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Commit 832b9f66 authored by Prateek Sood's avatar Prateek Sood Committed by Gerrit - the friendly Code Review server
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soc: qcom: Add support for phy clock voting from eud 



Add support for phy clock voting from eud driver.
This is required to avoid unclocked access to
eud registers.

Change-Id: If8fe09679a5dea2ec74b39cfbc54fac295db362b
Signed-off-by: default avatarPrateek Sood <prsood@codeaurora.org>
parent 7e86f427

Documentation/devicetree/bindings/soc/qcom/qcom,msm-eud.txt

+1 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ Required properties: 
Optional properties:

 - reg-names: Can be "eud_mode_mgr2" for secure eud

 - qcom,secure-eud-en: To enable secure eud

 - qcom,eud-clock-vote-req: To enable clock voting from eud



Driver notifies clients via extcon for VBUS spoof attach/detach

and charger enable/disable events. Clients registered for these

drivers/soc/qcom/eud.c

+59 −2
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ 
#include <linux/tty_flip.h>

#include <linux/serial_core.h>

#include <linux/serial.h>

#include <linux/clk.h>

#include <linux/workqueue.h>

#include <linux/power_supply.h>

#include <soc/qcom/scm.h>
@@ -75,7 +76,9 @@ struct eud_chip { 
	struct work_struct		eud_work;

	struct power_supply		*batt_psy;

	bool				secure_eud_en;

	bool				need_phy_clk_vote;

	phys_addr_t			eud_mode_mgr2_phys_base;

	struct clk			*eud_ahb2phy_clk;

};



static const unsigned int eud_extcon_cable[] = {
@@ -505,6 +508,31 @@ static irqreturn_t handle_eud_irq(int irq, void *data) 
	return IRQ_HANDLED;

}



static int msm_eud_suspend(struct device *dev)

{

	struct eud_chip *chip = (struct eud_chip *)dev_get_drvdata(dev);



	if (chip->need_phy_clk_vote && chip->eud_ahb2phy_clk)

		clk_disable_unprepare(chip->eud_ahb2phy_clk);



	return 0;

}



static int msm_eud_resume(struct device *dev)

{

	struct eud_chip *chip = (struct eud_chip *)dev_get_drvdata(dev);

	int ret = 0;



	if (chip->need_phy_clk_vote && chip->eud_ahb2phy_clk) {

		ret = clk_prepare_enable(chip->eud_ahb2phy_clk);

		if (ret)

			dev_err(chip->dev, "%s failed to vote ahb2phy clk %d\n",

					__func__, ret);

	}



	return 0;

}



static int msm_eud_probe(struct platform_device *pdev)

{

	struct eud_chip *chip;
@@ -562,11 +590,26 @@ static int msm_eud_probe(struct platform_device *pdev) 
		chip->eud_mode_mgr2_phys_base = res->start;

	}



	chip->need_phy_clk_vote = of_property_read_bool(pdev->dev.of_node,

			      "qcom,eud-clock-vote-req");

	if (chip->need_phy_clk_vote) {

		chip->eud_ahb2phy_clk = devm_clk_get(&pdev->dev,

						     "eud_ahb2phy_clk");

		if (IS_ERR(chip->eud_ahb2phy_clk)) {

			ret = PTR_ERR(chip->eud_ahb2phy_clk);

			return ret;

		}



		ret = clk_prepare_enable(chip->eud_ahb2phy_clk);

		if (ret)

			return ret;

	}



	ret = devm_request_irq(&pdev->dev, chip->eud_irq, handle_eud_irq,

				IRQF_TRIGGER_HIGH, "eud_irq", chip);

	if (ret) {

		dev_err(chip->dev, "request failed for eud irq\n");

		return ret;

		goto error;

	}



	device_init_wakeup(&pdev->dev, true);
@@ -588,7 +631,7 @@ static int msm_eud_probe(struct platform_device *pdev) 
	ret = uart_add_one_port(&eud_uart_driver, port);

	if (!ret) {

		dev_err(chip->dev, "failed to add uart port!\n");

		return ret;

		goto error;

	}



	eud_private = pdev;
@@ -599,6 +642,12 @@ static int msm_eud_probe(struct platform_device *pdev) 
		enable_eud(pdev);



	return 0;



error:

	if (chip->need_phy_clk_vote && chip->eud_ahb2phy_clk)

		clk_disable_unprepare(chip->eud_ahb2phy_clk);



	return ret;

}



static int msm_eud_remove(struct platform_device *pdev)
@@ -608,6 +657,8 @@ static int msm_eud_remove(struct platform_device *pdev) 


	uart_remove_one_port(&eud_uart_driver, port);

	device_init_wakeup(chip->dev, false);

	if (chip->need_phy_clk_vote)

		clk_disable_unprepare(chip->eud_ahb2phy_clk);



	return 0;

}
@@ -618,12 +669,18 @@ static const struct of_device_id msm_eud_dt_match[] = { 
};

MODULE_DEVICE_TABLE(of, msm_eud_dt_match);



static const struct dev_pm_ops msm_eud_dev_pm_ops = {

	.suspend = msm_eud_suspend,

	.resume = msm_eud_resume,

};



static struct platform_driver msm_eud_driver = {

	.probe		= msm_eud_probe,

	.remove		= msm_eud_remove,

	.driver		= {

		.name		= "msm-eud",

		.owner		= THIS_MODULE,

		.pm = &msm_eud_dev_pm_ops,

		.of_match_table = msm_eud_dt_match,

	},

};