linux-kernel - Re: [PATCH v2 2/2] dt: bindings: tps65217: add compatible property for subnodes

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Message-ID: <CAJKbBDCSrPd=JGP2sfk1D-eNf55iYBKUqBtqA=4m6r5xL6oYnQ@mail.gmail.com>
Date:	Wed, 8 Oct 2014 11:14:50 +0200
From:	Johannes Pointner <johannes.pointner@...il.com>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] dt: bindings: tps65217: add compatible property
 for subnodes

2014-10-06 23:22 GMT+02:00 Lee Jones <lee.jones@...aro.org>:
> On Thu, 25 Sep 2014, Johannes Pointner wrote:
>
>> Add documentation for compatible property of subnodes.
>>
>> Signed-off-by: Johannes Pointner <johannes.pointner@...automation.com>
>> ---
>>  Documentation/devicetree/bindings/regulator/tps65217.txt         | 7 ++++++-
>>  .../devicetree/bindings/video/backlight/tps65217-backlight.txt   | 9 ++++++---
>>  2 files changed, 12 insertions(+), 4 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/regulator/tps65217.txt b/Documentation/devicetree/bindings/regulator/tps65217.txt
>> index 4f05d20..8ae3a3b 100644
>> --- a/Documentation/devicetree/bindings/regulator/tps65217.txt
>> +++ b/Documentation/devicetree/bindings/regulator/tps65217.txt
>> @@ -14,6 +14,9 @@ Required properties:
>>  Optional properties:
>>  - ti,pmic-shutdown-controller: Telling the PMIC to shutdown on PWR_EN toggle.
>>
>> +Required subnode properties:
>> +- compatible: "ti,tps65217-pmic"
>> +
>>    The valid names for regulators are:
>>    tps65217: dcdc1, dcdc2, dcdc3, ldo1, ldo2, ldo3 and ldo4
>>
>> @@ -23,9 +26,11 @@ Example:
>>
>>       tps: tps@24 {
>>               compatible = "ti,tps65217";
>> +             reg = <0x24>;
>>               ti,pmic-shutdown-controller;
>>
>> -             regulators {
>> +             tps_pmic: regulators {
>
> How is the tps_pmic label used?
>
>> +                     compatible = "ti,tps65217-pmic";
>
> I'd like to see a '\n' here.
I will add a newline here.
>
>>                       dcdc1_reg: dcdc1 {
>>                               regulator-min-microvolt = <900000>;
>>                               regulator-max-microvolt = <1800000>;
>> diff --git a/Documentation/devicetree/bindings/video/backlight/tps65217-backlight.txt b/Documentation/devicetree/bindings/video/backlight/tps65217-backlight.txt
>> index 5fb9279..f92f154 100644
>> --- a/Documentation/devicetree/bindings/video/backlight/tps65217-backlight.txt
>> +++ b/Documentation/devicetree/bindings/video/backlight/tps65217-backlight.txt
>> @@ -6,19 +6,22 @@ used to drive LEDs for use as backlights.
>>  Required properties:
>>  - compatible: "ti,tps65217"
>>  - reg: I2C slave address
>> -- backlight: node for specifying WLED1 and WLED2 lines in TPS65217
>> +- backlight: subnode for specifying WLED1 and WLED2 lines in TPS65217
>> +
>> +Required subnode properties:
>> +- compatible: "ti,tps65217-bl"
>>  - isel: selection bit, valid values: 1 for ISEL1 (low-level) and 2 for ISEL2 (high-level)
>>  - fdim: PWM dimming frequency, valid values: 100, 200, 500, 1000
>>  - default-brightness: valid values: 0-100
>>
>> -Each regulator is defined using the standard binding for regulators.
>>
>>  Example:
>>
>>       tps: tps@24 {
>>               reg = <0x24>;
>>               compatible = "ti,tps65217";
>
> I'd like to see a '\n' here.
I will add a newline here.
>
>> -             backlight {
>> +             tps_bl: backlight {
>
> Same here.  Is this label used?
>
>> +                     compatible = "ti,tps65217-bl";
>>                       isel = <1>;  /* 1 - ISET1, 2 ISET2 */
>>                       fdim = <100>; /* TPS65217_BL_FDIM_100HZ */
>>                       default-brightness = <50>;
>
> --
> Lee Jones
> Linaro STMicroelectronics Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
> Follow Linaro: Facebook | Twitter | Blog

Regarding the labels: The backlight label could be used like the
following. I use it like this in my tests with the tilcdc panel driver
which has a backlight support.

    panel {
        backlight = <&tps_bl>;

        panel-info {
            ac-bias        = <255>;
            ac-bias-intrpt    = <0>;
            dma-burst-sz    = <16>;
            bpp        = <32>;
            fdd        = <0x80>;
            sync-edge    = <0>;
            sync-ctrl    = <1>;
            .
            .
            .

I'm not sure if there could be actual use for the pmic label, but I
thought if I add a label to backlight, I have to add one to the pmic
too to keep it similar.
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