linux-kernel - Re: [PATCH] net: usb: smsc95xx: configure external LEDs function for EVB-LAN8670-USB

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Date: Thu, 23 May 2024 08:51:54 +0000
From: <Parthiban.Veerasooran@...rochip.com>
To: <andrew@...n.ch>
CC: <steve.glendinning@...well.net>, <UNGLinuxDriver@...rochip.com>,
	<davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <netdev@...r.kernel.org>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: usb: smsc95xx: configure external LEDs function for
 EVB-LAN8670-USB

Hi Andrew,

On 22/05/24 10:14 pm, Andrew Lunn wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> On Wed, May 22, 2024 at 07:38:17PM +0530, Parthiban Veerasooran wrote:
>> By default, LAN9500A configures the external LEDs to the below function.
>> nSPD_LED -> Speed Indicator
>> nLNKA_LED -> Link and Activity Indicator
>> nFDX_LED -> Full Duplex Link Indicator
>>
>> But, EVB-LAN8670-USB uses the below external LEDs function which can be
>> enabled by writing 1 to the LED Select (LED_SEL) bit in the LAN9500A.
>> nSPD_LED -> Speed Indicator
>> nLNKA_LED -> Link Indicator
>> nFDX_LED -> Activity Indicator
> 
> What else can the LEDs indicate?
There is no other indications.
> 
>> +     /* Set LED Select (LED_SEL) bit for the external LED pins functionality
>> +      * in the Microchip's EVB-LAN8670-USB 10BASE-T1S Ethernet device which
> 
> Is this a function of the USB dongle? Or a function of the PHY?
It is the function of USB dongle.

Sorry Andrew, I am not going to proceed further with this patch as 
Woojung pointed out EEPROM approach can be used instead of updating the 
driver. I tried that as well. So please discard this patch. But the 
EEPROM approach mentioned by Woojung is needed a fix in the driver to 
work properly. I will send out that fix patch separately. Please review it.

Thanks for your understanding.

Best regards,
Parthiban V
> 
>          Andrew