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

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Date: Thu, 23 May 2024 08:51:39 +0000
From: <Parthiban.Veerasooran@...rochip.com>
To: <Woojung.Huh@...rochip.com>
CC: <netdev@...r.kernel.org>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <steve.glendinning@...well.net>,
	<UNGLinuxDriver@...rochip.com>, <davem@...emloft.net>, <edumazet@...gle.com>,
	<kuba@...nel.org>, <pabeni@...hat.com>
Subject: Re: [PATCH] net: usb: smsc95xx: configure external LEDs function for
 EVB-LAN8670-USB

Hi Woojung,

On 23/05/24 1:22 am, Woojung Huh - C21699 wrote:
> Hi Parthiban,
> 
> LED_SEL is configurable option by EEPROM which should be populated on
> EVB-LAN8670-USB. I would suggest changing EEPROM configuration than
> hard-coded in driver code.
Ah OK. Thanks for letting me know. I tried that EEPROM approach but that 
is needed a fix to work properly. I will send out another fix patch 
separately. Please review it.

Please discard this patch as it is going to be invalid.

Thanks for your understanding.

Best regards,
Parthiban V
> 
> Thanks.
> Woojung
> 
>> -----Original Message-----
>> From: Parthiban Veerasooran <Parthiban.Veerasooran@...rochip.com>
>> Sent: Wednesday, May 22, 2024 10:08 AM
>> To: steve.glendinning@...well.net; UNGLinuxDriver
>> <UNGLinuxDriver@...rochip.com>; davem@...emloft.net; edumazet@...gle.com;
>> kuba@...nel.org; pabeni@...hat.com
>> Cc: netdev@...r.kernel.org; linux-usb@...r.kernel.org; linux-
>> kernel@...r.kernel.org; Parthiban Veerasooran - I17164
>> <Parthiban.Veerasooran@...rochip.com>
>> Subject: [PATCH] net: usb: smsc95xx: configure external LEDs function for
>> EVB-LAN8670-USB
>>
>> 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
>>
>> Signed-off-by: Parthiban Veerasooran <Parthiban.Veerasooran@...rochip.com>
>> ---
>>   drivers/net/usb/smsc95xx.c | 12 ++++++++++++
>>   drivers/net/usb/smsc95xx.h |  1 +
>>   2 files changed, 13 insertions(+)
>>
>> diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
>> index cbea24666479..05975461bf10 100644
>> --- a/drivers/net/usb/smsc95xx.c
>> +++ b/drivers/net/usb/smsc95xx.c
>> @@ -1006,6 +1006,18 @@ static int smsc95xx_reset(struct usbnet *dev)
>>   	/* Configure GPIO pins as LED outputs */
>>   	write_buf = LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED |
>>   		LED_GPIO_CFG_FDX_LED;
>> +
>> +	/* Set LED Select (LED_SEL) bit for the external LED pins
>> functionality
>> +	 * in the Microchip's EVB-LAN8670-USB 10BASE-T1S Ethernet device which
>> +	 * uses the below LED function.
>> +	 * nSPD_LED -> Speed Indicator
>> +	 * nLNKA_LED -> Link Indicator
>> +	 * nFDX_LED -> Activity Indicator
>> +	 */
>> +	if (dev->udev->descriptor.idVendor == 0x184F &&
>> +	    dev->udev->descriptor.idProduct == 0x0051)
>> +		write_buf |= LED_GPIO_CFG_LED_SEL;
>> +
>>   	ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, write_buf);
>>   	if (ret < 0)
>>   		return ret;
>> diff --git a/drivers/net/usb/smsc95xx.h b/drivers/net/usb/smsc95xx.h
>> index 013bf42e27f2..134f3c2fddd9 100644
>> --- a/drivers/net/usb/smsc95xx.h
>> +++ b/drivers/net/usb/smsc95xx.h
>> @@ -114,6 +114,7 @@
>>
>>   /* LED General Purpose IO Configuration Register */
>>   #define LED_GPIO_CFG		(0x24)
>> +#define LED_GPIO_CFG_LED_SEL	BIT(31)		/* Separate Link/Act LEDs */
>>   #define LED_GPIO_CFG_SPD_LED	(0x01000000)	/* GPIOz as Speed LED */
>>   #define LED_GPIO_CFG_LNK_LED	(0x00100000)	/* GPIOy as Link LED */
>>   #define LED_GPIO_CFG_FDX_LED	(0x00010000)	/* GPIOx as Full Duplex LED
>> */
>>
>> base-commit: 4b377b4868ef17b040065bd468668c707d2477a5
>> --
>> 2.34.1
>