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

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Message-ID: <20141008104717.GG20647@lee--X1>
Date:	Wed, 8 Oct 2014 11:47:17 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Johannes Pointner <johannes.pointner@...il.com>
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

On Wed, 08 Oct 2014, Johannes Pointner wrote:

> 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>;
> >
> 
> 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.

No, not at all.  If it's not used, you should remove it.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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