linux-kernel - Re: [PATCH v3 6/7] arm64: dts: xilinx: ultra96: Standardize LED labels and triggers

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Date:   Thu, 24 Jan 2019 10:49:30 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Michal Simek <michal.simek@...inx.com>
Cc:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Linux LED Subsystem <linux-leds@...r.kernel.org>,
        devicetree@...r.kernel.org,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        "open list:ARM/QUALCOMM SUPPORT" <linux-soc@...r.kernel.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Amit Kucheria <amit.kucheria@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>, koen.kooi@...aro.org,
        Nicolas Dechesne <nicolas.dechesne@...aro.org>
Subject: Re: [PATCH v3 6/7] arm64: dts: xilinx: ultra96: Standardize LED
 labels and triggers

On Fri, Dec 21, 2018 at 12:51 AM Michal Simek <michal.simek@...inx.com> wrote:
>
> On 21. 12. 18 3:37, Manivannan Sadhasivam wrote:
> > On Mon, Oct 29, 2018 at 03:12:44PM +0530, Manivannan Sadhasivam wrote:
> >> For all 96Boards, the following standard is used for onboard LEDs.
> >>
> >> green:user1  default-trigger: heartbeat
> >> green:user2  default-trigger: mmc0/disk-activity(onboard-storage)
> >> green:user3  default-trigger: mmc1 (SD-card)
> >> green:user4  default-trigger: none, panic-indicator
> >> yellow:wlan  default-trigger: phy0tx
> >> blue:bt      default-trigger: hci0-power
> >>
> >> So lets adopt the same for Ultra96, which is one of the 96Boards
> >> CE and AI platform. Since the WLAN and BT LEDs are hardwired onboard,
> >> consolidate only User LEDs.
> >>
> >
> > Hello,
> >
> > Any update on this patch?
>
> I am still waiting for reaction from Rob.
> We are keep trying to keep backward compatibility and this patch is
> breaking it that's why I want to know DT guys reaction on this change.

dts changes and backwards compatibility are ultimately up to the
platform maintainers. Your users can yell at you if they care. I only
ask that changes that break compatibility are documented as doing so.

Personally, I'm in favor of this change. I'd rather seem uniformity
across boards and this is just a dev board and LED functions won't
affect booting.

Rob