From: Dinh Nguyen <dingu...@opensource.altera.com> Allow for platforms that have a reset controller driver in place to bring the USB IP out of reset.
Signed-off-by: Dinh Nguyen <dingu...@opensource.altera.com> Acked-by: John Youn <johny...@synopsys.com> Tested-by: Stefan Wahren <stefan.wah...@i2se.com> --- Hi Felipe, Can you please take this patch through your USB tree? This patch was dependent on "168d7c4e8bb2 reset: Return -ENOTSUPP when not configured" and is now in v3.8-rc1. The discussion is highlight here: https://lkml.org/lkml/2016/7/7/291 Thanks, Dinh --- v7: Use devm_reset_control_get_optional() v6: fix 80 line checkpatch warning in dev_err print v5: updated error conditions for not finding the reset property v4: use dev_dbg() if not a -EPROBE_DEFER v3: fix compile error v2: move to lowlevel_hw_init() --- drivers/usb/dwc2/core.h | 1 + drivers/usb/dwc2/platform.c | 22 ++++++++++++++++++++++ 2 files changed, 23 insertions(+) diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h index 9fae029..d645512 100644 --- a/drivers/usb/dwc2/core.h +++ b/drivers/usb/dwc2/core.h @@ -868,6 +868,7 @@ struct dwc2_hsotg { void *priv; int irq; struct clk *clk; + struct reset_control *reset; unsigned int queuing_high_bandwidth:1; unsigned int srp_success:1; diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c index fc6f525..530959a 100644 --- a/drivers/usb/dwc2/platform.c +++ b/drivers/usb/dwc2/platform.c @@ -45,6 +45,7 @@ #include <linux/platform_device.h> #include <linux/phy/phy.h> #include <linux/platform_data/s3c-hsotg.h> +#include <linux/reset.h> #include <linux/usb/of.h> @@ -337,6 +338,24 @@ static int dwc2_lowlevel_hw_init(struct dwc2_hsotg *hsotg) { int i, ret; + hsotg->reset = devm_reset_control_get_optional(hsotg->dev, "dwc2"); + if (IS_ERR(hsotg->reset)) { + ret = PTR_ERR(hsotg->reset); + switch (ret) { + case -ENOENT: + case -ENOTSUPP: + hsotg->reset = NULL; + break; + default: + dev_err(hsotg->dev, "error getting reset control %d\n", + ret); + return ret; + } + } + + if (hsotg->reset) + reset_control_deassert(hsotg->reset); + /* Set default UTMI width */ hsotg->phyif = GUSBCFG_PHYIF16; @@ -434,6 +453,9 @@ static int dwc2_driver_remove(struct platform_device *dev) if (hsotg->ll_hw_enabled) dwc2_lowlevel_hw_disable(hsotg); + if (hsotg->reset) + reset_control_assert(hsotg->reset); + return 0; } -- 2.8.3 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
