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

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Date:   Tue, 29 Jan 2019 14:17:31 +0100
From:   Michal Simek <michal.simek@...inx.com>
To:     Rob Herring <robh+dt@...nel.org>,
        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 24. 01. 19 17:49, Rob Herring wrote:
> 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.

Ok.

Then please fix the patch and do it in a way

label = "green:user1"; /* ds2 */

ds2 reflects name on schematics.

in ds4 case default trigger is changes to mmc1. It suggests sd/emmc but
on ultra96 it is sd slot and wifi on second slot.

ds5 - linux,default-trigger = "none"; looks weird. None trigger should
be simply ensured by removing that line.

Thanks,
Michal