temp = data->c2 - n_meas * data->c1; /* Update alarm value to next higher trip point for TEMPMON_IMX6Q */ @@ -346,29 +347,12 @@ static struct thermal_zone_device_ops imx_tz_ops = { .set_trip_temp = imx_set_trip_temp, }; -static int imx_get_sensor_data(struct platform_device *pdev) +static int imx_init_calib(struct platform_device *pdev, u32 val) { struct imx_thermal_data *data = platform_get_drvdata(pdev); - struct regmap *map; int t1, n1; - int ret; - u32 val; u64 temp64; - map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, - "fsl,tempmon-data"); - if (IS_ERR(map)) { - ret = PTR_ERR(map); - dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret); - return ret; - } - - ret = regmap_read(map, OCOTP_ANA1, &val); - if (ret) { - dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret); - return ret; - } - if (val == 0 || val == ~0) { dev_err(&pdev->dev, "invalid sensor calibration data\n"); return -EINVAL; @@ -405,12 +389,12 @@ static int imx_get_sensor_data(struct platform_device *pdev) data->c1 = temp64; data->c2 = n1 * data->c1 + 1000 * t1; - /* use OTP for thermal grade */ - ret = regmap_read(map, OCOTP_MEM0, &val); - if (ret) { - dev_err(&pdev->dev, "failed to read temp grade: %d\n", ret); - return ret; - } + return 0; +} + +static void imx_init_temp_grade(struct platform_device *pdev, u32 val) +{ + struct imx_thermal_data *data = platform_get_drvdata(pdev); /* The maximum die temp is specified by the Temperature Grade */ switch ((val >> 6) & 0x3) { @@ -438,6 +422,55 @@ static int imx_get_sensor_data(struct platform_device *pdev) */ data->temp_critical = data->temp_max - (1000 * 5); data->temp_passive = data->temp_max - (1000 * 10); +} + +static int imx_init_from_tempmon_data(struct platform_device *pdev) +{ + struct regmap *map; + int ret; + u32 val; + + map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, + "fsl,tempmon-data"); + if (IS_ERR(map)) { + ret = PTR_ERR(map); + dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret); + return ret; + } + + ret = regmap_read(map, OCOTP_ANA1, &val); + if (ret) { + dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret); + return ret; + } + ret = imx_init_calib(pdev, val); + if (ret) + return ret; + + ret = regmap_read(map, OCOTP_MEM0, &val); + if (ret) { + dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret); + return ret; + } + imx_init_temp_grade(pdev, val); + + return 0; +} + +static int imx_init_from_nvmem_cells(struct platform_device *pdev) +{ + int ret; + u32 val; + + ret = nvmem_cell_read_u32(&pdev->dev, "calib", &val); + if (ret) + return ret; + imx_init_calib(pdev, val); + + ret = nvmem_cell_read_u32(&pdev->dev, "temp_grade", &val); + if (ret) + return ret; + imx_init_temp_grade(pdev, val); return 0; } @@ -514,10 +547,21 @@ static int imx_thermal_probe(struct platform_device *pdev) platform_set_drvdata(pdev, data); - ret = imx_get_sensor_data(pdev); - if (ret) { - dev_err(&pdev->dev, "failed to get sensor data\n"); - return ret; + if (of_find_property(pdev->dev.of_node, "nvmem-cells", NULL)) { + ret = imx_init_from_nvmem_cells(pdev); + if (ret == -EPROBE_DEFER) + return ret; + if (ret) { + dev_err(&pdev->dev, "failed to init from nvmem: %d\n", + ret); + return ret; + } + } else { + ret = imx_init_from_tempmon_data(pdev); + if (ret) { + dev_err(&pdev->dev, "failed to init from from fsl,tempmon-data\n"); + return ret; + } } /* Make sure sensor is in known good state for measurements */ |