Commit 65e62b8a authored by Frieder Schrempf's avatar Frieder Schrempf Committed by Greg Kroah-Hartman
Browse files

usb: misc: onboard_usb_hub: Add support for clock input 



Most onboard USB hubs have a dedicated crystal oscillator but on some
boards the clock signal for the hub is provided by the SoC.

In order to support this, we add the possibility of specifying a
clock in the devicetree that gets enabled/disabled when the hub
is powered up/down.

Signed-off-by: default avatarFrieder Schrempf <frieder.schrempf@kontron.de>
Link: https://lore.kernel.org/r/20231127112234.109073-2-frieder@fris.de


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ea3ba10f

drivers/usb/misc/onboard_usb_hub.c

+14 −0
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ 
 * Copyright (c) 2022, Google LLC

 */



#include <linux/clk.h>

#include <linux/device.h>

#include <linux/export.h>

#include <linux/err.h>
@@ -61,12 +62,19 @@ struct onboard_hub { 
	bool going_away;

	struct list_head udev_list;

	struct mutex lock;

	struct clk *clk;

};



static int onboard_hub_power_on(struct onboard_hub *hub)

{

	int err;



	err = clk_prepare_enable(hub->clk);

	if (err) {

		dev_err(hub->dev, "failed to enable clock: %pe\n", ERR_PTR(err));

		return err;

	}



	err = regulator_bulk_enable(hub->pdata->num_supplies, hub->supplies);

	if (err) {

		dev_err(hub->dev, "failed to enable supplies: %pe\n", ERR_PTR(err));
@@ -93,6 +101,8 @@ static int onboard_hub_power_off(struct onboard_hub *hub) 
		return err;

	}



	clk_disable_unprepare(hub->clk);



	hub->is_powered_on = false;



	return 0;
@@ -267,6 +277,10 @@ static int onboard_hub_probe(struct platform_device *pdev) 
		return err;

	}



	hub->clk = devm_clk_get_optional(dev, NULL);

	if (IS_ERR(hub->clk))

		return dev_err_probe(dev, PTR_ERR(hub->clk), "failed to get clock\n");



	hub->reset_gpio = devm_gpiod_get_optional(dev, "reset",

						  GPIOD_OUT_HIGH);

	if (IS_ERR(hub->reset_gpio))