From: Randy Dunlap <rdunlap@infradead.org>
To: "Ansuel Smith" <ansuelsmth@gmail.com>,
"Andrew Lunn" <andrew@lunn.ch>,
"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, "Marek Behún" <kabel@kernel.org>
Subject: Re: [RFC PATCH v4 2/8] leds: document additional use of blink_set for hardware control
Date: Wed, 10 Nov 2021 18:28:09 -0800 [thread overview]
Message-ID: <3c37f8c8-5c0a-302c-e68c-e6ac37cde695@infradead.org> (raw)
In-Reply-To: <20211111013500.13882-3-ansuelsmth@gmail.com>
Hi Ansuel,
Sorry -- I screwed this one up a little bit on the previous iteration.
On 11/10/21 5:34 PM, Ansuel Smith wrote:
> diff --git a/Documentation/leds/leds-class.rst b/Documentation/leds/leds-class.rst
> index 0175954717a3..c06a18b811de 100644
> --- a/Documentation/leds/leds-class.rst
> +++ b/Documentation/leds/leds-class.rst
> @@ -202,6 +202,23 @@ hardware mode and any software only trigger will reject activation.
> On init a LED driver that support a hardware mode should reset every blink mode
> set by default.
>
> +Once a trigger has declared support for hardware-controller blinks, it will use
hardware-controlled
> +blink_set() to try to offload his trigger on activation/configuration.
> +blink_set() will return 0 if the requested modes set in trigger_data can be
> +controlled by hardware or an error if both the mode bitmap is not supported by
maybe: if both of the bitmap modes are not supported by
> +the hardware or there was a problem in the configuration.
> +
> +Following blink_set logic, setting brightness to LED_OFF with hardware control active
> +will reset any active blink mode and disable hardware control setting the LED to off.
> +
> +It's in the LED driver's interest to know how to elaborate the trigger data and report support
> +for a particular set of blink modes. For this exact reason explicit support for the specific
> +trigger is mandatory or the driver returns -EOPNOTSUPP if asked to enter hardware mode
> +with a not supported trigger.
> +If the driver returns -EOPNOTSUPP on hw_control_configure(), the trigger activation will
> +fail as the driver doesn't support that specific hardware blink modes or doesn't know
mode
> +how to handle the provided trigger data.
thanks.
--
~Randy
next prev parent reply other threads:[~2021-11-11 2:28 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-11 1:34 [RFC PATCH v4 0/8] Adds support for PHY LEDs with offload triggers Ansuel Smith
2021-11-11 1:34 ` [RFC PATCH v4 1/8] leds: add support for hardware driven LEDs Ansuel Smith
2021-11-11 2:24 ` Randy Dunlap
2021-11-11 1:34 ` [RFC PATCH v4 2/8] leds: document additional use of blink_set for hardware control Ansuel Smith
2021-11-11 2:28 ` Randy Dunlap [this message]
2021-11-11 1:34 ` [RFC PATCH v4 3/8] leds: trigger: netdev: drop NETDEV_LED_MODE_LINKUP from mode Ansuel Smith
2021-11-11 1:34 ` [RFC PATCH v4 4/8] leds: trigger: netdev: rename and expose NETDEV trigger enum and struct Ansuel Smith
2021-11-11 1:34 ` [RFC PATCH v4 5/8] leds: trigger: netdev: add hardware control support Ansuel Smith
2021-11-11 1:34 ` [RFC PATCH v4 6/8] leds: trigger: add hardware-phy-activity trigger Ansuel Smith
2021-11-11 2:18 ` Randy Dunlap
2021-11-11 1:34 ` [RFC PATCH v4 7/8] net: dsa: qca8k: add LEDs support Ansuel Smith
2021-11-11 2:19 ` Randy Dunlap
2021-11-11 1:35 ` [RFC PATCH v4 8/8] dt-bindings: net: dsa: qca8k: add LEDs definition example Ansuel Smith
2021-11-11 2:16 ` [RFC PATCH v4 0/8] Adds support for PHY LEDs with offload triggers Marek Behún
2021-11-12 15:35 ` Ansuel Smith
2021-11-12 18:30 ` Marek Behún
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