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From: Saravana Kannan <saravanak@google.com>
To: Andrew Lunn <andrew@lunn.ch>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>,
	Rob Herring <robh+dt@kernel.org>,
	Frank Rowand <frowand.list@gmail.com>,
	netdev@vger.kernel.org, kernel-team@android.com,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	Neil Armstrong <narmstrong@baylibre.com>,
	linux-amlogic@lists.infradead.org
Subject: Re: [PATCH v2] of: property: fw_devlink: Add support for "phy-handle" property
Date: Mon, 23 Aug 2021 11:13:08 -0700	[thread overview]
Message-ID: <CAGETcx_eUE1gLAaqXdLjCb2XxttH20066kXs969khnrEZQ71mA@mail.gmail.com> (raw)
In-Reply-To: <YSOfvMIltzWPCKc/@lunn.ch>

On Mon, Aug 23, 2021 at 6:16 AM Andrew Lunn <andrew@lunn.ch> wrote:
>
> On Mon, Aug 23, 2021 at 02:08:48PM +0200, Marek Szyprowski wrote:
> > Hi,
> >
> > On 18.08.2021 04:17, Saravana Kannan wrote:
> > > Allows tracking dependencies between Ethernet PHYs and their consumers.
> > >
> > > Cc: Andrew Lunn <andrew@lunn.ch>
> > > Cc: netdev@vger.kernel.org
> > > Signed-off-by: Saravana Kannan <saravanak@google.com>
> >
> > This patch landed recently in linux-next as commit cf4b94c8530d ("of:
> > property: fw_devlink: Add support for "phy-handle" property"). It breaks
> > ethernet operation on my Amlogic-based ARM64 boards: Odroid C4
> > (arm64/boot/dts/amlogic/meson-sm1-odroid-c4.dts) and N2
> > (meson-g12b-odroid-n2.dts) as well as Khadas VIM3/VIM3l
> > (meson-g12b-a311d-khadas-vim3.dts and meson-sm1-khadas-vim3l.dts).
> >
> > In case of OdroidC4 I see the following entries in the
> > /sys/kernel/debug/devices_deferred:
> >
> > ff64c000.mdio-multiplexer
> > ff3f0000.ethernet
> >
> > Let me know if there is anything I can check to help debugging this issue.
>
> Hi Marek
>
> Please try this. Completetly untested, not even compile teseted:
>
> diff --git a/drivers/of/property.c b/drivers/of/property.c
> index 0c0dc2e369c0..7c4e257c0a81 100644
> --- a/drivers/of/property.c
> +++ b/drivers/of/property.c
> @@ -1292,6 +1292,7 @@ DEFINE_SIMPLE_PROP(resets, "resets", "#reset-cells")
>  DEFINE_SIMPLE_PROP(leds, "leds", NULL)
>  DEFINE_SIMPLE_PROP(backlight, "backlight", NULL)
>  DEFINE_SIMPLE_PROP(phy_handle, "phy-handle", NULL)
> +DEFINE_SIMPLE_PROP(mdio_parent_bus, "mdio-parent-bus", NULL);
>  DEFINE_SUFFIX_PROP(regulators, "-supply", NULL)
>  DEFINE_SUFFIX_PROP(gpio, "-gpio", "#gpio-cells")
>
> @@ -1381,6 +1382,7 @@ static const struct supplier_bindings of_supplier_bindings[] = {
>         { .parse_prop = parse_leds, },
>         { .parse_prop = parse_backlight, },
>         { .parse_prop = parse_phy_handle, },
> +       { .parse_prop = parse_mdio_parent_bus, },
>         { .parse_prop = parse_gpio_compat, },
>         { .parse_prop = parse_interrupts, },
>         { .parse_prop = parse_regulators, },

Looking at the code, I'm fairly certain that the device that
corresponds to a DT node pointed to by mdio-parent-bus will be a "bus"
device that's registered with the mdio_bus_class.

If my understanding is right, then Nak for this patch. It'll break a
lot of probes.

TL;DR is that stateful/managed device links don't make sense for
devices that are never probed/bound to a driver. I plan to improve
device links to try and accommodate these cases nicely, but that's in
my TO DO list. Until that's completed, this patch will break stuff.

-Saravana

  reply	other threads:[~2021-08-23 18:13 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-18  2:17 Saravana Kannan
2021-08-18 17:00 ` Rob Herring
     [not found] ` <CGME20210823120849eucas1p11d3919886444358472be3edd1c662755@eucas1p1.samsung.com>
2021-08-23 12:08   ` Marek Szyprowski
2021-08-23 12:42     ` Rob Herring
2021-08-23 13:16     ` Andrew Lunn
2021-08-23 18:13       ` Saravana Kannan [this message]
2021-08-23 19:50         ` Andrew Lunn
2021-08-24  6:52       ` Marek Szyprowski
2021-08-23 18:22     ` Saravana Kannan
2021-08-23 19:58       ` Andrew Lunn
2021-08-23 20:48         ` Saravana Kannan
2021-08-23 22:01           ` Andrew Lunn
2021-08-23 22:08           ` Rob Herring
2021-08-24  7:03       ` Marek Szyprowski
2021-08-24  7:31         ` Saravana Kannan
2021-09-01  2:37           ` Saravana Kannan
2021-09-01  7:22             ` Marek Szyprowski
2021-09-08 21:58               ` [PATCH v1] RFC: of: property: fix phy-hanlde issue Saravana Kannan
2021-09-09  8:03                 ` Marek Szyprowski
2021-09-14  0:54                   ` Saravana Kannan
2021-09-14  4:44                     ` Saravana Kannan
2021-09-14  6:15                       ` Marek Szyprowski

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