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

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Date: Wed, 22 May 2024 19:52:50 +0000
From: <Woojung.Huh@...rochip.com>
To: <Parthiban.Veerasooran@...rochip.com>, <steve.glendinning@...well.net>,
	<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@...rochip.com>
Subject: RE: [PATCH] net: usb: smsc95xx: configure external LEDs function for
 EVB-LAN8670-USB

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.

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