netdev - Re: [PATCH net-next v2 08/10] net: pcs: xpcs: Add fwnode-based descriptor creation method

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Date: Wed, 5 Jun 2024 18:49:20 +0100
From: Simon Horman <horms@...nel.org>
To: Serge Semin <fancer.lancer@...il.com>
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Jose Abreu <joabreu@...opsys.com>,
	Jose Abreu <Jose.Abreu@...opsys.com>,
	Vladimir Oltean <olteanv@...il.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Maxime Chevallier <maxime.chevallier@...tlin.com>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Sagar Cheluvegowda <quic_scheluve@...cinc.com>,
	Abhishek Chauhan <quic_abchauha@...cinc.com>,
	Andrew Halaney <ahalaney@...hat.com>,
	Jiawen Wu <jiawenwu@...stnetic.com>,
	Mengyuan Lou <mengyuanlou@...-swift.com>,
	Tomer Maimon <tmaimon77@...il.com>, openbmc@...ts.ozlabs.org,
	netdev@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 08/10] net: pcs: xpcs: Add fwnode-based
 descriptor creation method

On Sun, Jun 02, 2024 at 05:36:22PM +0300, Serge Semin wrote:
> It's now possible to have the DW XPCS device defined as a standard
> platform device for instance in the platform DT-file. Although that
> functionality is useless unless there is a way to have the device found by
> the client drivers (STMMAC/DW *MAC, NXP SJA1105 Eth Switch, etc). Provide
> such ability by means of the xpcs_create_fwnode() method. It needs to be
> called with the device DW XPCS fwnode instance passed. That node will be
> then used to find the MDIO-device instance in order to create the DW XPCS
> descriptor.
> 
> Note the method semantics and name is similar to what has been recently
> introduced in the Lynx PCS driver.
> 
> Signed-off-by: Serge Semin <fancer.lancer@...il.com>

Hi Serge,

Some minor nits from my side flagged by kernel-doc -none -Wall

...

> diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c

...

> @@ -1505,6 +1507,16 @@ static struct dw_xpcs *xpcs_create(struct mdio_device *mdiodev,
>  	return ERR_PTR(ret);
>  }
>  
> +/**
> + * xpcs_create_mdiodev() - create a DW xPCS instance with the MDIO @addr
> + * @bus: pointer to the MDIO-bus descriptor for the device to be looked at
> + * @addr: device MDIO-bus ID
> + * @requested PHY interface

An entry for @interface should go here.

> + *
> + * If successful, returns a pointer to the DW XPCS handle. Otherwise returns
> + * -ENODEV if device couldn't be found on the bus, other negative errno related
> + * to the data allocation and MDIO-bus communications.

Please consider including this information as a Return: section of the
Kernel doc. Likewise for xpcs_create_fwnode().

> + */
>  struct dw_xpcs *xpcs_create_mdiodev(struct mii_bus *bus, int addr,
>  				    phy_interface_t interface)
>  {
> @@ -1529,6 +1541,44 @@ struct dw_xpcs *xpcs_create_mdiodev(struct mii_bus *bus, int addr,
>  }
>  EXPORT_SYMBOL_GPL(xpcs_create_mdiodev);
>  
> +/**
> + * xpcs_create_fwnode() - Create a DW xPCS instance from @fwnode
> + * @node: fwnode handle poining to the DW XPCS device

s/@...e/@...ode/

> + * @interface: requested PHY interface
> + *
> + * If successful, returns a pointer to the DW XPCS handle. Otherwise returns
> + * -ENODEV if the fwnode is marked unavailable or device couldn't be found on
> + * the bus, -EPROBE_DEFER if the respective MDIO-device instance couldn't be
> + * found, other negative errno related to the data allocations and MDIO-bus
> + * communications.
> + */
> +struct dw_xpcs *xpcs_create_fwnode(struct fwnode_handle *fwnode,
> +				   phy_interface_t interface)

...