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

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Date:   Tue, 13 Dec 2016 11:11:04 -0600
From:   Rob Herring <robh@...nel.org>
To:     Benjamin Gaignard <benjamin.gaignard@...aro.org>
Cc:     Lee Jones <lee.jones@...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 10:28 AM, Benjamin Gaignard
<benjamin.gaignard@...aro.org> wrote:
> 2016-12-13 16:57 GMT+01:00 Rob Herring <robh@...nel.org>:
>> 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.
>
> "timer" is already used in stm32 DT for clocksource node... It is also why
> I use "timers" for this.

That doesn't matter. They are at different levels in the hierarchy.

Rob