From: Andrew Lunn <andrew@lunn•ch>
To: Brad Mouring <brad.mouring@ni•com>
Cc: Nicolas Ferre <nicolas.ferre@microchip•com>,
Rob Herring <robh+dt@kernel•org>,
"David S . Miller" <davem@davemloft•net>,
Michael Grzeschik <m.grzeschik@pengutronix•de>,
Mark Rutland <mark.rutland@arm•com>,
netdev@vger•kernel.org, Julia Cartwright <julia@ni•com>,
devicetree@vger•kernel.org, linux-kernel@vger•kernel.org
Subject: Re: [1/2] net: macb: Add phy-handle DT support
Date: Thu, 8 Mar 2018 18:32:47 +0100 [thread overview]
Message-ID: <20180308173247.GA22340@lunn.ch> (raw)
In-Reply-To: <20180307224257.1959-1-brad.mouring@ni.com>
On Wed, Mar 07, 2018 at 04:42:56PM -0600, Brad Mouring wrote:
> This optional binding (as described in the ethernet DT bindings doc)
> directs the netdev to the phydev to use. This is useful for a phy
> chip that has >1 phy in it, and two netdevs are using the same phy
> chip (i.e. the second mac's phy lives on the first mac's MDIO bus)
>
> The devicetree snippet would look something like this:
>
> ethernet@feedf00d {
> ...
> phy-handle = <&phy0> // the first netdev is physically wired to phy0
> ...
> phy0: phy@0 {
> ...
> reg = <0x0> // MDIO address 0
> ...
> }
> phy1: phy@1 {
> ...
> reg = <0x1> // MDIO address 1
> ...
> }
> ...
> }
>
> ethernet@deadbeef {
> ...
> phy-handle = <&phy1> // tells the driver to use phy1 on the
> // first mac's mdio bus (it's wired thusly)
> ...
> }
>
> The work done to add the phy_node in the first place (dacdbb4dfc1a1:
> "net: macb: add fixed-link node support") will consume the
> device_node (if found).
>
> Signed-off-by: Brad Mouring <brad.mouring@ni•com>
> ---
> drivers/net/ethernet/cadence/macb_main.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
> index e84afcf1ecb5..cc5b9e6e3526 100644
> --- a/drivers/net/ethernet/cadence/macb_main.c
> +++ b/drivers/net/ethernet/cadence/macb_main.c
> @@ -567,6 +567,9 @@ static int macb_mii_init(struct macb *bp)
>
> err = mdiobus_register(bp->mii_bus);
> } else {
> + /* attempt to find a phy-handle */
> + bp->phy_node = of_parse_phandle(np, "phy-handle", 0);
> +
> /* try dt phy registration */
> err = of_mdiobus_register(bp->mii_bus, np);
>
Hi Brad
I think it is more logical to do this in macb_mii_probe().
I would probably also move the fixed_link code from macb_mii_init() to
macb_mii_probe(). I would probably also move the fallback to standard
phy registration. Make macb_mii_init() about registering the MDIO bus,
and macb_mii_probe() about probing the MDIO bus to find the PHY to
use. At the moment, it is all rather mixed up.
Andrew
next prev parent reply other threads:[~2018-03-08 17:32 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-07 22:42 [PATCH 1/2] net: macb: Add phy-handle DT support Brad Mouring
2018-03-07 22:42 ` [PATCH 2/2] Documentation: macb: Document phy-handle optional binding Brad Mouring
2018-03-08 17:32 ` Andrew Lunn [this message]
2018-03-08 22:00 ` [1/2] net: macb: Add phy-handle DT support Brad Mouring
2018-03-09 22:12 ` [PATCH v2 net-next 1/3] net: macb: Reorganize macb_mii bringup Brad Mouring
2018-03-09 22:12 ` [PATCH v2 net-next 2/3] net: macb: Add phy-handle DT support Brad Mouring
2018-03-09 22:12 ` [PATCH v2 net-next 3/3] Documentation: macb: Document phy-handle optional binding Brad Mouring
2018-03-10 16:18 ` Andrew Lunn
2018-03-10 16:17 ` [PATCH v2 net-next 1/3] net: macb: Reorganize macb_mii bringup Andrew Lunn
2018-03-10 22:19 ` Brad Mouring
2018-03-12 17:09 ` [PATCH v3 net-next 0/4] macb: Introduce phy-handle DT functionality Brad Mouring
2018-03-12 17:09 ` [PATCH v3 net-next 1/4] net: macb: Reorganize macb_mii bringup Brad Mouring
2018-03-12 17:17 ` Florian Fainelli
2018-03-13 4:25 ` kbuild test robot
2018-03-12 17:09 ` [PATCH v3 net-next 2/4] net: macb: Remove redundant poll irq assignment Brad Mouring
2018-03-12 17:17 ` Florian Fainelli
2018-03-12 17:10 ` [PATCH v3 net-next 3/4] net: macb: Add phy-handle DT support Brad Mouring
2018-03-12 17:59 ` Andrew Lunn
2018-03-12 21:34 ` [PATCH v4 net-next 0/4] Brad Mouring
2018-03-12 21:34 ` [PATCH v4 net-next 1/4] net: macb: Reorganize macb_mii bringup Brad Mouring
2018-03-12 21:34 ` [PATCH v4 net-next 2/4] net: macb: Remove redundant poll irq assignment Brad Mouring
2018-03-12 21:34 ` [PATCH v4 net-next 3/4] net: macb: Add phy-handle DT support Brad Mouring
2018-03-12 21:57 ` Andrew Lunn
2018-03-12 22:30 ` Florian Fainelli
2018-03-13 13:49 ` Brad Mouring
2018-03-13 21:32 ` [PATCH v5 net-next 0/4] net: macb: Introduce phy-handle DT functionality Brad Mouring
2018-03-13 21:32 ` [PATCH v5 net-next 1/4] net: macb: Reorganize macb_mii bringup Brad Mouring
2018-03-13 21:32 ` [PATCH v5 net-next 2/4] net: macb: Remove redundant poll irq assignment Brad Mouring
2018-03-13 21:32 ` [PATCH v5 net-next 3/4] net: macb: Add phy-handle DT support Brad Mouring
2018-03-13 21:32 ` [PATCH v5 net-next 4/4] Documentation: macb: Document phy-handle binding Brad Mouring
2018-03-16 15:15 ` [PATCH v5 net-next 0/4] net: macb: Introduce phy-handle DT functionality David Miller
2018-03-12 21:34 ` [PATCH v4 net-next 4/4] Documentation: macb: Document phy-handle binding Brad Mouring
2018-03-12 17:10 ` [PATCH v3 " Brad Mouring
2018-03-12 17:18 ` Florian Fainelli
2018-03-11 7:02 ` [PATCH v2 net-next 1/3] net: macb: Reorganize macb_mii bringup kbuild test robot
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