linux-kernel - Re: [PATCH V2 4/8] usb: dwc3: drd: Register the eud connector child node for dwc3

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Date:   Wed, 15 Dec 2021 17:36:00 +0530
From:   Souradeep Chowdhury <quic_schowdhu@...cinc.com>
To:     Rob Herring <robh@...nel.org>
CC:     <linux-arm-msm@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <pure.logic@...us-software.ie>,
        <bjorn.andersson@...aro.org>, <greg@...ah.com>,
        <linux-kernel@...r.kernel.org>, <quic_tsoni@...cinc.com>,
        <quic_psodagud@...cinc.com>, <quic_satyap@...cinc.com>,
        <quic_pheragu@...cinc.com>, <quic_rjendra@...cinc.com>,
        <quic_sibis@...cinc.com>, <quic_saipraka@...cinc.com>
Subject: Re: [PATCH V2 4/8] usb: dwc3: drd: Register the eud connector child
 node for dwc3


On 12/14/2021 1:33 AM, Rob Herring wrote:
> On Thu, Dec 02, 2021 at 03:21:23PM +0530, Souradeep Chowdhury wrote:
>> Register the child node for dwc3 which is the "eud_usb_connector".
>> The eud driver will be able to switch the usb role from device to
>> host and vice versa using the role switch property of dwc3 node.
>>
>> Signed-off-by: Souradeep Chowdhury <quic_schowdhu@...cinc.com>
>> ---
>>   drivers/usb/dwc3/drd.c | 26 ++++++++++++++++++++++++++
>>   1 file changed, 26 insertions(+)
>>
>> diff --git a/drivers/usb/dwc3/drd.c b/drivers/usb/dwc3/drd.c
>> index d7f7683..b4ea55c 100644
>> --- a/drivers/usb/dwc3/drd.c
>> +++ b/drivers/usb/dwc3/drd.c
>> @@ -8,6 +8,7 @@
>>    */
>>   
>>   #include <linux/extcon.h>
>> +#include <linux/of_platform.h>
>>   #include <linux/of_graph.h>
>>   #include <linux/platform_device.h>
>>   #include <linux/property.h>
>> @@ -164,6 +165,27 @@ static int dwc3_otg_get_irq(struct dwc3 *dwc)
>>   	return irq;
>>   }
>>   
>> +static int dwc3_register_eud(struct dwc3 *dwc)
>> +{
>> +	struct device		*dev = dwc->dev;
>> +	struct device_node	*np = dev->of_node;
>> +	int                     ret;
>> +
>> +	of_get_child_by_name(np, "eud_usb_connector");
> Connector nodes are named 'connector' or possibly 'usb-connector'. If
> you are creating an ABI with the node name, it should be documented.
> However, it's preferred to use 'compatible' for identifying nodes rather
> than a node name.
Ack.
>> +	if (!np) {
>> +		dev_dbg(dev, "no usb_connector child node specified\n");
>> +		return 0;
>> +	}
>> +
>> +	ret = of_platform_populate(np, NULL, NULL, dev);
> But why is any of this needed. The connector doesn't have a driver (I
> expect eventually we will) and the EUD device is not a child.

Ack. This can be removed as we are no longer mapping EUD as a type C 
connector.


>> +	if (ret) {
>> +		dev_err(dev, "failed to register usb_connector - %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>>   void dwc3_otg_init(struct dwc3 *dwc)
>>   {
>>   	u32 reg;
>> @@ -580,6 +602,10 @@ int dwc3_drd_init(struct dwc3 *dwc)
>>   		ret = dwc3_setup_role_switch(dwc);
>>   		if (ret < 0)
>>   			return ret;
>> +
>> +		ret = dwc3_register_eud(dwc);
>> +		if (ret < 0)
>> +			return ret;
>>   	} else if (dwc->edev) {
>>   		dwc->edev_nb.notifier_call = dwc3_drd_notifier;
>>   		ret = extcon_register_notifier(dwc->edev, EXTCON_USB_HOST,
>> -- 
>> 2.7.4
>>
>>