netdev - Re: [PATCH 0/2] Add LED mode behavior/select properties and handle

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Message-ID: <fuk5stahnpinahhyixdgeepchucvfbha3ikqagewxhxlh5337x@zuo46w4enzp4>
Date: Tue, 12 Nov 2024 09:49:03 +0100
From: Marek Behún <kabel@...nel.org>
To: Alexander Wilhelm <alexander.wilhelm@...termo.com>
Cc: Pavel Machek <pavel@....cz>, Ivan Mikhaylov <i.mikhaylov@...ro.com>, 
	linux-leds@...r.kernel.org, "David S . Miller" <davem@...emloft.net>, 
	Jakub Kicinski <kuba@...nel.org>, Rob Herring <robh+dt@...nel.org>, Andrew Lunn <andrew@...n.ch>, 
	Florian Fainelli <f.fainelli@...il.com>, Heiner Kallweit <hkallweit1@...il.com>, 
	Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] Add LED mode behavior/select properties and handle

On Tue, Nov 12, 2024 at 09:19:59AM +0100, Alexander Wilhelm wrote:
> Am Wed, Dec 16, 2020 at 11:41:19PM +0100 schrieb Pavel Machek:
> > Hi!
> > 
> > > In KSZ9131 PHY it is possible to control LEDs blink behavior via
> > > LED mode behavior and select registers. Add DTS properties plus handles
> > > of them inside micrel PHY driver.
> > > 
> > > I've some concerns about passing raw register values into LED mode
> > > select and behavior. It can be passed via array like in microchip
> > > driver(Documentation/devicetree/bindings/net/microchip,lan78xx.txt).
> > > There is the problem in this particular driver - there is a lot of other PHYs
> > > and led mode behavior/select states may intersect, that's the reason why
> > > I did it this way. Is there any good ways to make it look more
> > > properly?
> > 
> > Lets... not do this?
> > 
> > We have a LED subsystem which should probably control the LEDs... so
> > user can specify behaviours at run-time, instead of them being
> > hard-coded in the device tree.
> > 
> > Plus, LED subsystem will use same interface for networks LEDs as for
> > ... other LEDs.
> 
> Hi Pavel,
> 
> I would also like to control the LEDs via subsystem interface, but how I can
> configure those to be visible in 'sys/class/leds'? My LEDs are connected
> directly to KSZ9131RNX phy device and not to any of GPIO available on the CPU.
> Am I missing some DTS entries therefore?

The KSZ9131RNX driver needs to implement some LED methods, like
.led_brightness_set(), .led_blink_set(), .led_hw_is_supported(),
.led_hw_control_set(), .led_hw_control_get().

Look for example at marvell.c driver, or broadcom.c.

Regarding DTS, look at linux/arch/arm/boot/dts/marvell/armada-370-rd.dts.
The ethernet-phy@0 node has leds subnode, describing the LEDs.

Marek