On Thu, May 17, 2018 at 4:47 AM, <kgunda@xxxxxxxxxxxxxx> wrote: > On 2018-05-08 15:55, kgunda@xxxxxxxxxxxxxx wrote: >> >> On 2018-05-07 21:50, Bjorn Andersson wrote: >>> >>> On Thu 03 May 02:57 PDT 2018, Kiran Gunda wrote: >>> >>>> WLED4 peripheral is present on some PMICs like pmi8998 >>>> and pm660l. It has a different register map and also >>>> configurations are different. Add support for it. >>>> >>> >>> Several things are going on in this patch, it needs to be split to >>> not hide the functional changes from the structural/renames. >>> >> Ok. I will split it in the next series. >>>> >>>> Signed-off-by: Kiran Gunda <kgunda@xxxxxxxxxxxxxx> >>>> --- >>>> .../bindings/leds/backlight/qcom-wled.txt | 172 ++++- >>>> drivers/video/backlight/qcom-wled.c | 749 >>>> +++++++++++++++------ >>>> 2 files changed, 696 insertions(+), 225 deletions(-) >>>> >>>> diff --git >>>> a/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt >>>> b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt >>>> index fb39e32..0ceffa1 100644 >>>> --- a/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt >>>> +++ b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt >>>> @@ -1,30 +1,129 @@ >>>> Binding for Qualcomm Technologies, Inc. WLED driver >>>> >>>> -Required properties: >>>> -- compatible: should be "qcom,pm8941-wled" >>>> -- reg: slave address >>>> - >>>> -Optional properties: >>>> -- default-brightness: brightness value on boot, value from: 0-4095 >>>> - default: 2048 >>>> -- label: The name of the backlight device >>>> -- qcom,cs-out: bool; enable current sink output >>>> -- qcom,cabc: bool; enable content adaptive backlight control >>>> -- qcom,ext-gen: bool; use externally generated modulator signal to dim >>>> -- qcom,current-limit: mA; per-string current limit; value from 0 to 25 >>>> - default: 20mA >>>> -- qcom,current-boost-limit: mA; boost current limit; one of: >>>> - 105, 385, 525, 805, 980, 1260, 1400, 1680 >>>> - default: 805mA >>>> -- qcom,switching-freq: kHz; switching frequency; one of: >>>> - 600, 640, 685, 738, 800, 872, 960, 1066, 1200, 1371, >>>> - 1600, 1920, 2400, 3200, 4800, 9600, >>>> - default: 1600kHz >>>> -- qcom,ovp: V; Over-voltage protection limit; one of: >>>> - 27, 29, 32, 35 >>>> - default: 29V >>>> -- qcom,num-strings: #; number of led strings attached; value from 1 to >>>> 3 >>>> - default: 2 >>>> +WLED (White Light Emitting Diode) driver is used for controlling >>>> display >>>> +backlight that is part of PMIC on Qualcomm Technologies, Inc. reference >>>> +platforms. The PMIC is connected to the host processor via SPMI bus. >>>> + >>>> +- compatible >>>> + Usage: required >>>> + Value type: <string> >>>> + Definition: should be "qcom,pm8941-wled" or >>>> "qcom,pmi8998-wled". >>>> + or "qcom,pm660l-wled". >>> >>> >>> Better written as >>> >>> should be one of: >>> X >>> Y >>> Z >>> >> Will do it in the next series. >>>> >>>> + >>>> +- reg >>>> + Usage: required >>>> + Value type: <prop encoded array> >>>> + Definition: Base address of the WLED modules. >>>> + >>>> +- interrupts >>>> + Usage: optional >>>> + Value type: <prop encoded array> >>>> + Definition: Interrupts associated with WLED. Interrupts can be >>>> + specified as per the encoding listed under >>>> + Documentation/devicetree/bindings/spmi/ >>>> + qcom,spmi-pmic-arb.txt. >>> >>> >>> Better to describe that this should be the "short" and "ovp" interrupts >>> in this property than in the interrupt-names. >>> >> Ok. I will do it in the next series. >>>> >>>> + >>>> +- interrupt-names >>>> + Usage: optional >>>> + Value type: <string> >>>> + Definition: Interrupt names associated with the interrupts. >>>> + Must be "short" and "ovp". The short circuit >>>> detection >>>> + is not supported for PM8941. >>>> + >>>> +- label >>>> + Usage: required >>>> + Value type: <string> >>>> + Definition: The name of the backlight device >>>> + >>>> +- default-brightness >>>> + Usage: optional >>>> + Value type: <u32> >>>> + Definition: brightness value on boot, value from: 0-4095 >>>> + Default: 2048 >>>> + >>>> +- qcom,current-limit >>>> + Usage: optional >>>> + Value type: <u32> >>>> + Definition: uA; per-string current limit >>> >>> >>> You can't change unit on an existing property, that breaks any existing >>> dts using the qcom,pm8941-wled compatible. >>> >> >>>> + value: >>>> + For pm8941: from 0 to 25000 with 5000 ua step >>>> + Default 20000 uA >>>> + For pmi8998: from 0 to 30000 with 5000 ua step >>>> + Default 25000 uA. >>> >>> >>> These values could be described just as well in mA, so keep the original >>> unit - in particular since the boot-limit is in mA... >>> >> Ok. Will keep the original as is in the next series. > > Here, I may have to go with the approach as in "qcom,ovp". Because for > pm8941 > the current step is 1 mA (I have wrongly mentioned as 5000uA here) and for > PMI8998 > the current step is 2.5 mA. Hence, I will add another variable > "qcom,current-limit-ua" > just like "qcom,ovp-mv". Use unit suffixes defined in bindings/property-units.txt. Rob -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
