Messages in this thread Patch in this message | | | From | Frieder Schrempf <> | Subject | [PATCH 2/3] usb: misc: onboard_usb_hub: Add support for clock input | Date | Mon, 27 Nov 2023 12:13:23 +0100 |
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From: Frieder Schrempf <frieder.schrempf@kontron.de>
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> --- Changes in v2: * use %pe to print symbolic error name --- drivers/usb/misc/onboard_usb_hub.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)
diff --git a/drivers/usb/misc/onboard_usb_hub.c b/drivers/usb/misc/onboard_usb_hub.c index 077824beffa01..0d84b16deab50 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)) -- 2.42.1
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