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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: Frieder Schrempf <frieder.schrempf@kontron.de>
Link: https://lore.kernel.org/r/20231127112234.109073-2-frieder@fris.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Frieder Schrempf 2023-11-27 12:22:25 +01:00 committed by Greg Kroah-Hartman
parent ea3ba10f29
commit 65e62b8a95
1 changed files with 14 additions and 0 deletions
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14
drivers/usb/misc/onboard_usb_hub.c
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@ -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))