linux-kernel - Re: [PATCH v3 2/5] net: hpe: Add GXP UMAC MDIO

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Message-ID: <16d8e283-79f7-44bb-af5f-b84cdf7c9d79@lunn.ch>
Date:   Thu, 17 Aug 2023 03:19:33 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     nick.hawkins@....com
Cc:     christophe.jaillet@...adoo.fr, simon.horman@...igine.com,
        verdun@....com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/5] net: hpe: Add GXP UMAC MDIO

On Wed, Aug 16, 2023 at 04:52:17PM -0500, nick.hawkins@....com wrote:
> From: Nick Hawkins <nick.hawkins@....com>
> 
> The GXP contains two Universal Ethernet MACs that can be
> connected externally to several physical devices. From an external
> interface perspective the BMC provides two SERDES interface connections
> capable of either SGMII or 1000Base-X operation. The BMC also provides
> a RMII interface for sideband connections to external Ethernet controllers.
> 
> The primary MAC (umac0) can be mapped to either SGMII/1000-BaseX
> SERDES interface.  The secondary MAC (umac1) can be mapped to only
> the second SGMII/1000-Base X Serdes interface or it can be mapped for
> RMII sideband.
> 
> The MDIO(mdio0) interface from the primary MAC (umac0) is used for
> external PHY status and configuration. The MDIO(mdio1) interface from
> the secondary MAC (umac1) is routed to the SGMII/100Base-X IP blocks

I think that is a typo. 100BaseX does not exist, the nearest is 100BaseFX.

> +config GXP_UMAC_MDIO
> +	tristate "GXP UMAC mdio support"
> +	depends on ARCH_HPE || COMPILE_TEST
> +	depends on OF_MDIO && HAS_IOMEM
> +	depends on MDIO_DEVRES
> +	help
> +	  Say y here to support the GXP UMAC MDIO bus. The
> +	  MDIO (mdio0) interface from the primary MAC (umac0)
> +	  is used for external PHY status and configuration.
> +	  The MDIO (mdio1) interface from the secondary MAC
> +	  (umac1) is routed to the SGMII/100Base-X IP blocks

Same here.

> --- a/drivers/net/mdio/Makefile
> +++ b/drivers/net/mdio/Makefile
> @@ -11,6 +11,7 @@ obj-$(CONFIG_MDIO_BCM_UNIMAC)		+= mdio-bcm-unimac.o
>  obj-$(CONFIG_MDIO_BITBANG)		+= mdio-bitbang.o
>  obj-$(CONFIG_MDIO_CAVIUM)		+= mdio-cavium.o
>  obj-$(CONFIG_MDIO_GPIO)			+= mdio-gpio.o
> +obj-$(CONFIG_GXP_UMAC_MDIO)		+= mdio-gxp-umac.o
>  obj-$(CONFIG_MDIO_HISI_FEMAC)		+= mdio-hisi-femac.o

Don't you think this looks out of place. The only one not CONFIG_MDIO ?

> +static int umac_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 value)
> +{
> +	struct umac_mdio_priv *umac_mdio = bus->priv;
> +	unsigned int status;
> +	int ret;
> +
> +	writel(value, umac_mdio->base + UMAC_MII_DATA);

...

> +	if (ret)
> +		dev_err(bus->parent, "mdio read time out\n");

cut/paste error.


    Andrew

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