linux-kernel - Re: [PATCH net-next 2/2] net: phy: adin: add support for setting led-, link-status-pin polarity

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Date: Sat, 20 Apr 2024 09:10:57 +0000
From: Josua Mayer <josua@...id-run.com>
To: Andrew Lunn <andrew@...n.ch>
CC: Michael Hennerich <michael.hennerich@...log.com>, "David S. Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Rob Herring
	<robh@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>, Alexandru Tachici
	<alexandru.tachici@...log.com>, Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>, Jon Nettleton <jon@...id-run.com>,
	Yazan Shhady <yazan.shhady@...id-run.com>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 2/2] net: phy: adin: add support for setting
 led-, link-status-pin polarity

Am 19.04.24 um 17:47 schrieb Andrew Lunn:
> On Fri, Apr 19, 2024 at 05:35:18PM +0200, Josua Mayer wrote:
>> ADIN1300 supports software control over pin polarity for both LED_0 and
>> LINK_ST pins.
>>
>> Configure the polarity during probe based on device-tree properties.
>>
>> Led polarity is only set if specified in device-tree, otherwise the phy
>> can choose either active-low or active-high based on external line
>> voltage. Link-status polarity is set to active-high as default if not
>> specified, which is always the reset-default.
>>
>> Signed-off-by: Josua Mayer <josua@...id-run.com>
> Hi Josua
>
> Please take a look at:
>
> commit 447b80a9330ef2d9a94fc5a9bf35b6eac061f38b
> Author: Alexander Stein <alexander.stein@...tq-group.com>
> Date:   Wed Jan 31 08:50:48 2024 +0100
>
>     net: phy: dp83867: Add support for active-low LEDs
>     
>     Add the led_polarity_set callback for setting LED polarity.
>     
>     Signed-off-by: Alexander Stein <alexander.stein@...tq-group.com>
>     Reviewed-by: Andrew Lunn <andrew@...n.ch>
>     Signed-off-by: David S. Miller <davem@...emloft.net>
>
>
>     Andrew
>
> ---

Hi Andrew,

That looks very much related!

I was already planning to investigate adding led support ... .

1. for the  LINK_ST pin I believe we still need a non-led-framework
device property for setting polarity, as it is a fixed function signal
that we can't even turn on or off from software.

2. LED_0 control not currently supported by adin driver.
The phy supports what data-sheet calls extended configuration
(disabled by default) for controlling led state (on, off, patterns).

Since it is not default, I see the polarity setting separate from leds.
However I do believe the led_polarity_set callback is an acceptable
solution.

I might prepare a reduced v2 for only the fixed-function link-status pin.

sincerely
Josua Mayer