linux-kernel - Re: [PATCH v5 2/2] usb: typec: hd3ss3220: Enable VBUS based on ID pin state

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Message-ID: <243611cf-5083-40d0-a52a-02ab068aa942@oss.qualcomm.com>
Date: Fri, 31 Oct 2025 12:15:44 +0530
From: Krishna Kurapati PSSNV <krishna.kurapati@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Biju Das <biju.das.jz@...renesas.com>, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/2] usb: typec: hd3ss3220: Enable VBUS based on ID pin
 state



On 10/27/2025 6:49 PM, Dmitry Baryshkov wrote:
> On Mon, Oct 27, 2025 at 11:47:13AM +0200, Heikki Krogerus wrote:
>> Hi Krishna,
>>
>>> +static int hd3ss3220_get_vbus_supply(struct hd3ss3220 *hd3ss3220)
>>> +{
>>> +	struct device_node *hd3ss3220_node = hd3ss3220->dev->of_node;
>>> +	struct device_node *np;
>>> +
>>> +	np = of_graph_get_remote_node(hd3ss3220_node, 0, 0);
>>> +	if (!np) {
>>> +		dev_err(hd3ss3220->dev, "failed to get device node");
>>> +		return -ENODEV;
>>> +	}
>>
>> So I guess that's the connector node. Why can't you just place the
>> regulator reference to the hd3ss3220 controller node instead of the
>> connector like the port controllers do?
>>
>> That would allow us to do a simple devm_regulator_get_optional() call
>> that's not tied to DT only.
> 
> But we have devm_of_regulator_get_optional(), it was mentioned in the
> previous email if I'm not mistaken. If we need, we should add
> devm_fwnode_regulator_get(_optional).
> 
> vbus supply is described as a part of the usb-c-connector schema, so
> it is not that logical to describe it as a part of the Type-C
> controller.
> 
> 

I tried the following as suggested:

hd3ss3220->vbus =  devm_of_regulator_get_optional(hd3ss3220->dev, 
to_of_node(connector),
if (IS_ERR(hd3ss3220->vbus))
   hd3ss3220->vbus = NULL;

If there is a vbus supply I see its returning proper handle pointer.
Else it returned ENODEV. (which is fine for our case as there is no vbus 
in DT).

Can I mark the function as a void one. Instead of returning any int 
value, would it be fine if to just mark vbus as NULL and proceed ?

Regards,
Krishna,