linux-kernel - Re: [RFC PATCH 3/6] leds: add function to configure offload leds

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Message-ID: <01b92118-8447-56d5-92a0-5fbf4a9aec85@infradead.org>
Date:   Sun, 7 Nov 2021 14:45:46 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Ansuel Smith <ansuelsmth@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Jonathan Corbet <corbet@....net>, Pavel Machek <pavel@....cz>,
        John Crispin <john@...ozen.org>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-leds@...r.kernel.org
Subject: Re: [RFC PATCH 3/6] leds: add function to configure offload leds

On 11/7/21 9:57 AM, Ansuel Smith wrote:
> diff --git a/Documentation/leds/leds-class.rst b/Documentation/leds/leds-class.rst
> index ab50b58d6a21..af84cce09068 100644
> --- a/Documentation/leds/leds-class.rst
> +++ b/Documentation/leds/leds-class.rst
> @@ -191,6 +191,18 @@ If the second argument (enable) to the trigger_offload() method is false, any
>   active HW offloading must be deactivated. In this case errors are not permitted
>   in the trigger_offload() method.
>   
> +The offload trigger will use the function configure_offload() provided by the driver
> +that will configure the offloaded mode for the LED.
> +This function pass as the first argument (offload_flags) a u32 flag, it's in the LED

                  passes                                           flag. It's

> +driver interest how to elaborate this flags and to declare support for a particular

                                          flag
although that sentence is not very clear.

> +offload trigger.
> +The second argument (cmd) of the configure_offload() method can be used to do various
> +operation for the specific trigger. We currently support ENABLE, DISABLE and READ to

    operations

> +enable, disable and read the state of the offload trigger for the LED driver.
> +If the driver return -ENOTSUPP on configure_offload, the trigger activation will

                  returns

> +fail as the driver doesn't support that specific offload trigger or don't know

                                                                        doesn't know

> +how to handle the provided flags.


-- 
~Randy