netdev - Re: [PATCH 2/2] dsa: mv88e6xxx: make serdes SGMII/Fiber output amplitude configurable

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Date:   Fri, 26 Nov 2021 22:49:54 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Marek Behún <kabel@...nel.org>
Cc:     Holger Brunck <holger.brunck@...achienergy.com>,
        netdev@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH 2/2] dsa: mv88e6xxx: make serdes SGMII/Fiber output
 amplitude configurable

> You're right, device_property_read() needs a device, and this seems
> like a port-specific property. But from the patch it seems Holger is
> using the switch device node:
> 
>   struct device_node *np = chip->dev->of_node;
> 
> so either this is wrong or he could use device_property API.

I already commented it should be a port property, probably to patch
1/2.

> Of course
> that would need a complete conversion, with device_* or fwnode_*.
> functions. I was wondering if device_* + fwnode_* functions are
> preferred instead of of_* functions (since they can be used also with
> ACPI, for example).

I doubt ACPI is ever going to happen for DSA. Despite the A in ACPI,
ACPI is for simple hardware, server and desktop like hardware.

   Andrew