linux-kernel - Re: [PATCH 3/3] arm64: dts: ti: k3-j722s-evm: Update USB0 and USB1 configuration for EVM

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Date: Wed, 8 May 2024 18:18:06 +0530
From: Ravi Gunasekaran <r-gunasekaran@...com>
To: Roger Quadros <rogerq@...nel.org>, <nm@...com>, <vigneshr@...com>
CC: <kristo@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
        <conor+dt@...nel.org>, <srk@...com>,
        <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Ravi
 Gunasekaran <r-gunasekaran@...com>
Subject: Re: [PATCH 3/3] arm64: dts: ti: k3-j722s-evm: Update USB0 and USB1
 configuration for EVM



On 5/8/24 5:33 PM, Roger Quadros wrote:
> 
> 
> On 29/04/2024 15:09, Ravi Gunasekaran wrote:
>> The GPIO expander on the EVM allows the USB selection for Type-C
>> port to either USB0 or USB1 via USB hub. By default, let the Type-C
>> port select USB0 via the GPIO expander port P05.
>>
>> Enable super-speed on USB1 by updating SerDes0 lane configuration.
>>
>> Signed-off-by: Ravi Gunasekaran <r-gunasekaran@...com>
>> ---
>>  arch/arm64/boot/dts/ti/k3-j722s-evm.dts | 58 +++++++++++++++++++++++++
>>  arch/arm64/boot/dts/ti/k3-serdes.h      |  7 +++
>>  2 files changed, 65 insertions(+)
>>

[...]

>> +
>> +		p05-hog {
>> +			/* P05 - USB2.0_MUX_SEL */
>> +			gpio-hog;
>> +			gpios = <5 GPIO_ACTIVE_LOW>;
>> +			output-high;
>> +			line-name = "USB2.0_MUX_SEL";
> 
> This line-name is already added in gpio-line-names property above.
> Do we really need to add it again?

Not needed. If the line-name property is not present for the hog,
then its taken from the gpio chip via gpio-line-names.
So I will remove the line-name property in v2

static struct gpio_desc *of_parse_own_gpio(...)
..
        if (name && of_property_read_string(np, "line-name", name))                                     
                *name = np->name; 
..

> 
>> +		};
>>  	};
>>  };
>>  

[...]


-- 
Regards,
Ravi