linux-kernel - Re: [PATCH v2] of: property: fw_devlink: Add support for "phy-handle" property

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Message-ID: <0a2c4106-7f48-2bb5-048e-8c001a7c3fda@samsung.com>
Date:   Mon, 23 Aug 2021 14:08:48 +0200
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Saravana Kannan <saravanak@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>, netdev@...r.kernel.org,
        kernel-team@...roid.com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Neil Armstrong <narmstrong@...libre.com>,
        linux-amlogic@...ts.infradead.org
Subject: Re: [PATCH v2] of: property: fw_devlink: Add support for
 "phy-handle" property

Hi,

On 18.08.2021 04:17, Saravana Kannan wrote:
> Allows tracking dependencies between Ethernet PHYs and their consumers.
>
> Cc: Andrew Lunn <andrew@...n.ch>
> Cc: netdev@...r.kernel.org
> Signed-off-by: Saravana Kannan <saravanak@...gle.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.

> ---
> v1 -> v2:
> - Fixed patch to address my misunderstanding of how PHYs get
>    initialized.
>
>   drivers/of/property.c | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/drivers/of/property.c b/drivers/of/property.c
> index 931340329414..0c0dc2e369c0 100644
> --- a/drivers/of/property.c
> +++ b/drivers/of/property.c
> @@ -1291,6 +1291,7 @@ DEFINE_SIMPLE_PROP(pwms, "pwms", "#pwm-cells")
>   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_SUFFIX_PROP(regulators, "-supply", NULL)
>   DEFINE_SUFFIX_PROP(gpio, "-gpio", "#gpio-cells")
>   
> @@ -1379,6 +1380,7 @@ static const struct supplier_bindings of_supplier_bindings[] = {
>   	{ .parse_prop = parse_resets, },
>   	{ .parse_prop = parse_leds, },
>   	{ .parse_prop = parse_backlight, },
> +	{ .parse_prop = parse_phy_handle, },
>   	{ .parse_prop = parse_gpio_compat, },
>   	{ .parse_prop = parse_interrupts, },
>   	{ .parse_prop = parse_regulators, },

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland