linux-kernel - Re: [PATCH v3 2/9] dt: bindings: Add multicolor class dt bindings documention

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Date:   Tue, 18 Jun 2019 09:36:35 -0600
From:   Rob Herring <robh@...nel.org>
To:     Dan Murphy <dmurphy@...com>
Cc:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, devicetree@...r.kernel.org,
        Linux LED Subsystem <linux-leds@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/9] dt: bindings: Add multicolor class dt bindings documention

On Fri, Jun 14, 2019 at 11:18 AM Dan Murphy <dmurphy@...com> wrote:
>
> Rob
>
> Thanks for the review
>
> On 6/14/19 12:00 PM, Rob Herring wrote:
> > On Thu, May 23, 2019 at 02:08:13PM -0500, Dan Murphy wrote:
> >> Add DT bindings for the LEDs multicolor class framework.
> >>
> >> Signed-off-by: Dan Murphy <dmurphy@...com>
> >> ---
> >>   .../bindings/leds/leds-class-multicolor.txt   | 97 +++++++++++++++++++
> >>   1 file changed, 97 insertions(+)
> >>   create mode 100644 Documentation/devicetree/bindings/leds/leds-class-multicolor.txt
> >>
> >> diff --git a/Documentation/devicetree/bindings/leds/leds-class-multicolor.txt b/Documentation/devicetree/bindings/leds/leds-class-multicolor.txt
> >> new file mode 100644
> >> index 000000000000..e2a2ce3279cb
> >> --- /dev/null
> >> +++ b/Documentation/devicetree/bindings/leds/leds-class-multicolor.txt
> >> @@ -0,0 +1,97 @@
> >> +* Multicolor LED properties
> >> +
> >> +Multicolor LEDs can consist of a RGB, RGBW or a RGBA LED clusters.  These devices
> >> +can be grouped together and also provide a modeling mechanism so that the
> >> +cluster LEDs can vary in hue and intensity to produce a wide range of colors.
> >> +
> >> +The nodes and properties defined in this document are unique to the multicolor
> >> +LED class.  Common LED nodes and properties are inherited from the common.txt
> >> +within this documentation directory.
> >> +
> >> +Required LED Child properties:
> >> +    - color : For multicolor LED support this property should be defined as
> >> +              LED_COLOR_ID_MULTI and further definition can be found in
> >> +              include/linux/leds/common.h.
> >> +
> >> +led-controller@30 {
> >> +    #address-cells = <1>;
> >> +    #size-cells = <0>;
> >> +    compatible = "ti,lp5024";
> >> +    reg = <0x29>;
> >> +
> >> +    multi-led@4 {
> > Typically we sort by address order.
>
> These are not addresses these end up being the "module" number that the
> LEDs below are associated to.

'reg' (and the unit-address) is an address in the sense that is how
you identify a device or sub-device. It doesn't matter what type of
'address' it is, DT practice is to sort node in unit-address numerical
order.

'module' is a h/w thing, right? A bank or instance within the device?
If not, using 'reg' here is not appropriate.

Rob