netdev - Re: [PATCH v3 2/8] net: phy: Add 10-BaseT1L registers

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Message-ID: <20211012063714.GA938@pengutronix.de>
Date:   Tue, 12 Oct 2021 08:37:14 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     alexandru.tachici@...log.com
Cc:     andrew@...n.ch, davem@...emloft.net, devicetree@...r.kernel.org,
        hkallweit1@...il.com, kuba@...nel.org,
        linux-kernel@...r.kernel.org, linux@...linux.org.uk,
        netdev@...r.kernel.org, robh+dt@...nel.org
Subject: Re: [PATCH v3 2/8] net: phy: Add 10-BaseT1L registers

On Mon, Oct 11, 2021 at 05:22:09PM +0300, alexandru.tachici@...log.com wrote:
> From: Alexandru Tachici <alexandru.tachici@...log.com>
> 
> The 802.3gc specification defines the 10-BaseT1L link
> mode for ethernet trafic on twisted wire pair.
> 
> PMA status register can be used to detect if the phy supports
> 2.4 V TX level and PCS control register can be used to
> enable/disable PCS level loopback.
> 
> Signed-off-by: Alexandru Tachici <alexandru.tachici@...log.com>

Reviewed-by: Oleksij Rempel <o.rempel@...gutronix.de>
Thank you!

Question on maintainers: IEEE 802.3 spec, documents register bits in the
little-endian order. In the mdio.h we use big-endian, it makes
comparison with the spec a bit more challenging. May be we should fix
it?

Regards,
Oleksij

> ---
>  include/uapi/linux/mdio.h | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/include/uapi/linux/mdio.h b/include/uapi/linux/mdio.h
> index bdf77dffa5a4..8ae82fe3aece 100644
> --- a/include/uapi/linux/mdio.h
> +++ b/include/uapi/linux/mdio.h
> @@ -65,6 +65,8 @@
>  #define MDIO_PCS_10GBRT_STAT2	33	/* 10GBASE-R/-T PCS status 2 */
>  #define MDIO_AN_10GBT_CTRL	32	/* 10GBASE-T auto-negotiation control */
>  #define MDIO_AN_10GBT_STAT	33	/* 10GBASE-T auto-negotiation status */
> +#define MDIO_PMA_10T1L_STAT	2295	/* 10BASE-T1L PMA status */
> +#define MDIO_PCS_10T1L_CTRL	2278	/* 10BASE-T1L PCS control */
>  
>  /* LASI (Link Alarm Status Interrupt) registers, defined by XENPAK MSA. */
>  #define MDIO_PMA_LASI_RXCTRL	0x9000	/* RX_ALARM control */
> @@ -262,6 +264,20 @@
>  #define MDIO_AN_10GBT_STAT_MS		0x4000	/* Master/slave config */
>  #define MDIO_AN_10GBT_STAT_MSFLT	0x8000	/* Master/slave config fault */
>  
> +/* 10BASE-T1L PMA status register. */
> +#define MDIO_PMA_10T1L_STAT_LINK	0x0001	/* PMA receive link up */
> +#define MDIO_PMA_10T1L_STAT_FAULT	0x0002	/* Fault condition detected */
> +#define MDIO_PMA_10T1L_STAT_POLARITY	0x0004	/* Receive polarity is reversed */
> +#define MDIO_PMA_10T1L_STAT_RECV_FAULT	0x0200	/* Able to detect fault on receive path */
> +#define MDIO_PMA_10T1L_STAT_EEE		0x0400	/* PHY has EEE ability */
> +#define MDIO_PMA_10T1L_STAT_LOW_POWER	0x0800	/* PMA has low-power ability */
> +#define MDIO_PMA_10T1L_STAT_2V4_ABLE	0x1000	/* PHY has 2.4 Vpp operating mode ability */
> +#define MDIO_PMA_10T1L_STAT_LB_ABLE	0x2000	/* PHY has loopback ability */
> +
> +/* 10BASE-T1L PCS control register. */
> +#define MDIO_PCS_10T1L_CTRL_LB		0x4000	/* Enable PCS level loopback mode */
> +#define MDIO_PCS_10T1L_CTRL_RESET	0x8000	/* PCS reset */
> +
>  /* EEE Supported/Advertisement/LP Advertisement registers.
>   *
>   * EEE capability Register (3.20), Advertisement (7.60) and
> -- 
> 2.25.1 



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