linux-kernel - Re: [PATCH v6 3/8] PWM: add pwm-stm32 DT bindings

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Date:   Tue, 13 Dec 2016 09:57:15 -0600
From:   Rob Herring <robh@...nel.org>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Linux PWM List <linux-pwm@...r.kernel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald <pmeerw@...erw.net>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Fabrice Gasnier <fabrice.gasnier@...com>,
        Gerald Baeza <gerald.baeza@...com>,
        Arnaud POULIQUEN <arnaud.pouliquen@...com>,
        Linus Walleij <linus.walleij@...aro.org>,
        "linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
        Benjamin Gaignard <benjamin.gaignard@...com>
Subject: Re: [PATCH v6 3/8] PWM: add pwm-stm32 DT bindings

On Tue, Dec 13, 2016 at 5:11 AM, Lee Jones <lee.jones@...aro.org> wrote:
> On Mon, 12 Dec 2016, Rob Herring wrote:
>
>> On Fri, Dec 09, 2016 at 03:15:14PM +0100, Benjamin Gaignard wrote:
>> > Define bindings for pwm-stm32
>> >
>> > version 6:
>> > - change st,breakinput parameter format to make it usuable on stm32f7 too.
>> >
>> > version 2:
>> > - use parameters instead of compatible of handle the hardware configuration
>> >
>> > Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...com>
>> > ---
>> >  .../devicetree/bindings/pwm/pwm-stm32.txt          | 33 ++++++++++++++++++++++
>> >  1 file changed, 33 insertions(+)
>> >  create mode 100644 Documentation/devicetree/bindings/pwm/pwm-stm32.txt
>> >
>> > diff --git a/Documentation/devicetree/bindings/pwm/pwm-stm32.txt b/Documentation/devicetree/bindings/pwm/pwm-stm32.txt
>> > new file mode 100644
>> > index 0000000..866f222
>> > --- /dev/null
>> > +++ b/Documentation/devicetree/bindings/pwm/pwm-stm32.txt
>> > @@ -0,0 +1,33 @@
>> > +STMicroelectronics STM32 Timers PWM bindings
>> > +
>> > +Must be a sub-node of an STM32 Timers device tree node.
>> > +See ../mfd/stm32-timers.txt for details about the parent node.
>> > +
>> > +Required parameters:
>> > +- compatible:              Must be "st,stm32-pwm".
>> > +- pinctrl-names:   Set to "default".
>> > +- pinctrl-0:               List of phandles pointing to pin configuration nodes for PWM module.
>> > +                   For Pinctrl properties see ../pinctrl/pinctrl-bindings.txt
>> > +
>> > +Optional parameters:
>> > +- st,breakinput:   Arrays of three u32 <index level filter> to describe break input configurations.
>> > +                   "index" indicates on which break input the configuration should be applied.
>> > +                   "level" gives the active level (0=low or 1=high) for this configuration.
>> > +                   "filter" gives the filtering value to be applied.
>> > +
>> > +Example:
>> > +   timers@...10000 {
>>
>> timer@...
>
> No, it should be timers.

Read the spec. "timer" is a generic node name. "timers" is not. How
many is not relevant.

> The 's' is intentional, since this parent (MFD) device houses 3
> different types of timers.  The "timer" node is a child of this one.