thermal/drivers/tango: Remove tango driver

The tango platform is getting removed, so the driver is no
longer needed.

Cc: Marc Gonzalez <marc.w.gonzalez@free.fr>
Cc: Mans Rullgard <mans@mansr.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Mans Rullgard <mans@mansr.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20210120162400.4115366-2-arnd@kernel.org

Documentation/devicetree/bindings/thermal/tango-thermal.txt

-* Tango Thermal
-
-The SMP8758 SoC includes 3 instances of this temperature sensor
-(in the CPU, video decoder, and PCIe controller).
-
-Required properties:
-- #thermal-sensor-cells: Should be 0 (see Documentation/devicetree/bindings/thermal/thermal-sensor.yaml)
-- compatible: "sigma,smp8758-thermal"
-- reg: Address range of the thermal registers
-
-Example:
-
-	cpu_temp: thermal@920100 {
-		#thermal-sensor-cells = <0>;
-		compatible = "sigma,smp8758-thermal";
-		reg = <0x920100 12>;
-	};

drivers/thermal/Kconfig

@@ -450,15 +450,6 @@ depends on (ARCH_STI || ARCH_STM32) && OF
 source "drivers/thermal/st/Kconfig"
 endmenu
 
-config TANGO_THERMAL
-	tristate "Tango thermal management"
-	depends on ARCH_TANGO || COMPILE_TEST
-	help
-	  Enable the Tango thermal driver, which supports the primitive
-	  temperature sensor embedded in Tango chips since the SMP8758.
-	  This sensor only generates a 1-bit signal to indicate whether
-	  the die temperature exceeds a programmable threshold.
-
 source "drivers/thermal/tegra/Kconfig"
 
 config GENERIC_ADC_THERMAL

drivers/thermal/Makefile

@@ -42,7 +42,6 @@ obj-y				+= samsung/
 obj-$(CONFIG_DOVE_THERMAL)  	+= dove_thermal.o
 obj-$(CONFIG_DB8500_THERMAL)	+= db8500_thermal.o
 obj-$(CONFIG_ARMADA_THERMAL)	+= armada_thermal.o
-obj-$(CONFIG_TANGO_THERMAL)	+= tango_thermal.o
 obj-$(CONFIG_IMX_THERMAL)	+= imx_thermal.o
 obj-$(CONFIG_IMX_SC_THERMAL)	+= imx_sc_thermal.o
 obj-$(CONFIG_IMX8MM_THERMAL)	+= imx8mm_thermal.o

drivers/thermal/tango_thermal.c

-// SPDX-License-Identifier: GPL-2.0-only
-#include <linux/io.h>
-#include <linux/delay.h>
-#include <linux/module.h>
-#include <linux/thermal.h>
-#include <linux/platform_device.h>
-
-/*
- * According to a data sheet draft, "this temperature sensor uses a bandgap
- * type of circuit to compare a voltage which has a negative temperature
- * coefficient with a voltage that is proportional to absolute temperature.
- * A resistor bank allows 41 different temperature thresholds to be selected
- * and the logic output will then indicate whether the actual die temperature
- * lies above or below the selected threshold."
- */
-
-#define TEMPSI_CMD	0
-#define TEMPSI_RES	4
-#define TEMPSI_CFG	8
-
-#define CMD_OFF		0
-#define CMD_ON		1
-#define CMD_READ	2
-
-#define IDX_MIN		15
-#define IDX_MAX		40
-
-struct tango_thermal_priv {
-	void __iomem *base;
-	int thresh_idx;
-};
-
-static bool temp_above_thresh(void __iomem *base, int thresh_idx)
-{
-	writel(CMD_READ | thresh_idx << 8, base + TEMPSI_CMD);
-	usleep_range(10, 20);
-	writel(CMD_READ | thresh_idx << 8, base + TEMPSI_CMD);
-
-	return readl(base + TEMPSI_RES);
-}
-
-static int tango_get_temp(void *arg, int *res)
-{
-	struct tango_thermal_priv *priv = arg;
-	int idx = priv->thresh_idx;
-
-	if (temp_above_thresh(priv->base, idx)) {
-		/* Search upward by incrementing thresh_idx */
-		while (idx < IDX_MAX && temp_above_thresh(priv->base, ++idx))
-			cpu_relax();
-		idx = idx - 1; /* always return lower bound */
-	} else {
-		/* Search downward by decrementing thresh_idx */
-		while (idx > IDX_MIN && !temp_above_thresh(priv->base, --idx))
-			cpu_relax();
-	}
-
-	*res = (idx * 9 / 2 - 38) * 1000; /* millidegrees Celsius */
-	priv->thresh_idx = idx;
-
-	return 0;
-}
-
-static const struct thermal_zone_of_device_ops ops = {
-	.get_temp	= tango_get_temp,
-};
-
-static void tango_thermal_init(struct tango_thermal_priv *priv)
-{
-	writel(0, priv->base + TEMPSI_CFG);
-	writel(CMD_ON, priv->base + TEMPSI_CMD);
-}
-
-static int tango_thermal_probe(struct platform_device *pdev)
-{
-	struct resource *res;
-	struct tango_thermal_priv *priv;
-	struct thermal_zone_device *tzdev;
-
-	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	priv->base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(priv->base))
-		return PTR_ERR(priv->base);
-
-	platform_set_drvdata(pdev, priv);
-	priv->thresh_idx = IDX_MIN;
-	tango_thermal_init(priv);
-
-	tzdev = devm_thermal_zone_of_sensor_register(&pdev->dev, 0, priv, &ops);
-	return PTR_ERR_OR_ZERO(tzdev);
-}
-
-static int __maybe_unused tango_thermal_resume(struct device *dev)
-{
-	tango_thermal_init(dev_get_drvdata(dev));
-	return 0;
-}
-
-static SIMPLE_DEV_PM_OPS(tango_thermal_pm, NULL, tango_thermal_resume);
-
-static const struct of_device_id tango_sensor_ids[] = {
-	{
-		.compatible = "sigma,smp8758-thermal",
-	},
-	{ /* sentinel */ }
-};
-MODULE_DEVICE_TABLE(of, tango_sensor_ids);
-
-static struct platform_driver tango_thermal_driver = {
-	.probe	= tango_thermal_probe,
-	.driver	= {
-		.name		= "tango-thermal",
-		.of_match_table	= tango_sensor_ids,
-		.pm		= &tango_thermal_pm,
-	},
-};
-
-module_platform_driver(tango_thermal_driver);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Sigma Designs");
-MODULE_DESCRIPTION("Tango temperature sensor");