linux-kernel - Re: [net-next RFC PATCH 04/14] net: phy: add initial support for PHY package in DT

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Date:   Wed, 22 Nov 2023 10:41:34 +0000
From:   Simon Horman <horms@...nel.org>
To:     Christian Marangi <ansuelsmth@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Florian Fainelli <florian.fainelli@...adcom.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Daniel Golle <daniel@...rotopia.org>,
        Qingfang Deng <dqfext@...il.com>,
        SkyLake Huang <SkyLake.Huang@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        David Epping <david.epping@...singlinkelectronics.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        Harini Katakam <harini.katakam@....com>,
        Robert Marko <robert.marko@...tura.hr>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [net-next RFC PATCH 04/14] net: phy: add initial support for PHY
 package in DT

On Mon, Nov 20, 2023 at 02:50:31PM +0100, Christian Marangi wrote:
> Add initial support for PHY package in DT.
> 
> Make it easier to define PHY package and describe the global PHY
> directly in DT by refereincing them by phandles instead of custom
> functions in each PHY driver.
> 
> Each PHY in a package needs to be defined in a dedicated node in the
> mdio node. This dedicated node needs to have the compatible set to
> "ethernet-phy-package" and define "global-phys" and "#global-phy-cells"
> respectively to a list of phandle to the global phy to define for the
> PHY package and 0 for cells as the phandle won't take any args.
> 
> With this defined, the generic PHY probe will join each PHY in this
> dedicated node to the package.
> 
> PHY driver MUST set the required global PHY count in
> .phy_package_global_phy_num to correctly verify that DT define the
> correct number of phandle to the required global PHY.
> 
> mdio_bus.c and of_mdio.c is updated to now support and parse also
> PHY package subnote that have the compatible "phy-package".
> 
> Signed-off-by: Christian Marangi <ansuelsmth@...il.com>

...

> diff --git a/include/linux/phy.h b/include/linux/phy.h
> index c2bb3f0b9dda..5bf90c49e5bd 100644
> --- a/include/linux/phy.h
> +++ b/include/linux/phy.h
> @@ -339,6 +339,8 @@ struct mdio_bus_stats {
>   * phy_package_leave().
>   */
>  struct phy_package_shared {
> +	/* With PHY package defined in DT this points to the PHY package node */
> +	struct device_node *np;
>  	/* addrs list pointer */
>  	/* note that this pointer is shared between different phydevs.
>  	 * It is allocated and freed automatically by phy_package_join() and

Hi Christian,

a minor nit from my side: please add np to the kernel doc for
struct phy_package_shared.

> @@ -888,6 +890,8 @@ struct phy_led {
>   * @flags: A bitfield defining certain other features this PHY
>   *   supports (like interrupts)
>   * @driver_data: Static driver data
> + * @phy_package_global_phy_num: Num of the required global phy
> + *   for PHY package global configuration.
>   *
>   * All functions are optional. If config_aneg or read_status
>   * are not implemented, the phy core uses the genphy versions.

...