linux-kernel - Re: [PATCH] dt-bindings: leds: Document commonly used LED triggers

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Date:   Thu, 10 Dec 2020 12:56:44 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
Cc:     jacek.anaszewski@...il.com, pavel@....cz, dmurphy@...com,
        robh+dt@...nel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: leds: Document commonly used LED triggers

On Thu, Dec 10, 2020 at 02:57:09PM +0800, Leizhen (ThunderTown) wrote:
> 
> 
> On 2020/12/10 14:14, Manivannan Sadhasivam wrote:
> > This commit documents the LED triggers used commonly in the SoCs. Not
> > all triggers are documented as some of them are very application specific.
> > Most of the triggers documented here are currently used in devicetrees
> > of many SoCs.
> > 
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > ---
> >  .../devicetree/bindings/leds/common.yaml      | 72 ++++++++++++++-----
> >  1 file changed, 54 insertions(+), 18 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/leds/common.yaml b/Documentation/devicetree/bindings/leds/common.yaml
> > index f1211e7045f1..eee4eb7a4535 100644
> > --- a/Documentation/devicetree/bindings/leds/common.yaml
> > +++ b/Documentation/devicetree/bindings/leds/common.yaml
> > @@ -79,24 +79,60 @@ properties:
> >        the LED.
> >      $ref: /schemas/types.yaml#definitions/string
> >  
> > -    enum:
> > -        # LED will act as a back-light, controlled by the framebuffer system
> > -      - backlight
> > -        # LED will turn on (but for leds-gpio see "default-state" property in
> > -        # Documentation/devicetree/bindings/leds/leds-gpio.yaml)
> > -      - default-on
> > -        # LED "double" flashes at a load average based rate
> > -      - heartbeat
> > -        # LED indicates disk activity
> > -      - disk-activity
> > -        # LED indicates IDE disk activity (deprecated), in new implementations
> > -        # use "disk-activity"
> > -      - ide-disk
> > -        # LED flashes at a fixed, configurable rate
> > -      - timer
> > -        # LED alters the brightness for the specified duration with one software
> > -        # timer (requires "led-pattern" property)
> > -      - pattern
> > +    oneOf:
> > +      - items:
> > +          - enum:
> > +                # LED will act as a back-light, controlled by the framebuffer system
> > +              - backlight
> > +                # LED will turn on (but for leds-gpio see "default-state" property in
> > +                # Documentation/devicetree/bindings/leds/leds-gpio.yaml)
> > +              - default-on
> > +                # LED "double" flashes at a load average based rate
> > +              - heartbeat
> > +                # LED indicates disk activity
> > +              - disk-activity
> > +                # LED indicates IDE disk activity (deprecated), in new implementations
> > +                # use "disk-activity"
> > +              - ide-disk
> > +                # LED flashes at a fixed, configurable rate
> > +              - timer
> > +                # LED alters the brightness for the specified duration with one software
> > +                # timer (requires "led-pattern" property)
> > +              - pattern
> > +                # LED indicates camera flash state
> > +              - flash
> > +                # LED indicates camera torch state
> > +              - torch
> > +                # LED indicates audio mute state
> > +              - audio-mute
> > +                # LED indicates mic mute state
> > +              - audio-micmute
> > +                # LED indicates bluetooth power state
> > +              - bluetooth-power
> > +                # LED indicates USB gadget activity
> > +              - usb-gadget
> > +                # LED indicates USB host activity
> > +              - usb-host
> > +                # LED indicates MTD memory activity
> > +              - mtd
> > +                # LED indicates NAND memory activity (deprecated),
> > +                # in new implementations use "mtd"
> > +              - nand-disk
> > +                # LED indicates disk read activity
> > +              - disk-read
> > +                # LED indicates disk write activity
> > +              - disk-write
> > +                # No trigger assigned to the LED. This is the default mode
> > +                # if trigger is absent
> > +              - none
> > +                # LED indicates activity of all CPUs
> > +              - cpu
> The triggers phy0tx and hci0-power are missed.
> 

Yes, I just reworked my previous patch. Will add them.

> Since you've rewritten it, please consider sorting these property strings
> in ascending alphabetical order.
> 

Makes sense!

> > +      - items:
> > +            # LED indicates activity of [N]th CPU
> > +          - pattern: "^cpu[0-9][0-9]$"
> should be ^cpu[0-9]{1,2}$, otherwise, it always requires two digit.
>

Aww... Yes. Will fix it.

> > +      - items:
> > +            # LED indicates [N]th MMC storage activity
> > +          - pattern: '^mmc[0-9][0-9]$'
> should be '^mmc[0-9]{1,2}$'
> 
> Why CPU use "", and mmc use ''，It's better to keep them consistent.
> 

Sure.

Thanks,
Mani

> >  
> >    led-pattern:
> >      description: |
> > 
>