Re: [PATCH v4 2/3] phy: qcom: qmp-combo: get the USB3 & DisplayPort lanes mapping from DT

[Neil Armstrong]

On 10/6/25 12:08, Konrad Dybcio wrote:
> On 9/30/25 9:39 AM, Neil Armstrong wrote:
> > The QMP USB3/DP Combo PHY hosts an USB3 phy and a DP PHY on top
> > of a combo glue to route either lanes to the 4 shared physical lanes.
> >
> > The routing of the lanes can be:
> > - 2 DP + 2 USB3
> > - 4 DP
> > - 2 USB3
> >
> > Get the lanes mapping from DT and stop registering the USB-C
> > muxes in favor of a static mode and orientation detemined
> > by the lanes mapping.
> >
> > This allows supporting boards with direct connection of USB3 and
> > DisplayPort lanes to the QMP Combo PHY lanes, not using the
> > USB-C Altmode feature.
> >
> > Signed-off-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
> > ---
>
> [...]
>
> > +struct qmp_combo_lane_mapping {
> > +	unsigned int lanes_count;
>
> "num_lanes"?

Is this significant ?

> > +	enum typec_orientation orientation;
> > +	u32 lanes[4];
> > +};
> > +
> > +static const struct qmp_combo_lane_mapping usb3_data_lanes[] = {
> > +	{ 2, TYPEC_ORIENTATION_NORMAL, { 1, 0 }},
> > +	{ 2, TYPEC_ORIENTATION_REVERSE, { 2, 3 }},
> > +};
> > +
> > +static const struct qmp_combo_lane_mapping dp_data_lanes[] = {
> > +	{ 1, TYPEC_ORIENTATION_NORMAL, { 0 }},
> > +	{ 1, TYPEC_ORIENTATION_REVERSE, { 3 }},
>
> This is not corroborated by your bindings change ^

Damn you're right, I'll fix it...

> I'm also frankly not sure whether it's pin 2 or 3 that 1-lane-DP
> would be TXd on
>
> > +	{ 2, TYPEC_ORIENTATION_NORMAL, { 3, 2 }},
> > +	{ 2, TYPEC_ORIENTATION_REVERSE, { 0, 1 }},
> > +	{ 4, TYPEC_ORIENTATION_NORMAL, { 3, 2, 1, 0 }},
> > +	{ 4, TYPEC_ORIENTATION_REVERSE, { 0, 1, 2, 3 }},
>
> Would it be too cheesy to check orientation based like:
>
> static bool qmpphy_mapping_orient_flipped(u32 *data_lanes)
> {
> 	return data_lanes[0] == 0;
> }
>
> ?

Do we want a proper check of the property content or some random check ?
Sorry I prefer something formal, since perhaps sometime we will have
a full lanes remapping available instead of just orientation and if
we have some random input it will explose...

> > -	ret = qmp_combo_typec_register(qmp);
> > -	if (ret)
> > -		goto err_node_put;
> > +	qmp->qmpphy_mode = QMPPHY_MODE_USB3DP;
> > +
> > +	if (of_find_property(dev->of_node, "mode-switch", NULL) ||
> > +	    of_find_property(dev->of_node, "orientation-switch", NULL)) {
>
> of_property_present()

I'll replace with that.

Thanks,
Neil

> Konrad