netdev - Re: [net-next: PATCH v4 2/8] net: mdio: switch fixed-link PHYs API to fwnode

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Message-ID: <422c832273696a012f7cc79b09c98185f230c721.camel@microchip.com>
Date:   Tue, 17 Jan 2023 14:08:18 +0000
From:   <Arun.Ramadoss@...rochip.com>
To:     <mw@...ihalf.com>, <linux-kernel@...r.kernel.org>,
        <netdev@...r.kernel.org>, <linux-acpi@...r.kernel.org>
CC:     <andrew@...n.ch>, <olteanv@...il.com>, <vivien.didelot@...il.com>,
        <jaz@...ihalf.com>, <linux@...linux.org.uk>,
        <Samer.El-Haj-Mahmoud@....com>, <linus.walleij@...aro.org>,
        <f.fainelli@...il.com>, <sean.wang@...iatek.com>,
        <kuba@...nel.org>, <edumazet@...gle.com>, <pabeni@...hat.com>,
        <tn@...ihalf.com>, <Landen.Chao@...iatek.com>, <rafael@...nel.org>,
        <davem@...emloft.net>, <andriy.shevchenko@...ux.intel.com>,
        <hkallweit1@...il.com>
Subject: Re: [net-next: PATCH v4 2/8] net: mdio: switch fixed-link PHYs API to
 fwnode_

Hi Marcin,

On Mon, 2023-01-16 at 18:34 +0100, Marcin Wojtas wrote:
> fixed-link PHYs API is used by DSA and a number of drivers
> and was depending on of_. Switch to fwnode_ so to make it
> hardware description agnostic and allow to be used in ACPI
> world as well.
> 
> Signed-off-by: Marcin Wojtas <mw@...ihalf.com>
> ---
>  include/linux/fwnode_mdio.h    | 19 ++++
>  drivers/net/mdio/fwnode_mdio.c | 96 ++++++++++++++++++++
>  drivers/net/mdio/of_mdio.c     | 79 +---------------
>  3 files changed, 118 insertions(+), 76 deletions(-)
> 
>  #endif /* __LINUX_FWNODE_MDIO_H */
> diff --git a/drivers/net/mdio/fwnode_mdio.c
> b/drivers/net/mdio/fwnode_mdio.c
> index b782c35c4ac1..56f57381ae69 100644
> --- a/drivers/net/mdio/fwnode_mdio.c
> +++ b/drivers/net/mdio/fwnode_mdio.c
> @@ -10,6 +10,7 @@
>  #include <linux/fwnode_mdio.h>
>  #include <linux/of.h>
>  #include <linux/phy.h>
> +#include <linux/phy_fixed.h>
>  #include <linux/pse-pd/pse.h>
>  
>  MODULE_AUTHOR("Calvin Johnson <calvin.johnson@....nxp.com>");
> @@ -185,3 +186,98 @@ int fwnode_mdiobus_register_phy(struct mii_bus
> *bus,
>  	return rc;
>  }
>  EXPORT_SYMBOL(fwnode_mdiobus_register_phy);
> +
> +/*
> + * fwnode_phy_is_fixed_link() and fwnode_phy_register_fixed_link()
> must
> + * support two bindings:
> + * - the old binding, where 'fixed-link' was a property with 5
> + *   cells encoding various information about the fixed PHY
> + * - the new binding, where 'fixed-link' is a sub-node of the
> + *   Ethernet device.
> + */

networking comment style 

> +bool fwnode_phy_is_fixed_link(struct fwnode_handle *fwnode)
> +{
> +	struct fwnode_handle *fixed_link_node;
> +	const char *managed;
> +
> +	/* New binding */
> +	fixed_link_node = fwnode_get_named_child_node(fwnode, "fixed-
> link");
> +	if (fixed_link_node) {
> +		fwnode_handle_put(fixed_link_node);
> +		return true;
> +	}
> +
> +	if (fwnode_property_read_string(fwnode, "managed", &managed) ==
> 0 &&
> +	    strcmp(managed, "auto") != 0)
> +		return true;
> +
> +	/* Old binding */
> +	return fwnode_property_count_u32(fwnode, "fixed-link") == 5;
> +}
> +EXPORT_SYMBOL(fwnode_phy_is_fixed_link);
> +
> +int fwnode_phy_register_fixed_link(struct fwnode_handle *fwnode)
> +{
> +	struct fixed_phy_status status = {};
> +	struct fwnode_handle *fixed_link_node;

Reverse christmas tree

> +	u32 fixed_link_prop[5];
> +	const char *managed;
> +	int rc;
> +
> +	if (fwnode_property_read_string(fwnode, "managed", &managed) ==
> 0 &&
> +	    strcmp(managed, "in-band-status") == 0) {
> +		/* status is zeroed, namely its .link member */
> +		goto register_phy;
> +	}
> +
> +	/* New binding */
> +	fixed_link_node = fwnode_get_named_child_node(fwnode, "fixed-
> link");
> +	if (fixed_link_node) {
> +		status.link = 1;
> +		status.duplex =
> fwnode_property_present(fixed_link_node,
> +							"full-duplex");
> +		rc = fwnode_property_read_u32(fixed_link_node, "speed",
> +					      &status.speed);
> +		if (rc) {
> +			fwnode_handle_put(fixed_link_node);
> +			return rc;
> +		}
> +		status.pause = fwnode_property_present(fixed_link_node,
> "pause");
> +		status.asym_pause =
> fwnode_property_present(fixed_link_node,
> +							    "asym-
> pause");
> +		fwnode_handle_put(fixed_link_node);
> +
> +		goto register_phy;
> +	}
> +
> +	/* Old binding */
> +	rc = fwnode_property_read_u32_array(fwnode, "fixed-link",
> fixed_link_prop,
> +					    ARRAY_SIZE(fixed_link_prop)
> );
> +	if (rc)
> +		return rc;
> +
> +	status.link = 1;
> +	status.duplex = fixed_link_prop[1];
> +	status.speed  = fixed_link_prop[2];
> +	status.pause  = fixed_link_prop[3];
> +	status.asym_pause = fixed_link_prop[4];
> +
> +register_phy:
> +	return PTR_ERR_OR_ZERO(fixed_phy_register(PHY_POLL, &status,
> fwnode));
> +}
> +EXPORT_SYMBOL(fwnode_phy_register_fixed_link);
> +
> 
>