[U-Boot] [PATCH] usb: dwc2: Add reset ctrl to driver

[Marek Vasut <marex@denx.de>]

On 08/15/2018 08:01 PM, Ley Foon Tan wrote:
> Add code to reset all reset signals as in usb DT node. A reset property
> is an optional feature, so only print out a warning and do not fail if a
> reset property is not present.
> 
> If a reset property is discovered, then use it to deassert, thus
> bringing the IP out of reset.
> 
> Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
> ---
>  drivers/usb/host/dwc2.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/drivers/usb/host/dwc2.c b/drivers/usb/host/dwc2.c
> index cbe065b..b77e0c6 100644
> --- a/drivers/usb/host/dwc2.c
> +++ b/drivers/usb/host/dwc2.c
> @@ -15,6 +15,7 @@
>  #include <wait_bit.h>
>  #include <asm/io.h>
>  #include <power/regulator.h>
> +#include <reset.h>
>  
>  #include "dwc2.h"
>  
> @@ -1124,12 +1125,28 @@ int _submit_int_msg(struct dwc2_priv *priv, struct usb_device *dev,
>  	}
>  }
>  
> +static void dwc2_reset(struct udevice *dev)
> +{
> +	struct reset_ctl_bulk reset_bulk;
> +	int ret;
> +
> +	ret = reset_get_bulk(dev, &reset_bulk);
> +	if (ret) {
> +		dev_warn(dev, "Can't get reset: %d\n", ret);
> +		return;
> +	}
> +
> +	reset_deassert_bulk(&reset_bulk);
> +}
> +
>  static int dwc2_init_common(struct udevice *dev, struct dwc2_priv *priv)
>  {
>  	struct dwc2_core_regs *regs = priv->regs;
>  	uint32_t snpsid;
>  	int i, j;
>  
> +	dwc2_reset(dev);
> +
>  	snpsid = readl(&regs->gsnpsid);
>  	dev_info(dev, "Core Release: %x.%03x\n",
>  		 snpsid >> 12 & 0xf, snpsid & 0xfff);
> 

.remove() should assert the reset again.

-- 
Best regards,
Marek Vasut