Re: [PATCH 6/6] arm64: dts: xilinx: ultra96: Standardize LED labels and triggers

[Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>]

On Wed, Oct 10, 2018 at 09:40:22AM +0200, Michal Simek wrote:
> On 10.10.2018 09:35, Manivannan Sadhasivam wrote:
> > Hi Michal,
> > 
> > On Wed, Oct 10, 2018 at 09:25:24AM +0200, Michal Simek wrote:
> >> On 9.10.2018 16:05, Manivannan Sadhasivam wrote:
> >>> For all 96Boards, the following standard is used for onboard LEDs.
> >>>
> >>> device-name:green:user1  default-trigger: heartbeat
> >>> device-name:green:user2  default-trigger: mmc0/disk-activity
> >>>                                           (onboard-storage)
> >>> device-name:green:user3  default-trigger: mmc1 (SD-card)
> >>> device-name:green:user4  default-trigger: none, panic-indicator
> >>> device-name:yellow:wlan  default-trigger: phy0tx
> >>> device-name: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.
> >>>
> >>> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> >>> ---
> >>>  arch/arm64/boot/dts/xilinx/zynqmp-zcu100-revC.dts | 15 ++++++++-------
> >>>  1 file changed, 8 insertions(+), 7 deletions(-)
> >>>
> >>> diff --git a/arch/arm64/boot/dts/xilinx/zynqmp-zcu100-revC.dts b/arch/arm64/boot/dts/xilinx/zynqmp-zcu100-revC.dts
> >>> index eb5e8bddb610..565ceb390f99 100644
> >>> --- a/arch/arm64/boot/dts/xilinx/zynqmp-zcu100-revC.dts
> >>> +++ b/arch/arm64/boot/dts/xilinx/zynqmp-zcu100-revC.dts
> >>> @@ -57,29 +57,30 @@
> >>>  	leds {
> >>>  		compatible = "gpio-leds";
> >>>  		ds2 {
> >>> -			label = "ds2";
> >>> +			label = "zynqmp-zcu100-revC:green:user1";
> >>
> >> The purpose of this series should be standardize Led labels that's why I
> >> would expect that leds will be called in the same way on all these
> >> boards that's why I am not getting why there is board name.
> >>
> >> green:user1 or just user1 should be enough.
> >>
> > 
> > Hmm. That's a good point. My proposal to standardize the labels is inspired from
> > Dragonboard410c dts [1]. They had the device name in label and I decided to
> > go with that. But as you said, the board name is not needed and just 
> > `color:led-name` should be fine.
> > 
> > Will modify this in next interation.
> 
> The second part of this is that all current DTSes are using some names
> and by changing it you will break compatibility which is something what
> you should avoid.
> That's why it is really a question if this change should be accepted.
>

You mean userspace compatibility? If yes, then the affected boards are using
MRAA library for providing the userspace access and I will ensure that it will
get updated to the new labels.

But for other userspace scripts which users might be depending on, it will
break for sure. So, I would like to get some feedback here from Rob.

Thanks,
Mani
 
> Thanks,
> Michal
>