target/linux/bcm27xx/patches-5.4/950-0758-thermal-Add-BCM2711-thermal-driver.patch

   1 From 84477b71c184345517625f5c3eccf26a29eac4df Mon Sep 17 00:00:00 2001
   2 From: Stefan Wahren <stefan.wahren@i2se.com>
   3 Date: Mon, 13 Jan 2020 19:56:16 +0100
   4 Subject: [PATCH] thermal: Add BCM2711 thermal driver
   5
   6 Commit 59b781352dc4cb9ae27a8ddae0cda979d29d8af7 upstream.
   7
   8 This adds the thermal sensor driver for the Broadcom BCM2711 SoC,
   9 which is placed on the Raspberry Pi 4. The driver only provides
  10 SoC temperature reading so far.
  11
  12 Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
  13 Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
  14 Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
  15 Tested-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
  16 Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
  17 Link: https://lore.kernel.org/r/1578941778-23321-3-git-send-email-stefan.wahren@i2se.com
  18 Signed-off-by: Chen-Yu Tsai <wens@csie.org>
  19 ---
  20  drivers/thermal/broadcom/Kconfig           |   7 ++
  21  drivers/thermal/broadcom/Makefile          |   1 +
  22  drivers/thermal/broadcom/bcm2711_thermal.c | 123 +++++++++++++++++++++
  23  3 files changed, 131 insertions(+)
  24  create mode 100644 drivers/thermal/broadcom/bcm2711_thermal.c
  25
  26 --- a/drivers/thermal/broadcom/Kconfig
  27 +++ b/drivers/thermal/broadcom/Kconfig
  28 @@ -1,4 +1,11 @@
  29  # SPDX-License-Identifier: GPL-2.0-only
  30 +config BCM2711_THERMAL
  31 +       tristate "Broadcom AVS RO thermal sensor driver"
  32 +       depends on ARCH_BCM2835 || COMPILE_TEST
  33 +       depends on THERMAL_OF && MFD_SYSCON
  34 +       help
  35 +         Support for thermal sensors on Broadcom BCM2711 SoCs.
  36 +
  37  config BCM2835_THERMAL
  38         tristate "Thermal sensors on bcm2835 SoC"
  39         depends on ARCH_BCM2835 || COMPILE_TEST
  40 --- a/drivers/thermal/broadcom/Makefile
  41 +++ b/drivers/thermal/broadcom/Makefile
  42 @@ -1,4 +1,5 @@
  43  # SPDX-License-Identifier: GPL-2.0-only
  44 +obj-$(CONFIG_BCM2711_THERMAL)          += bcm2711_thermal.o
  45  obj-$(CONFIG_BCM2835_THERMAL)          += bcm2835_thermal.o
  46  obj-$(CONFIG_BRCMSTB_THERMAL)          += brcmstb_thermal.o
  47  obj-$(CONFIG_BCM_NS_THERMAL)           += ns-thermal.o
  48 --- /dev/null
  49 +++ b/drivers/thermal/broadcom/bcm2711_thermal.c
  50 @@ -0,0 +1,123 @@
  51 +// SPDX-License-Identifier: GPL-2.0+
  52 +/*
  53 + * Broadcom AVS RO thermal sensor driver
  54 + *
  55 + * based on brcmstb_thermal
  56 + *
  57 + * Copyright (C) 2020 Stefan Wahren
  58 + */
  59 +
  60 +#include <linux/bitops.h>
  61 +#include <linux/clk.h>
  62 +#include <linux/device.h>
  63 +#include <linux/err.h>
  64 +#include <linux/io.h>
  65 +#include <linux/kernel.h>
  66 +#include <linux/mfd/syscon.h>
  67 +#include <linux/module.h>
  68 +#include <linux/platform_device.h>
  69 +#include <linux/of_device.h>
  70 +#include <linux/regmap.h>
  71 +#include <linux/thermal.h>
  72 +
  73 +#include "../thermal_hwmon.h"
  74 +
  75 +#define AVS_RO_TEMP_STATUS             0x200
  76 +#define AVS_RO_TEMP_STATUS_VALID_MSK   (BIT(16) | BIT(10))
  77 +#define AVS_RO_TEMP_STATUS_DATA_MSK    GENMASK(9, 0)
  78 +
  79 +struct bcm2711_thermal_priv {
