Re: [PATCH] usb: imx-us-phy: add vbus_valid ro parameter

[Marco Felsch <m.felsch@pengutronix.de>]

Hi Ahmad,

On 21-08-24 13:01, Ahmad Fatoum wrote:
> Hello Marco,
> 
> On 24.08.21 12:46, Marco Felsch wrote:
> > The parameter can be used by init scripts to detect a plugged usb cable.
> > Upon a plugged usb cable the barebox behaviour can be changed which can
> > be useful e.g. during production to apply a special production
> > environment.
> > 
> > Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
> > ---
> >  drivers/usb/imx/imx-usb-phy.c | 34 +++++++++++++++++++++++++++++++++-
> >  1 file changed, 33 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/usb/imx/imx-usb-phy.c b/drivers/usb/imx/imx-usb-phy.c
> > index 32098ef248..9420c8c109 100644
> > --- a/drivers/usb/imx/imx-usb-phy.c
> > +++ b/drivers/usb/imx/imx-usb-phy.c
> > @@ -37,9 +37,12 @@
> >  #define BM_USBPHY_CTRL_ENHOSTDISCONDETECT	BIT(1)
> >  
> >  #define ANADIG_USB1_CHRG_DETECT_SET		0x1b4
> > -#define ANADIG_USB2_CHRG_DETECT_SET		0x214
> >  #define ANADIG_USB1_CHRG_DETECT_EN_B		BIT(20)
> >  #define ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B	BIT(19)
> > +#define ANADIG_USB1_VBUS_DETECT_STAT		0x1c0
> > +#define ANADIG_USB1_VBUS_DETECT_STAT_VBUS_VALID	BIT(3)
> > +#define ANADIG_USB2_CHRG_DETECT_SET		0x214
> > +#define ANADIG_USB2_VBUS_DETECT_STAT		0x220
> >  
> >  struct imx_usbphy {
> >  	struct usb_phy usb_phy;
> > @@ -132,6 +135,27 @@ static const struct phy_ops imx_phy_ops = {
> >  	.to_usbphy = imx_usbphy_to_usbphy,
> >  };
> >  
> > +/* Albeit the access can only happen serial use two variables */
> > +unsigned int vbus_valid_usb1;
> > +unsigned int vbus_valid_usb2;
> > +
> > +static int imx_usbphy_get_vbus_state(struct param_d *p, void *priv)
> > +{
> > +	struct imx_usbphy *imxphy = priv;
> > +	unsigned int *vbus_valid;
> > +	unsigned int reg, val;
> > +
> > +	reg = imxphy->port_id ?
> > +		ANADIG_USB1_VBUS_DETECT_STAT :
> > +		ANADIG_USB2_VBUS_DETECT_STAT;
> > +	val = readl(imxphy->anatop + reg);
> > +
> > +	vbus_valid = imxphy->port_id ? &vbus_valid_usb1 : &vbus_valid_usb2;
> > +	*vbus_valid = !!(val & ANADIG_USB1_VBUS_DETECT_STAT_VBUS_VALID);
> > +
> > +	return 0;
> > +}
> > +
> >  static int imx_usbphy_probe(struct device_d *dev)
> >  {
> >  	struct resource *iores;
> > @@ -149,11 +173,19 @@ static int imx_usbphy_probe(struct device_d *dev)
> >  	imxphy->port_id = ret;
> >  
> >  	if (of_get_property(np, "fsl,anatop", NULL)) {
> > +		unsigned int *vbus_valid = imxphy->port_id ?
> > +			&vbus_valid_usb1 :
> > +			&vbus_valid_usb2;
> 
> Can you allocate this in imxphy? That way you avoid globals
> and don't hardcode the existance of only two phys into the driver.

You're right, good point.

> > +
> >  		imxphy->anatop =
> >  			syscon_base_lookup_by_phandle(np, "fsl,anatop");
> >  		ret = PTR_ERR_OR_ZERO(imxphy->anatop);
> >  		if (ret)
> >  			goto err_free;
> > +
> > +		dev_add_param_bool(dev, "vbus_valid", param_set_readonly,
> > +				   imx_usbphy_get_vbus_state, vbus_valid,
> > +				   imxphy);
> 
> I assume valid == usb port is in gadget mode and host is supplying vbus?

Your're right.

> What happens when port is in host mode? A comment explaining this would
> be nice.

That's a good question didn't checked this and the datasheet don't
distinguish between those modes. I will test it and add a comment.

Regards,
  Marco

> 
> >  	}
> >  
> >  	iores = dev_request_mem_resource(dev, 0);
> > 
> 
> 
> -- 
> Pengutronix e.K.                           |                             |
> Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
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> 

-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

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