linux-kernel - Re: [PATCH v3 1/3] leds: core: Introduce generic pattern interface

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Date:   Wed, 15 Nov 2017 08:36:42 +0100
From:   Greg KH <greg@...ah.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Richard Purdie <rpurdie@...ys.net>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, linux-kernel@...r.kernel.org,
        linux-leds@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, Fenglin Wu <fenglinw@...eaurora.org>
Subject: Re: [PATCH v3 1/3] leds: core: Introduce generic pattern interface

On Tue, Nov 14, 2017 at 11:13:43PM -0800, Bjorn Andersson wrote:
> Some LED controllers have support for autonomously controlling
> brightness over time, according to some preprogrammed pattern or
> function.
> 
> This adds a new optional operator that LED class drivers can implement
> if they support such functionality as well as a new device attribute to
> configure the pattern for a given LED.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
> 
> Changes since v2:
> - None
> 
> Changes since v1:
> - New patch, based on discussions following v1
> 
>  Documentation/ABI/testing/sysfs-class-led |  20 ++++
>  drivers/leds/led-class.c                  | 150 ++++++++++++++++++++++++++++++
>  include/linux/leds.h                      |  21 +++++
>  3 files changed, 191 insertions(+)
> 
> diff --git a/Documentation/ABI/testing/sysfs-class-led b/Documentation/ABI/testing/sysfs-class-led
> index 5f67f7ab277b..74a7f5b1f89b 100644
> --- a/Documentation/ABI/testing/sysfs-class-led
> +++ b/Documentation/ABI/testing/sysfs-class-led
> @@ -61,3 +61,23 @@ Description:
>  		gpio and backlight triggers. In case of the backlight trigger,
>  		it is useful when driving a LED which is intended to indicate
>  		a device in a standby like state.
> +
> +What:		/sys/class/leds/<led>/pattern
> +Date:		July 2017

That was many months ago :)

> +KernelVersion:	4.14

And that kernel version is long since released :)

thanks,

greg k-h