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Commit 73f8f06d authored by Anil kumar mamidala's avatar Anil kumar mamidala Committed by Murali Nalajala
Browse files

msm: ext-buck-support: add external buck support driver 



Based on the dt file entry enables the external buck support
for sending active set and sleep set votes to turn-on and turn-off
external buck by toggling a gpio when the system is going PC.

CRs-fixed: 568380
Change-Id: I8babf39f71a94daea2ba256d677f9a9f2bb77c30
Signed-off-by: default avatarAnil kumar mamidala <amami@codeaurora.org>
parent 73116956

Documentation/devicetree/bindings/arm/msm/ext-buck-control.txt

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* MSM EXT BUCK REGULATOR CONTROL



External buck regulator is used to power up the APC rail.

This buck can be turn-on & turn-off by toggling a gpio

line which is connected to buck enable pin. This driver

control the external regulator behaviour with the help

of RPM by sending the sleep and active sets when APPS

decide to enter into low power state with RPM assisted.



The required properties for EXT BUCK CONTROL are:



- compatible: "qcom,ext-buck-control"



The optional properties are:

- qcom,gpio-num: Indicates the GPIO number which will turn-on and turn-off

		 the external buck.

- qcom,settling-time-us: Indicates the settling time for the external buck to

			 get turn-on or turn-off. Settling time is calculated

			 in terms of QTIMER(19.2MHz) and the value is in us.



Example:

	qcom,ext-buck-control {

		compatible = "qcom,ext-buck-control";

		qcom,gpio-num = <50>;

		qcom,settling-time-us = <2580>;

};

arch/arm/mach-msm/Makefile

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@@ -55,6 +55,7 @@ obj-$(CONFIG_ARCH_MSM8610) += board-8610.o board-8610-gpiomux.o 
obj-$(CONFIG_ARCH_MSM8610) += clock-8610.o

obj-$(CONFIG_ARCH_MSM8610) += clock-dsi-8610.o

obj-$(CONFIG_ARCH_MDM9630) += clock-9630.o

obj-$(CONFIG_MSM_PM) += ext-buck-control.o



CFLAGS_msm_vibrator.o += -Idrivers/staging/android

arch/arm/mach-msm/ext-buck-control.c

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/* Copyright (c) 2014, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

 * only version 2 as published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 */



#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/platform_device.h>

#include <linux/of_platform.h>

#include <soc/qcom/rpm-smd.h>



#define RPM_REQUEST_TYPE_GPIO  0x6f697067 /* gpio */

#define RPM_GPIO_NUMB_KEY      0x626d756e /* numb */

#define RPM_GPIO_STAT_KEY      0x74617473 /* stat */

#define RPM_GPIO_SETT_KEY      0x74746573 /* sett */

#define RPM_GPIO_RESOURCE_ID   3

#define GPIO_ON                1

#define GPIO_OFF               0



static int msm_send_ext_buck_votes(int gpio_num, int settling_time)

{

	int rc;

	int gpio_status_sleep = GPIO_OFF;

	int gpio_status_active = GPIO_ON;



	struct msm_rpm_kvp kvp_sleep[] = {

		{

			.key = RPM_GPIO_STAT_KEY,

			.data = (void *)&gpio_status_sleep,

			.length = sizeof(gpio_status_sleep),

		}

	};



	struct msm_rpm_kvp kvp_active[] = {

		{

			.key = RPM_GPIO_NUMB_KEY,

			.data = (void *)&gpio_num,

			.length = sizeof(gpio_num),

		},

		{

			.key = RPM_GPIO_STAT_KEY,

			.data = (void *)&gpio_status_active,

			.length = sizeof(gpio_status_active),

		},

		{

			.key = RPM_GPIO_SETT_KEY,

			.data = (void *)&settling_time,

			.length = sizeof(settling_time),

		},

	};



	rc = msm_rpm_send_message(MSM_RPM_CTX_ACTIVE_SET,

		RPM_REQUEST_TYPE_GPIO, RPM_GPIO_RESOURCE_ID, kvp_active,

							ARRAY_SIZE(kvp_active));

	WARN(rc < 0, "RPM GPIO toggling (active set) did not enable!\n");



	rc = msm_rpm_send_message(MSM_RPM_CTX_SLEEP_SET,

		RPM_REQUEST_TYPE_GPIO, RPM_GPIO_RESOURCE_ID, kvp_sleep,

							ARRAY_SIZE(kvp_sleep));

	WARN(rc < 0, "RPM GPIO toggling (sleep set) did not enable!\n");



	return rc;

}



static int msm_ext_buck_probe(struct platform_device *pdev)

{

	char *key = NULL;

	int gpio_num;

	int settling_time_us;

	int ret = 0;



	key = "qcom,gpio-num";

	ret = of_property_read_u32(pdev->dev.of_node, key, &gpio_num);

	if (ret) {

		pr_err("%s: Cannot read %s from dt (ret:%d)\n",

						__func__, key, ret);

		return ret;

	}



	key = "qcom,settling-time-us";

	ret = of_property_read_u32(pdev->dev.of_node, key,

					&settling_time_us);

	if (ret) {

		pr_err("%s: Cannot read %s from dt (ret:%d)\n",

						__func__, key, ret);

		return ret;

	}



	ret = msm_send_ext_buck_votes(gpio_num, settling_time_us);



	return ret;

}



static struct of_device_id msm_ext_buck_table[] = {

	{.compatible = "qcom,ext-buck-control"},

	{},

};



static struct platform_driver msm_ext_buck_driver = {

	.probe = msm_ext_buck_probe,

	.driver = {

		.name = "ext-buck-control",

		.owner = THIS_MODULE,

		.of_match_table = msm_ext_buck_table,

	},

};



static int __init msm_ext_buck_init(void)

{

	return platform_driver_register(&msm_ext_buck_driver);

}

late_initcall(msm_ext_buck_init);