diff options
| author | Frieder Schrempf <frieder.schrempf@kontron.de> | 2023-11-27 14:22:25 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-11-27 22:13:22 +0300 |
| commit | 65e62b8a955adebee8634804d8f72599213c2774 (patch) | |
| tree | 57d83784b740585684b37c1296e720d57466d177 | |
| parent | ea3ba10f2961f08155bb66c0b1b8088652ca5f28 (diff) | |
| download | linux-65e62b8a955adebee8634804d8f72599213c2774.tar.xz | |
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>
| -rw-r--r-- | drivers/usb/misc/onboard_usb_hub.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/usb/misc/onboard_usb_hub.c b/drivers/usb/misc/onboard_usb_hub.c index 6d122772a970..3b209104f648 100644 --- a/drivers/usb/misc/onboard_usb_hub.c +++ b/drivers/usb/misc/onboard_usb_hub.c @@ -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)) |