  80 +       struct regmap *regmap;
  81 +       struct thermal_zone_device *thermal;
  82 +};
  83 +
  84 +static int bcm2711_get_temp(void *data, int *temp)
  85 +{
  86 +       struct bcm2711_thermal_priv *priv = data;
  87 +       int slope = thermal_zone_get_slope(priv->thermal);
  88 +       int offset = thermal_zone_get_offset(priv->thermal);
  89 +       u32 val;
  90 +       int ret;
  91 +       long t;
  92 +
  93 +       ret = regmap_read(priv->regmap, AVS_RO_TEMP_STATUS, &val);
  94 +       if (ret)
  95 +               return ret;
  96 +
  97 +       if (!(val & AVS_RO_TEMP_STATUS_VALID_MSK))
  98 +               return -EIO;
  99 +
 100 +       val &= AVS_RO_TEMP_STATUS_DATA_MSK;
 101 +
 102 +       /* Convert a HW code to a temperature reading (millidegree celsius) */
 103 +       t = slope * val + offset;
 104 +
 105 +       *temp = t < 0 ? 0 : t;
 106 +
 107 +       return 0;
 108 +}
 109 +
 110 +static const struct thermal_zone_of_device_ops bcm2711_thermal_of_ops = {
 111 +       .get_temp       = bcm2711_get_temp,
 112 +};
 113 +
 114 +static const struct of_device_id bcm2711_thermal_id_table[] = {
 115 +       { .compatible = "brcm,bcm2711-thermal" },
 116 +       {},
 117 +};
 118 +MODULE_DEVICE_TABLE(of, bcm2711_thermal_id_table);
 119 +
 120 +static int bcm2711_thermal_probe(struct platform_device *pdev)
 121 +{
 122 +       struct thermal_zone_device *thermal;
 123 +       struct bcm2711_thermal_priv *priv;
 124 +       struct device *dev = &pdev->dev;
 125 +       struct device_node *parent;
 126 +       struct regmap *regmap;
 127 +       int ret;
 128 +
 129 +       priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 130 +       if (!priv)
 131 +               return -ENOMEM;
 132 +
 133 +       /* get regmap from syscon node */
 134 +       parent = of_get_parent(dev->of_node); /* parent should be syscon node */
 135 +       regmap = syscon_node_to_regmap(parent);
 136 +       of_node_put(parent);
 137 +       if (IS_ERR(regmap)) {
 138 +               ret = PTR_ERR(regmap);
 139 +               dev_err(dev, "failed to get regmap: %d\n", ret);
 140 +               return ret;
 141 +       }
 142 +       priv->regmap = regmap;
 143 +
 144 +       thermal = devm_thermal_zone_of_sensor_register(dev, 0, priv,
 145 +                                                      &bcm2711_thermal_of_ops);
 146 +       if (IS_ERR(thermal)) {
 147 +               ret = PTR_ERR(thermal);
 148 +               dev_err(dev, "could not register sensor: %d\n", ret);
 149 +               return ret;
 150 +       }
 151 +
 152 +       priv->thermal = thermal;
 153 +
 154 +       thermal->tzp->no_hwmon = false;
 155 +       ret = thermal_add_hwmon_sysfs(thermal);
 156 +       if (ret)
 157 +               return ret;
 158 +
 159 +       return 0;
 160 +}
 161 +
 162 +static struct platform_driver bcm2711_thermal_driver = {
 163 +       .probe = bcm2711_thermal_probe,
 164 +       .driver = {
 165 +               .name = "bcm2711_thermal",
 166 +               .of_match_table = bcm2711_thermal_id_table,
 167 +       },
 168 +};
 169 +module_platform_driver(bcm2711_thermal_driver);
 170 +
 171 +MODULE_LICENSE("GPL");
 172 +MODULE_AUTHOR("Stefan Wahren");
 173 +MODULE_DESCRIPTION("Broadcom AVS RO thermal sensor driver");