Commit 758ca99d authored by Vaibhav Hiremath's avatar Vaibhav Hiremath Committed by Greg Kroah-Hartman
Browse files

greybus: arche-platform: Introduce coldboot_seq fn 



This is preparation for support for different operational states
(defined by arche_platform_state) in the driver, to enable
user/developer to dynamically configure the state.

arche_platform_coldboot_seq() fn will be responsible for
rebooting SVC device.

Testing Done: Tested on EVT1.2 and DB3.5 platform

Signed-off-by: default avatarVaibhav Hiremath <vaibhav.hiremath@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@google.com>
parent a821adb4

drivers/staging/greybus/arche-platform.c

+34 −15
Original line number Diff line number Diff line
@@ -104,6 +104,32 @@ static void unexport_gpios(struct arche_platform_drvdata *arche_pdata) 
	gpio_unexport(arche_pdata->svc_sysboot_gpio);

}



static int arche_platform_coldboot_seq(struct arche_platform_drvdata *arche_pdata)

{

	int ret;



	dev_info(arche_pdata->dev, "Booting from cold boot state\n");



	svc_reset_onoff(arche_pdata->svc_reset_gpio,

			arche_pdata->is_reset_act_hi);



	gpio_set_value(arche_pdata->svc_sysboot_gpio, 0);

	usleep_range(100, 200);



	ret = clk_prepare_enable(arche_pdata->svc_ref_clk);

	if (ret) {

		dev_err(arche_pdata->dev, "failed to enable svc_ref_clk: %d\n",

				ret);

		return ret;

	}



	/* bring SVC out of reset */

	svc_reset_onoff(arche_pdata->svc_reset_gpio,

			!arche_pdata->is_reset_act_hi);



	return 0;

}



static void arche_platform_cleanup(struct arche_platform_drvdata *arche_pdata)

{

	clk_disable_unprepare(arche_pdata->svc_ref_clk);
@@ -185,11 +211,6 @@ static int arche_platform_probe(struct platform_device *pdev) 
		dev_err(dev, "failed to get svc_ref_clk: %d\n", ret);

		return ret;

	}

	ret = clk_prepare_enable(arche_pdata->svc_ref_clk);

	if (ret) {

		dev_err(dev, "failed to enable svc_ref_clk: %d\n", ret);

		return ret;

	}



	platform_set_drvdata(pdev, arche_pdata);
@@ -200,34 +221,32 @@ static int arche_platform_probe(struct platform_device *pdev) 
	if (arche_pdata->wake_detect_gpio < 0) {

		dev_err(dev, "failed to get wake detect gpio\n");

		ret = arche_pdata->wake_detect_gpio;

		goto exit;

		return ret;

	}



	ret = devm_gpio_request(dev, arche_pdata->wake_detect_gpio, "wake detect");

	if (ret) {

		dev_err(dev, "Failed requesting wake_detect gpio %d\n",

				arche_pdata->wake_detect_gpio);

		goto exit;

		return ret;

	}

	/* deassert wake detect */

	gpio_direction_output(arche_pdata->wake_detect_gpio, 0);



	/* bring SVC out of reset */

	svc_reset_onoff(arche_pdata->svc_reset_gpio,

			!arche_pdata->is_reset_act_hi);



	arche_pdata->dev = &pdev->dev;

	INIT_DELAYED_WORK(&arche_pdata->delayed_work, svc_delayed_work);

	schedule_delayed_work(&arche_pdata->delayed_work, msecs_to_jiffies(2000));



	ret = arche_platform_coldboot_seq(arche_pdata);

	if (ret) {

		dev_err(dev, "Failed to cold boot svc %d\n", ret);

		return ret;

	}



	export_gpios(arche_pdata);



	dev_info(dev, "Device registered successfully\n");

	return 0;



exit:

	arche_platform_cleanup(arche_pdata);

	return ret;

}



static int arche_remove_child(struct device *dev, void *unused)