linux-kernel - Re: [PATCH v3 0/4] Teach phylib hard-resetting devices

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Message-ID: <20171020090512.j6fkn2ohbxsuboxm@verge.net.au>
Date:   Fri, 20 Oct 2017 11:05:13 +0200
From:   Simon Horman <horms@...ge.net.au>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Magnus Damm <magnus.damm@...il.com>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/4] Teach phylib hard-resetting devices

On Fri, Oct 20, 2017 at 10:14:17AM +0200, Geert Uytterhoeven wrote:
> 	Hi David, Andrew, Florian, Simon, Magnus,
> 
> This patch series adds optional PHY reset support to phylib.
> 
> The first two patches are destined for David's net-next tree. They add
> core PHY reset code, and update a driver that currently uses its own
> reset code.  Note that these patches depend on "[PATCH v2] of_mdio: Fix
> broken PHY IRQ in case of probe deferral"
> (https://www.spinics.net/lists/linux-renesas-soc/msg19442.html), as v3
> needs to propagate errors from of_mdiobus_register_phy() and
> of_mdiobus_register_device() [1].
> 
> The last two patches are new (sort of, see [2]), and destined for
> Simon's renesas tree.  They add properties to describe the EthernetAVB
> PHY reset topology to the common Salvator-X/XS and ULCB DTS files, which
> solves two issues:
>   1. On Salvator-XS, the enable pin of the regulator providing PHY power
>      is connected to PRESETn, and PSCI powers down the SoC during system
>      suspend.  Hence a PHY reset is needed to restore network functionality
>      after resume.
>   2. Linux should not rely on the boot loader having reset the PHY, but
>      should reset the PHY during driver probe.
> 
> Changes compared to v2, as sent by Sergei Shtylyov:
>   - Fix fwnode_get_named_gpiod() call due to added parameters (which
>     allowed to eliminate the gpiod_direction_output() call),
>   - Rebased, refreshed, reworded,
>   - Take over from Sergei,
>   - Add Acked-by,
>   - Remove unneeded gpiod check, as gpiod_set_value() handles NULL fine,
>   - Handle fwnode_get_named_gpiod() errors correctly:
>       - -ENOENT is ignored (the GPIO is optional), and turned into NULL,
> 	which allowed to remove all later !IS_ERR() checks,
>       - Other errors (incl. -EPROBE_DEFER) are propagated [1],
>   - Extract DTS patches from series "[PATCH 0/4] ravb: Add PHY reset
>     support" (https://www.spinics.net/lists/netdev/msg457308.html), and
>     incorporate in this series, after moving reset-gpios from the
>     ethernet to the ethernet-phy node [2].
> 
> Thanks for your comments!
> 
> Geert Uytterhoeven (2):
>   arm64: dts: renesas: salvator-common: Add EthernetAVB PHY reset
>   arm64: dts: renesas: ulcb: Add EthernetAVB PHY reset

I have marked the above patches as deferred pending acceptance of
the other patches in this series. Please repost or otherwise ping
me once that has happened.

> 
> Sergei Shtylyov (2):
>   phylib: Add device reset GPIO support
>   macb: Kill PHY reset code
> 
>  Documentation/devicetree/bindings/net/phy.txt    |  2 ++
>  arch/arm64/boot/dts/renesas/salvator-common.dtsi |  1 +
>  arch/arm64/boot/dts/renesas/ulcb.dtsi            |  1 +
>  drivers/net/ethernet/cadence/macb.h              |  1 -
>  drivers/net/ethernet/cadence/macb_main.c         | 21 ---------------
>  drivers/net/phy/at803x.c                         | 18 +++----------
>  drivers/net/phy/mdio_bus.c                       |  4 +++
>  drivers/net/phy/mdio_device.c                    | 26 +++++++++++++++++--
>  drivers/net/phy/phy_device.c                     | 33 ++++++++++++++++++++++--
>  drivers/of/of_mdio.c                             | 23 +++++++++++++++++
>  include/linux/mdio.h                             |  3 +++
>  include/linux/phy.h                              |  5 ++++
>  12 files changed, 97 insertions(+), 41 deletions(-)
> 
> -- 
> 2.7.4
> 
> Gr{oetje,eeting}s,
> 
> 						Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
> 							    -- Linus Torvalds
>