From: Andrew Lunn <andrew@lunn.ch>
To: Ansuel Smith <ansuelsmth@gmail.com>
Cc: "Marek Behún" <kabel@kernel.org>,
"Vivien Didelot" <vivien.didelot@gmail.com>,
"Florian Fainelli" <f.fainelli@gmail.com>,
"Vladimir Oltean" <olteanv@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
"Jakub Kicinski" <kuba@kernel.org>,
"Rob Herring" <robh+dt@kernel.org>,
"Jonathan Corbet" <corbet@lwn.net>, "Pavel Machek" <pavel@ucw.cz>,
"John Crispin" <john@phrozen.org>,
netdev@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
linux-leds@vger.kernel.org
Subject: Re: [RFC PATCH v3 2/8] leds: add function to configure hardware controlled LED
Date: Tue, 9 Nov 2021 21:49:35 +0100 [thread overview]
Message-ID: <YYre31rVDcs8OWre@lunn.ch> (raw)
In-Reply-To: <YYqEPZpGmjNgFj0L@Ansuel-xps.localdomain>
> > > +#ifdef CONFIG_LEDS_HARDWARE_CONTROL
> > > +enum blink_mode_cmd {
> > > + BLINK_MODE_ENABLE, /* Enable the hardware blink mode */
> > > + BLINK_MODE_DISABLE, /* Disable the hardware blink mode */
> > > + BLINK_MODE_READ, /* Read the status of the hardware blink mode */
> > > + BLINK_MODE_SUPPORTED, /* Ask the driver if the hardware blink mode is supported */
> > > + BLINK_MODE_ZERO, /* Disable any hardware blink active */
> > > +};
> > > +#endif
> >
> > this is a strange proposal for the API.
> >
> > Anyway, led_classdev already has the blink_set() method, which is documented as
> > /*
> > * Activate hardware accelerated blink, delays are in milliseconds
> > * and if both are zero then a sensible default should be chosen.
> > * The call should adjust the timings in that case and if it can't
> > * match the values specified exactly.
> > * Deactivate blinking again when the brightness is set to LED_OFF
> > * via the brightness_set() callback.
> > */
> > int (*blink_set)(struct led_classdev *led_cdev,
> > unsigned long *delay_on,
> > unsigned long *delay_off);
> >
> > So we already have a method to set hardware blkinking, we don't need
> > another one.
> >
> > Marek
>
> But that is about hardware blink, not a LED controlled by hardware based
> on some rules/modes.
> Doesn't really match the use for the hardware control.
> Blink_set makes the LED blink contantly at the declared delay.
> The blink_mode_cmd are used to request stuff to a LED in hardware mode.
>
> Doesn't seem correct to change/enhance the blink_set function with
> something that would do something completely different.
Humm. I can see merits for both.
What i like about reusing blink_set() is that it is well understood.
There is a defined sysfs API for it. ledtrig-oneshot.c also uses it,
for a non-repeating blink. So i think that also fits the PHY LED use
case.
Andrew
next prev parent reply other threads:[~2021-11-09 20:49 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-09 2:26 [RFC PATCH v3 0/8] Adds support for PHY LEDs with offload triggers Ansuel Smith
2021-11-09 2:26 ` [RFC PATCH v3 1/8] leds: add support for hardware driven LEDs Ansuel Smith
2021-11-09 6:16 ` Randy Dunlap
2021-11-09 20:34 ` Andrew Lunn
2021-11-09 20:40 ` Ansuel Smith
2021-11-09 2:26 ` [RFC PATCH v3 2/8] leds: add function to configure hardware controlled LED Ansuel Smith
2021-11-09 3:01 ` Marek Behún
2021-11-09 14:22 ` Ansuel Smith
2021-11-09 20:49 ` Andrew Lunn [this message]
2021-11-10 19:51 ` Ansuel Smith
2021-11-10 22:24 ` Andrew Lunn
2021-11-09 22:18 ` Marek Behún
2021-11-09 6:12 ` Randy Dunlap
2021-11-09 2:26 ` [RFC PATCH v3 3/8] leds: trigger: netdev: drop NETDEV_LED_MODE_LINKUP from mode Ansuel Smith
2021-11-09 3:02 ` Marek Behún
2021-11-09 14:24 ` Ansuel Smith
2021-11-09 20:53 ` Andrew Lunn
2021-11-09 2:26 ` [RFC PATCH v3 4/8] leds: trigger: netdev: rename and expose NETDEV trigger enum modes Ansuel Smith
2021-11-09 20:58 ` Andrew Lunn
2021-11-10 19:57 ` Ansuel Smith
2021-11-10 22:29 ` Andrew Lunn
2021-11-09 2:26 ` [RFC PATCH v3 5/8] leds: trigger: netdev: add hardware control support Ansuel Smith
2021-11-09 3:12 ` Marek Behún
2021-11-09 15:02 ` Ansuel Smith
2021-11-09 2:26 ` [RFC PATCH v3 6/8] leds: trigger: add hardware-phy-activity trigger Ansuel Smith
2021-11-09 3:25 ` Marek Behún
2021-11-09 21:09 ` Andrew Lunn
2021-11-10 20:04 ` Ansuel Smith
2021-11-10 22:32 ` Andrew Lunn
2021-11-09 6:02 ` Randy Dunlap
2021-11-09 15:06 ` Ansuel Smith
2021-11-09 21:17 ` Andrew Lunn
2021-11-09 21:28 ` Andrew Lunn
2021-11-09 2:26 ` [RFC PATCH v3 7/8] net: dsa: qca8k: add LEDs support Ansuel Smith
2021-11-09 6:03 ` Randy Dunlap
2021-11-09 21:22 ` Andrew Lunn
2021-11-09 2:26 ` [RFC PATCH v3 8/8] dt-bindings: net: dsa: qca8k: add LEDs definition example Ansuel Smith
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