hwmon: Remove generic pwm tachometer

Remove HW monitor based generic PWM tachometer
driver as it is not required.

Along with driver, remove DT binding document and
dkms entry.

Bug 4061216

Change-Id: I28e1bf9d5223ad7f56332d90501ea7ddb55cd366
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2883862
Reviewed-by: Jonathan Hunter <jonathanh@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>

Documentation/devicetree/bindings/hwmon/generic-pwm-tachometer.yaml

@@ -1,46 +0,0 @@
-# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
-%YAML 1.2
----
-$id: http://devicetree.org/schemas/hwmon/generic-pwm-tachometer.yaml#
-$schema: http://devicetree.org/meta-schemas/core.yaml#
-
-title: Generic PWM based tachometer HW monitor driver
-
-maintainers:
-  - Laxman Dewangan <ldewangan@nvidia.com>
-
-description: |
-  Generic PWM based tachometer driver which captures the PWM signal and reports
-  the speed of the device which generates the PWM signal. This helps in monitor
-  the speed of fan.
-
-properties:
-  compatible:
-    enum:
-      - generic-pwm-tachometer
-
-  pwms:
-    maxItems: 1
-    description: |
-      This property contains the phandle of the PWM controller which capture the
-      PWM signal.
-
-required:
-  - compatible
-  - pwms
-
-additionalProperties: false
-
-examples:
-  - |
-    tegra_tachometer: tachometer@39c0000 {
-       reg = <0x39c0000 0x0>;
-       #pwm-cells = <2>;
-       /* Other properties of tachometer */
-    };
-
-    generic_pwm_tachometer {
-       compatible = "generic-pwm-tachometer";
-       pwms = <&tegra_tachometer 0 1000000>;
-    };
-...

dkms.conf

@@ -111,12 +111,8 @@ BUILT_MODULE_NAME[26]="pinctrl-tegra234-dpaux"
 BUILT_MODULE_LOCATION[26]="drivers/pinctrl"
 DEST_MODULE_LOCATION[26]="/extra"
 
-BUILT_MODULE_NAME[27]="generic-pwm-tachometer"
+BUILT_MODULE_NAME[27]="cpuidle-debugfs"
-BUILT_MODULE_LOCATION[27]="drivers/hwmon"
+BUILT_MODULE_LOCATION[27]="drivers/cpuidle"
 DEST_MODULE_LOCATION[27]="/extra"
 
-BUILT_MODULE_NAME[28]="cpuidle-debugfs"
-BUILT_MODULE_LOCATION[28]="drivers/cpuidle"
-DEST_MODULE_LOCATION[28]="/extra"
-
 AUTO_INSTALL="yes"

drivers/Makefile

@@ -22,7 +22,6 @@ obj-m += firmware/tegra/
 ifdef CONFIG_TEGRA_HOST1X
 obj-m += gpu/
 endif
-obj-m += hwmon/
 ifdef CONFIG_I2C
 obj-m += i2c/busses/
 obj-m += mfd/

drivers/hwmon/Makefile

@@ -1,4 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-# Copyright (c) 2022, NVIDIA CORPORATION.  All rights reserved.
-
-obj-m += generic-pwm-tachometer.o

drivers/hwmon/generic-pwm-tachometer.c

@@ -1,97 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-// Copyright (c) 2022, NVIDIA CORPORATION.  All rights reserved.
-
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/err.h>
-#include <linux/pwm.h>
-#include <linux/hwmon.h>
-#include <linux/hwmon-sysfs.h>
-
-struct pwm_hwmon_tach {
-	struct device		*dev;
-	struct pwm_device	*pwm;
-	struct device		*hwmon;
-};
-
-static ssize_t show_rpm(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	struct pwm_hwmon_tach *ptt = dev_get_drvdata(dev);
-	struct pwm_device *pwm = ptt->pwm;
-	struct pwm_capture result;
-	unsigned int rpm = 0;
-	int ret;
-
-	ret = pwm_capture(pwm, &result, 0);
-	if (ret < 0) {
-		dev_err(ptt->dev, "Failed to capture PWM: %d\n", ret);
-		return ret;
-	}
-
-	if (result.period)
-		rpm = DIV_ROUND_CLOSEST_ULL(60ULL * NSEC_PER_SEC,
-					    result.period);
-
-	return sprintf(buf, "%u\n", rpm);
-}
-static SENSOR_DEVICE_ATTR(rpm, 0444, show_rpm, NULL, 0);
-
-static struct attribute *pwm_tach_attrs[] = {
-	&sensor_dev_attr_rpm.dev_attr.attr,
-	NULL,
-};
-ATTRIBUTE_GROUPS(pwm_tach);
-
-static int pwm_tach_probe(struct platform_device *pdev)
-{
-	struct pwm_hwmon_tach *ptt;
-
-	ptt = devm_kzalloc(&pdev->dev, sizeof(*ptt), GFP_KERNEL);
-	if (!ptt)
-		return -ENOMEM;
-
-	ptt->dev = &pdev->dev;
-
-	platform_set_drvdata(pdev, ptt);
-	dev_set_drvdata(&pdev->dev, ptt);
-
-	ptt->pwm = devm_fwnode_pwm_get(&pdev->dev, &pdev->dev.of_node->fwnode, NULL);
-	if (IS_ERR(ptt->pwm)) {
-		if (PTR_ERR(ptt->pwm) != -EPROBE_DEFER) {
-			dev_err(&pdev->dev, "Failed to get pwm:  %ld\n",
-				PTR_ERR(ptt->pwm));
-		}
-		return PTR_ERR(ptt->pwm);
-	}
-
-	ptt->hwmon = devm_hwmon_device_register_with_groups(&pdev->dev,
-					 "pwm_tach", ptt, pwm_tach_groups);
-	if (IS_ERR(ptt->hwmon)) {
-		dev_err(&pdev->dev, "Failed to register hwmon device: %d\n",
-			PTR_ERR_OR_ZERO(ptt->hwmon));
-		return PTR_ERR_OR_ZERO(ptt->hwmon);
-	}
-
-	return 0;
-}
-
-static const struct of_device_id pwm_tach_of_match[] = {
-	{ .compatible = "generic-pwm-tachometer" },
-	{}
-};
-MODULE_DEVICE_TABLE(of, pwm_tach_of_match);
-
-static struct platform_driver pwm_tach_driver = {
-	.driver = {
-		.name = "generic-pwm-tachometer",
-		.of_match_table = pwm_tach_of_match,
-	},
-	.probe = pwm_tach_probe,
-};
-
-module_platform_driver(pwm_tach_driver);
-
-MODULE_DESCRIPTION("PWM based Generic Tachometer driver");
-MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
-MODULE_AUTHOR("R Raj Kumar <rrajk@nvidia.com>");
-MODULE_LICENSE("GPL v2");