linux-kernel - Re: [PATCH 00/12] Rework PHY reset handling

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Message-ID: <da635af8-2052-40d5-846f-eda14af8c69b@lunn.ch>
Date:   Wed, 5 Apr 2023 14:32:08 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Marco Felsch <m.felsch@...gutronix.de>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Richard Cochran <richardcochran@...il.com>,
        Radu Pirea <radu-nicolae.pirea@....nxp.com>,
        Shyam Sundar S K <Shyam-sundar.S-k@....com>,
        Yisen Zhuang <yisen.zhuang@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Iyappan Subramanian <iyappan@...amperecomputing.com>,
        Keyur Chudgar <keyur@...amperecomputing.com>,
        Quan Nguyen <quan@...amperecomputing.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        devicetree@...r.kernel.org, kernel@...gutronix.de
Subject: Re: [PATCH 00/12] Rework PHY reset handling

On Wed, Apr 05, 2023 at 11:26:51AM +0200, Marco Felsch wrote:
> The current phy reset handling is broken in a way that it needs
> pre-running firmware to setup the phy initially. Since the very first
> step is to readout the PHYID1/2 registers before doing anything else.
> 
> The whole dection logic will fall apart if the pre-running firmware
> don't setup the phy accordingly or the kernel boot resets GPIOs states
> or disables clocks. In such cases the PHYID1/2 read access will fail and
> so the whole detection will fail.
> 
> I fixed this via this series, the fix will include a new kernel API
> called phy_device_atomic_register() which will do all necessary things
> and return a 'struct phy_device' on success. So setting up a phy and the
> phy state machine is more convenient.

Please add a section explaining why the current API is broken beyond
repair.  You need to justify adding a new call, rather than fixing the
existing code to just do what is necessary to allow the PHY to be
found.

	Andrew