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Commit 3bb37c8e authored by Tony Lindgren's avatar Tony Lindgren
Browse files

bus: ti-sysc: Handle stdout-path for debug console 



If we have stdout-path specified for earlycon, we must prevent
the debug console from idling until runtime PM kicks in.

Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
parent 62020f23

drivers/bus/ti-sysc.c

+46 −0
Original line number Diff line number Diff line
@@ -206,6 +206,50 @@ static int sysc_parse_and_check_child_range(struct sysc *ddata) 
	return 0;

}



static struct device_node *stdout_path;



static void sysc_init_stdout_path(struct sysc *ddata)

{

	struct device_node *np = NULL;

	const char *uart;



	if (IS_ERR(stdout_path))

		return;



	if (stdout_path)

		return;



	np = of_find_node_by_path("/chosen");

	if (!np)

		goto err;



	uart = of_get_property(np, "stdout-path", NULL);

	if (!uart)

		goto err;



	np = of_find_node_by_path(uart);

	if (!np)

		goto err;



	stdout_path = np;



	return;



err:

	stdout_path = ERR_PTR(-ENODEV);

}



static void sysc_check_quirk_stdout(struct sysc *ddata,

				    struct device_node *np)

{

	sysc_init_stdout_path(ddata);

	if (np != stdout_path)

		return;



	ddata->cfg.quirks |= SYSC_QUIRK_NO_IDLE_ON_INIT |

				SYSC_QUIRK_NO_RESET_ON_INIT;

}



/**

 * sysc_check_one_child - check child configuration

 * @ddata: device driver data
@@ -224,6 +268,8 @@ static int sysc_check_one_child(struct sysc *ddata, 
	if (name)

		dev_warn(ddata->dev, "really a child ti,hwmods property?");



	sysc_check_quirk_stdout(ddata, np);



	return 0;

}