On Wed, 24 Feb 2016 17:04:49 +0100 Jacek Anaszewski <j.anaszewski@xxxxxxxxxxx> wrote: > Hi David, > > Thanks for the patch. > > On 02/23/2016 07:17 PM, David Rivshin (Allworx) wrote: > > From: David Rivshin <drivshin@xxxxxxxxxxx> > > > > This adds a binding description for the is31fl3236/35/18/16 I2C LED > > drivers. > > > > Signed-off-by: David Rivshin <drivshin@xxxxxxxxxxx> > > --- > > .../devicetree/bindings/leds/leds-is31fl32xx.txt | 51 ++++++++++++++++++++++ > > 1 file changed, 51 insertions(+) > > create mode 100644 Documentation/devicetree/bindings/leds/leds-is31fl32xx.txt > > > > diff --git a/Documentation/devicetree/bindings/leds/leds-is31fl32xx.txt b/Documentation/devicetree/bindings/leds/leds-is31fl32xx.txt > > new file mode 100644 > > index 0000000..0a05a1d > > --- /dev/null > > +++ b/Documentation/devicetree/bindings/leds/leds-is31fl32xx.txt > > @@ -0,0 +1,51 @@ > > +Binding for ISSI IS31FL32xx LED Drivers > > + > > +The IS31FL32xx family of LED drivers are I2C devices with multiple > > +constant-current channels, each with independent 256-level PWM control. > > +Each LED is represented as a sub-node of the device. > > + > > +Required properties: > > +- compatible: one of > > + issi,is31fl3236 > > + issi,is31fl3235 > > + issi,is31fl3218 > > + issi,is31fl3216 > > +- reg: I2C slave address > > +- address-cells : must be 1 > > +- size-cells : must be 0 > > + > > +LED sub-node properties: > > +- reg : LED channel number (1..N) > > +- max-brightness : (optional) Maximum brightness possible for the LED. > > Please use led-max-microamp instead. You can refer to > Documentation/devicetree/bindings/leds/common.txt for detailed > description. FYI, I think I got that property from leds-pwm, since these use PWMs internally, although I don't actually use it myself. I can see how led-max-microamp could be a useful property, however I'm uncertain about computing cdev->max_brightness from it as these devices look to control their max current via an external resistor. I suppose either the resistor value, or the resultant max-current would need to be given in the devicetree, and then that used along with led-max-microamp to compute cdev->max_brightness. Although I'd want it to be optional as I suspect most users don't need any restriction. Also, I don't think I can properly test the result, which always makes me nervous. Would it be acceptable to simply remove the max-brightness property without adding led-max-microamp? It can always be added if a user turns out to need it in the future. Or do you feel strongly that led-max-microamp should be in the binding from the start? > > > + Default is 255. > > +- label : (optional) > > + see Documentation/devicetree/bindings/leds/common.txt > > +- linux,default-trigger : (optional) > > + see Documentation/devicetree/bindings/leds/common.txt > > + > > + > > +Example: > > + > > +leds: is31fl3236@3c { > > + compatible = "issi,is31fl3236"; > > + reg = <0x3c>; > > You're missing address-cells and size-cells in this example. Indeed, I missed that when I renamed the child node property from 'chan' to 'reg'. > > > + > > + led@1 { > > + reg = <1>; > > + label = "EB:blue:usr0"; > > + max-brightness = <128>; > > + }; > > + led@2 { > > + reg = <2>; > > + label = "EB:blue:usr1"; > > + }; > > + ... > > + led@36 { > > + reg = <36>; > > + label = "EB:blue:usr35"; > > + max-brightness = <255>; > > + }; > > +}; > > + > > +For more product information please see the link below: > > +http://www.issi.com/US/product-analog-fxled-driver.shtml > > \ No newline at end of file > > > > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html